Radio receiver with position locating means

Radio receiver with position locating means
5 54719A
USOO 6
United States Patent [191
[11] Patent Number:
Kunii
[45] Date of Patent:
[54]
RADIO RECEIVER WITH POSITION
LOCATING IVIEANS
[75]
Inventor;
Nobuyasu Kunii’ Tokyo’ Japan
‘
‘
5,654,719
Aug. 5, 1997
5,152,012
5,280,642
9/1992 Schwob ..... ..
1/1994 Hirata et a1. .
455/158.5
455/l86.l
5,393,713
2/1995 Schwob ......... ..
455/158.5
5,493,709
2/1996 Duckeck et a1. ................... .. 455/185.1
[73] Assignee: Clarion C0., Ltd., Toda, Japan
Primary Examiner—Gregory C. Issing
[21] Appl. No.: 407,777
[22] Filed:
Mar. 21, 1995
Attorney, Agent, or Firm—-Flynn, Thiel, Boutell, & Tanis,
RC
[57]
ABSTRACT
[30]
Foreign Applica?on Priority Data
A radio receiver capable of determining its geographic
position is disclosed. The radio receiver includes a control
M81’. 25, 1994
Japan .................................. .. 6-079333
unit
access to a storage unit
that contains a
[51]
Int. c1.6 ............................... .. G01S 3/02; H04B 1/18
number of Station records 42“, 42b, - - - Each Station record
[52]
US. Cl. ..................... .. 342/451- 342/457- 455/154.1’
’ ‘155/1584
Field of Search
342/451 457,
“mills data rePresentative 0f the cam“ frequency’ Pm
gram type a geographic location of a speci?c broadcast
station. When a listener Wants to determine his geographic
4155/1514’ 1541’ 1542‘ 158.4, 1851’ 1862’
location, he tunes the radio to a broadcast station. The carner
186.1
frequency and prog‘am type of the recelved station are
supplied to the control unit. The control unit matches the
[58]
56
Ref
[ ]
erences
C-t d
carrier frequency and program type of the received station
le
with the like data in the station records to ?nd a matched
U.S. PATENT DOCUMENTS
4 969,209 11/1990 Schwob
5,068,838
5,152,011
11/1991
Klausner et al. ..
broadcast station. The location of the matched broadcast
station is employed as the location of the radio receiver.
455,158
..... .. 455/51
9/1992 Schwob .............................. .. 455/158.5
14 Claims, 9 Drawing Sheets
INPUT
MEANs f 2
RECEIVED
[I
RADIO
WAVES
f3
RECE'VED
FIRST POSITION
INFORMATION
PRocglsgsimd uNIT
DETERM'N'NG
MEANS
STORAGE /
H
UNIT
INPUT _/2
MEANS é
I]
“335%?
RECE'VED
WAVES
SIGNAL
i RETR1IEVAL
Il
———- PROCESSING uNIT
f3
SECOND POSITION :
MEANS
INFORMATION
DETERMINING
l
l_
7
I
:
I
|
MEANS
_ _
_ _ _
_
STORAGE
_ _ _
_
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_ E
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UNIT
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RECEIVED
RADIO
RECEIVED
WAVES
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SIGNAL
__——" PROCESSING UNIT_|
{4
MEMORY
MEANS
5
PROCESSING TREJEAENS
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UNIT
MEMORY
UNIT
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INFORMATION 1
I
DETERMINING
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MEANS
:
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_____ ‘T‘
STORAGE
UNIT f
US. Patent
8:
.0
n_
_
Aug. 5, 1997
Sheet 2 of 9
5,654,719
US. Patent
’ Aug. 5, 1997
Sheet 3 of9
5,654,719
REcEIvEO SIGNAL PROCESSING UNIT
//
SOUND FIELD
/
/
MODE
i1
1
PROCESSING
UNIT
l4 /,F;UNI;R |
II
F I G- 2
3
$15
\
. I /
I
CONTROL UNIT
I
|3~/{* PLL I
I________|
I
I
STORAGE
UNIT
M
DISPLAY
UNIT
I '7
\ INPUT UNIT
I
MEMORY
UNIT
U.S. Patent
Aug. 5, 1997
Sheet 4 of 9
5,654,719
(START)
STATE
/
51
NAME INPUT
SEEK KEY IN?
NO
YES
52
V
SEEK
S3
DPERATIDN “J
Y
RECEPTION
J54
F I G. 3
57
CITY DATA /
DECISION
58
NO RELEVANT CITY DATA?
.
NO
f
DISPLAY DETERMINE-D
CITY DATA
END
5‘?
I
I
SI
0
DISPLAY "No
coRREsPoNDENcE"
US. Patent
Aug. 5, 1997
Sheet 5 0f 9
( START )
STATE
NAME INPUT
J51
5?.
YES
SEEK
/ 53
OPERATION
IPRESET CH MEMORYjf
5Z4
5Z5
PRESET
CH MEMORY FULL?
OR IS SEEK OPERATION
COMPLETE?
CH1 MEMORY
RECEPTION
SELECT PICKED
UP CITY DATA
TYPE KEY IN?
CITY NAME
DETERMINATION
528
END
W
FIG-.4
5,654,719
US. Patent
Aug. 5, 1997
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Sheet 7 of9
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FIG
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5,654,719
US. Patent
Aug. 5, 1997
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44
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Sheet 8 of 9
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US. Patent
Aug. 5, 1997
[44
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NEWS
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Sheet 9 of 9
1
SPRTS
ENTER RCVD
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54
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5,654,719
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5,654,719
1
2
RADIO RECEIVER WITH POSITION
LOCATING MEANS
station performs is held in a database (speci?cally, the
frequency, type of radio station, and a type indicator name,
FIELD oF THE INVENTION
for example, are stored in a memory device such as a ROM
or a PROM.) Based on this, the broadcast frequencies of
desired broadcasting stations are recorded in a preset
The present invention relates to a portable radio used to
receive broadcast signals, such as an automobile radio and,
memory, and when a program is to be received, the desired
more particularly, to a portable radio with an internal assem
program is received by successively reading them out (refer
bly capable of determining the radio’s geographic location
to Japanese Laid-open Patent Number Hl-ll7529
so that the radio can automatically tune to a nearby station
that broadcasts the type of program the listener wants to
(“broadcast receiver”)).
receive.
above mentioned Japanese Laid-open Patent Number
In the conventional broadcasting receiver disclosed in the
Hl-1l7529 (referred to as a receiver with an ID-LOGIC
BACKGROUND OF THE INVENTION
easy tuning of radio’s receiver to a station that broadcasts the
type of program the listener wants to hear. Some radios
employ scanners which automatically scan the airwaves
function), not only does the above mentioned database
contain data consisting of the broadcasting frequency and
the type, but also regional information indicating the geo~
graphic location of the broadcasting station is held as data.
This information. the geographic location of the broadcast
station, is important because in some parts of the world, such
until
strength.
theyThe
pick
received
up signals
signal of
is then
a preestablished
played so as to give the
ing stations which have the same frequency. Accordingly,
Many radios, especially radios found in cars and other
vehicles, include one or more sub-circuits to facilitate the
listener the opportunity to evaluate whether or not he wants
to listen to the broadcast program. If the listener does not
want to the listen to the broadcast program, he reactivates
the scanning circuit so that it locates a new signal which is
then played. This process is repeated until the listener
as in North America, there are a large number of broadcast
the data for the broadcast stations is ?rst grouped by state or
province, and then divided into broadcasting stations within
a state or province. It should be noted that examples of
ID-logic types include classical, jazz, public, country, news
25
locates a broadcast station that is transmitting a program he
wants to hear. Car radios can also be programmed with the
broadcast frequencies of a number of di?erent broadcast
stations. This allows the listener to automatically tune the
radio to the station he wants to listen to without having to
?rst scan the broadcast frequency spectrum.
Some station programmable radios include a number of
selection buttons equal to the number of stations to which
the radio can be programmed. Other programmable radios
include a single selection button and a display are provided,
and/or talk radio.
Next. in describing an example of the operation of the
above mentioned lD-logic function, (1) the listener speci?es
30
the point at which he is located (data for the state in which
one is located is input, and then data for the city which has
the broadcasting station one wishes to listen to is input (in
America, for example, there are many cases in which
broadcasting stations have been established concentrated in
particular cities, and therefore there is no certainty that there
will be a broadcasting station in the city which includes the
current position of the listener (receiver). In such cases, the
listener selects from a map the city which is nearest to the
and in which the preset broadcasting station codes (or
broadcasting station names) are displayed on the display by
continuously pressing the selection button. With these
radios, when the desired broadcasting station code is dis
city in which the listener (receiver) is currently located, and
sets this)). e.g., state selection: Nevada; city selection: Las
Vegas (2) After completing selection of the state and the city,
played the listener starts the reception operation by pressing
the listener performs the reception operation instruction by
a reception start button.
pressing a reception key, and the data corresponding to the
reception frequency of the broadcasting station are retrieved
from the ROM and the type is displayed. e.g., reception
These latter programmable radio receivers include radios
in which the broadcasting station frequencies are ?xedly set,
as in radio receivers used in countries with few broadcasting
stations (for example, Japan). Programmable radios have
also been provided employing a system in which the listener
can preset the broadcast frequencies of desired broadcasting
stations. These radios are typically used in countries in
which there are a large number of broadcasting stations (for
example, America).
45
lD-logic function can also search the broadcasting stations
by type, using the database.
With radio receivers which perform type searching using
50
the above mentioned ID-logic function, the listener must
?rst specify the current position (of the receiver), and it is
necessary to refer to a map, and input city (region) data.
Although it is troublesome to input such city (region) data
Listener prograrmnable radios are often supplied with a
scanning circuit. This allows the listener to scan the broad
cast frequency spectrum by pressing a search key which is
provided on the radio receiver, scanning is halted at received
frequencies of a ?xed strength. The listener then selects
whether or not to program the broadcast frequency, and
desired broadcast frequencies are successively selected and
frequency: 87.9 MHZ, type: popular music In addition, the
55
recorded in a preset memory. Then, in order to receive a
broadcast, the listener selects a desired broadcast station
whilst looking at a map, the operation to set the city data is
not particularly troublesome if the position of the receiver is
?xed, or is within the reception area of the speci?ed broad
casting station, in cases in which the position of the receiver
is variable.
However, if consideration is given to a radio receiver
installed in a vehicle, distances covered by the vehicle are
great, particularly in countries such as America which have
from amongst the programmed stations, and starts the recep
a car-based society. Thus there are many cases in which the
tion operation, by continuously pressing a selection button.
In North American radio broadcasting stations, the type of
program which is broadcast (for example music programs
reception area of broadcast radio waves of the speci?ed
broadcasting station is exceeded, and in some cases it is
such as jazz, or news) is ?xed for each broadcasting station.
There are receivers which are con?gured such that data
indicating which type of broadcast a particular broadcasting
65
necessary to reset the city data frequently.
When vacationing in a car, for example, if a desired type
of radio broadcast is being listened to using the lD-logic
function, then the vehicle will become separated from the
5,654,719
3
4
position of the initially speci?ed broadcasting station, due to
received signal processing on the broadcast radio waves and
regenerates the broadcast program, wherein said radio
receiver comprises an input means 2 for inputting classi?
cation selection information for selecting classi?cation
information for a broadcast program which has been regen
erated by means of the above mentioned received signal
the movement of the vehicle. As the limit of reception of the
broadcast radio waves is approached, it will become impos
sible to receive the broadcast radio waves, and the listener
will perform a seek operation (radio wave search operation
to receive broadcast radio waves) in order to listen to the
desired type of broadcast, with the intention of listening to
processing unit; and a ?rst position information determining
a corresponding type of broadcast which can be received.
But, even if the receiver is tuned to the frequency of the type
means 3 which determines the broadcasting station position
information corresponding to the current position of the
radio receiver based on the above mentioned input classi?
cation selection information and the frequency of the broad
of broadcast which the listener wishes to receive, there is the
problem that the city data (in other words the broadcasting
station) will be di?erent. It will thus be impossible to listen
to the corresponding type of broadcast, and in order to listen
to the corresponding type of broadcast it will be necessary
cast radio waves of the regenerated broadcast program.
As shown in FIG. 1(b), the radio receiver of a second
embodiment of this invention is a radio receiver comprises:
a storage unit 11 which stores a plurality of units broadcast
to set the new city data (in other words the data for the
nearest city in which the desired type of broadcasting station
has been established, in the region through which the vehicle
is currently passing).
In order to solve the above mentioned problem,v the
current position is corrected by the ID-logic function at ?xed
20
ing station data, where one unit of broadcasting station data
comprises includes classi?cation data comprising the broad
cast frequency and the broadcast program and broadcasting
station position information; a received signal processing
unit 1 which performs received signal processing on the
time intervals or ?xed distances. In this case the correction
broadcast radio waves and regenerates the broadcast
is performed using, for example, direction keys indicating
program, wherein said radio receiver comprises an input
means 2 for inputting classi?cation selection information for
selecting classi?cation information for a broadcast program
which has been regenerated by means of the above men
tioned received signal processing unit; a retrieval means 6
which, when the above mentioned classi?cation selection
information has been input, retrieves the plurality of broad
casting station data from the above mentioned storage means
the direction in which one is currently moving from the
initially set position (keys provided on the receiver indicat
ing N (north), S (south), E (east) W (west).
25
However, radio receivers are not the only sound sources
(sound systems) installed in vehicles, and CDs and cassette
tape devices are also installed. Thus the listener will not
always listen continuously to radio programs only, but may
listen to a program, occasionally listen to music or the like 30 and based on said classi?cation selection information and
the frequency of the broadcast radio waves of the broadcast
recorded on a CD or cassette tape, and then return to the
radio program.
Thus if, for example, the vehicle is started from the
initially set position (without a radio broadcast being lis
tened to) whilst the listener is listening to music or the like
recorded on a CD, and then the listener operates the lD-logic
program which has been regenerated, and picks out the
corresponding broadcasting station data; and a second posi
tion information determining means 7 which determines the
35
function in order to listen to a radio program after the vehicle
has traveled for some time, there is the problem that, since
the set position and the current position are different, the
lD-logic function does not function correctly. Further, there
is the problem that the current position after traveling is not
adjacent to the initially input position. Thus even if direction
key operation is performed in order to correct the position,
40
a storage unit 11 which stores a plurality of units of
as described above, it is not possible to correct the position. 45
In such cases there is the inconvenience that it is neces
sary to reset the position information (city, region data)
50
processing unit 1 has been completed, causes a received
55
looking at a map.
In order to achieve the above mentioned aims, the radio
receiver of a ?rst embodiment of this invention, as shown in
FIG. 1(a), is a radio receiver comprises: a storage unit 11
which stores a plurality of units of broadcasting station data,
where one unit of broadcasting station data includes classi
?cation data comprising the broadcast frequency and the
broadcast program, and broadcasting station position infor
mation; a received signal processing unit 1 which performs
means 4 which records successively in the memory unit the
frequencies of broadcast radio waves received by means of
the above-mentioned received signal processing unit 1; a
reception control means 5 which, after the received signal
processing operation in the above mentioned received signal
The present invention takes account of the above men
tioned problems and inconvenience. The present invention
aims to provide a radio receiver which permits reception of
a desired broadcast program, by presetting the broadcast
frequency of the desired broadcasting station in the receiver,
wherein the radio receiver permits setting of the current
position information by means of a simple operation without
broadcasting station data, where one unit of broadcasting
station data including classi?cation data comprising the
broadcast frequency and the broadcast program, and broad
casting station position information; a received signal pro
cessing unit 1 which performs received signal processing on
the broadcast radio waves; a memory unit 12 with a memory
whilst looking at a map. Moreover, if there is no map, it may
not be possible to set the information appropriately.
SUMMARY OF THE INVENTION
selection of the broadcasting station position information
corresponding to the current position of the radio receiver
based on the broadcasting station data which has been
picked out by the above mentioned retrieval means 6.
As shown in FIG. 1(a), the radio receiver of a third
embodiment of this invention is a radio receiver comprises:
signal processing operation to be performed on the broadcast
radio waves, in the above mentioned received signal pro
cessing unit, for each broadcast radio wave frequency which
has been recorded in the above mentioned memory unit 4; an
input means 2 for inputting classi?cation selection infonna
tion for selecting classi?cation information for each broad
cast program which has been regenerated by means of the
above mentioned received signal processing unit; a retrieval
means 6 which, when the above mentioned classi?cation
65
selection information has been input, retrieves the plurality
of broadcasting station data in the above mentioned storage
unit, based on the frequency of the received signal radio
waves and said classi?cation selection infonnation, and
picks out the corresponding broadcasting station data; and a
5,654,719
5
6
third position information determining means 8 which
selects and detennines the broadcasting station position
information corresponding to the current position of the
radio receiver, based on the broadcasting station data which
has been picked out by the above mentioned retrieval means
FIG. 3 is a ?owchart showing one embodiment of opera
tion of the position locating means of the radio receiver of
this invention.
FIG. 4 is a ?owchart showing an alternative embodiment
of the position locating means of the radio receiver of this
invention.
6.
In the radio receiver of the ?rst embodiment of the
invention intended to achieve the above mentioned
objectives, the classi?cation or program format information
of a received regenerated broadcast program is entered by
means of the input classi?cation selection information. The
position information of broadcasting stations which can be
received is then obtained by means of the ?rst position
information determining means, based on the classi?cation
FIG. 5 is an example of a map.
10
display-data enn'y panel that can be employed with the
position locating means of the radio receiver of this inven
tion.
selection information and the frequency of the broadcast
radio waves of the regenerated broadcast program, and the
DETAILED DESCRIPTION
FIG. 2 is a block diagram showing an example of the
position information of the broadcasting station which is to
be selected is determined.
In the radio receiver of the second embodiment of this
invention, the classi?cation information of the regenerated
broadcast program is entered by means of the input classi
20
?cation selection information. The plurality of broadcasting
station data in the storage unit 11 are retrieved by means of
the retrieval means 6, based on the classi?cation selection
information and the frequency of the broadcast radio waves
25
invention, ?rstly the frequency values of broadcasting radio
waves which can be received are successively recorded in
the memory unit 12 by means of the memory means 4. The
recorded frequency values of the broadcast radio waves are
then successively read out from the memory unit 12 by
means of the reception control means 5, and received signal
processing operations are performed on the broadcast radio
waves in the received signal processing unit I for each
frequency. r[he classi?cation information of the regenerated
broadcast program is then input by means of the input means
2, and when the classi?cation selection information has been
input, the plurality of broadcasting station data in the storage
unit 11 are retrieved by means of the retrieval means 6, based
on the classi?cation selection information and the frequency
of the received radio waves, the corresponding broadcasting
station data are picked out. The position information of the
broadcasting station corresponding to the current position of
the radio receiver is selected and determined by means of the
third position information determining means 7.
Consequently, according to the ?rst through third embodi
con?guration of one embodiment of a radio receiver to
which the present invention can be applied, where 11 is a
storage unit, 12 is a temporary memory unit which tempo
rarily records data and the like, 13 and 14 are received signal
processing units (13 is a PLL circuit, 14 is a tuning circuit),
15 is a control unit, 16 is a display unit, 17 is an input unit
and 18 is a sound ?eld mode processing unit.
A writable ROM such as a PROM is used as the storage
of the regenerated broadcast program and the corresponding
broadcasting station data are picked out. The position infor
mation of the broadcasting station corresponding to the
current position of the radio receiver is selected and deter
mined by means of the second position information deter
mining means 7, based on the picked out broadcasting
station data.
In the radio receiver of ?re third embodiment of this
FIG. 6 is a partial depiction of the station ?le for a
particular state that is contained in memory of the position
locating means of the radio receiver of this invention.
FIGS. 7A and 7B depict the face of an intelligent data
unit 11, and broadcasting station data groups (broadcasting
station ?les), in which one unit record comprises data
comprising broadcasting frequency and speci?c generic
30
information, divided by broadcasting station location (state,
city) and type, and programs, for example, are stored in
advance in the storage unit 11. Further, a channel memory
area is maintained in the storage unit 11, and the desired
broadcast frequencies (preset data) obtained by means of the
35
present invention are stored therein.
FIG. 6 illustrates the partial contents of a station ?le 40 a
particular geographic region, in this case the State of Michi
gan. The station ?le 40 contains a number of individual
records 42a and 42b each of which includes data about a
particular broadcast that broadcasts in the state. Speci?cally,
each record 42a and 42b includes a location ?eld 44a and
44b, respectively, a frequency ?eld, 46a and 46b,
respectively, and a program type ?eld, 48a and 48b, respec
tively. The location ?elds 44a and 44b contain indications of
45
the cities in which the associated stations are located.
Frequency ?elds 46a and 46b contain data indicating the
carrier frequency over which the associated station broad
cast their signals. Program type ?elds 48a and 48b contain
codes that indicate the broadcast format of the station. For
example a program type ?eld may indicate that a station is
a news station, a pop radio station, a public broadcasting
station, a sports station, a talk radio station or a classical
radio station.
Memory for temporary recording, such as RAM, is used
ments of this invention inventions, the radio receiver can 55 as the memory unit 12, and data updates (renewal,
automatically determine the position of the received broad
casting stations in order to determine its own current posi
tion. Thus the listener to a broadcast program can set the
current position information by means of a simple operation
without looking at a map.
BRIEF DESCRIPTION OF THE DRAWINGS
FIGS. 1(a), 1(b) and 1(0) are block diagrams that illustrate
alterations) and type data are temporarily recorded therein.
Further, a preset channel working area is maintained in the
memory unit 12.
The received signal processing unit 1 receives broadcast
radio waves and extracts the baseband signal from the
modulated wave. It should be noted that a tuner pack, for
example, is used as the tuning circuit 14, and during preset,
scanning is performed in the range which has the desired
the basic functional elements of the radio receiver of this
type of broadcast frequency. Further, during reception, the
invention.
65 preset frequency radio waves are selected and received, and
FIG. 2 is a block diagram of the elements of the radio
the baseband signal is extracted from the received modu
receiver of this invention.
lated wave by the PLL circuit 13.
5,654,719
7
8
A CPU such as a microcomputer is used as the control unit
large area, such as America or Russia, this will be the state
name, and in the countries of the EC it will be the country
15, and the control unit 15 controls the operation of the
name) alphabetically, in code or using the display panel 60
whole of the receiver (each component), and performs
frequency selection control (refer to FIG. 3 and FIG. 4,
in order to specify the desired type of broadcasting station.
This speci?cation of the state name (or country name) is
hereinbelow) based on the present invention.
simple, and does not require one to look at a map. Further,
The display unit 16 displays the broadcasting station
location code (or location name), the type code (or type
name) and the frequency, for example, during presetting or
even if reference is made to a map, the state name is
typically tends be clearly marked, as shown in FIG. 5 (in
reception, and also displays to the user an input guide for
FIG. 5 the state boundaries are shown by thick lines, and
operating the receiver, for example.
rectangles comprising broken lines).
cities which have broadcasting stations are demarcated by
A key matrix is provided in the input unit 17, and the user
keys in instructions from the input unit 17 such as broad
In step S2, the control unit 15 monitors whether or not the
seek key of the input unit 17 has been pressed. When it
detects that the seek key has been pressed, the process
moves to step S3. If the seek key is not pressed, then the seek
casting station presetting, and reception instructions. Keys
which are provided include, for example, a seek key for
instructing the receiver to begin the seek operation, a posi
tion con?rm key, alphabetical keys for inputting names and
key input waiting operation is repeated until the seek key is
pressed.
the like, a news key, a jazz key, a pops key, . . . , as type
In step S3, the control unit 15 issues a broadcast radio
selection keys, and a CH key, used as a reception channel
wave reception command to the received signal processing
unit 1. The received signal processing unit 1 forms a seek
operation in the region which has broadcast frequencies, and
the received frequency values of a ?xed strength obtained
thereby are outputed to the control unit.
In step S4, the control unit 15 commands the received
signal processing unit 1 to execute received signal
processing, and provides the frequency values which are to
be received.
The received signal processing unit selects and receives
the corresponding frequency broadcast waves by means of
the tuning circuit 14, based on the provided frequency
values, and the baseband signal is extracted from the
selection key.
FIG. 7A illustrates a data input device 60 that may
20
alternatively be incorporated into the receiving system of
this invention. The data input device 60 includes a center
located display panel 62 on which a number of lines of
alphanumeric data may be displayed Display panel 62 may,
for include an assembly of selectively activated light emit
25
ting diodes or may take the form of a ?at panel electrolu
minescent display. A set of data entry keys 64 are located
around the display panel. In the depicted version of the
invention four data entry keys 64 are located above the
display panel 62 and four data entry keys are located below
the display panel. The message presented on the display
panel is controlled by the microcontroller 15; the data
supplied by the actuation of the display keys 64 is forwarded
30
received modulated wave in the PLL circuit 13. The base
band signal is regenerated as sounds (voice) provided to the
sound ?eld mode processing unit 18.
to the control unit 15.
The instructions presented on the display panel 62 and the
data entered though keys 64 are a function of what point the
listener is in during the process of operating the system in
order to determine ?rst the location of the receiver and, then
to select the type of radio station to which he wants to listen.
For example, as illustrated in FIG. 7A, during the
part
35
40
of the locating process, when the listener is directed to enter
state location, the center line of the display panel 62 will
include the message: ENTER STATE\PROV. The top line of
In step S5, the control unit 15 monitors whether or not the
user, upon listening to the contents of the regenerated
broadcasts, has pressed a type selection key such as provided
on the input unit 17 or, as depicted by FIG. 7B, by display
panel 60, indicating the contents of the broadcast. If the
control unit 15 detects that a type selection key has been
pressed then it outputs a code indicating the type to the
memory unit 12 and records the corresponding frequency
Value and type code in the preset channel working area. If a
type selection key has not been pressed then the type
the display panel lists the following states and province
immediately under the upper data entry keys 64: MICH
ONI‘ OHIO 1ND. The bottom line of the display panel 62
selection key input waiting operation is repeated until a type
selection key is pressed.
For example, if the sought frequency is 87.1 MHZ, and if
will indicate the other nearby states adjacent the lower data
entry keys 64 with the message: ILL WIS MIN.
jazz, then the jazz key is pressed.
The sound ?eld mode processing unit 18 consists of a
DSP (digital signal processor) and it processes the sound
upon listening to the contents of the broadcast its type is
50
?eld mode when a music program is being received
FIG. 3 is a ?owchart showing one embodiment of the
operation of the control unit 15 during input of radio receiver
position information (city data, region data) based on the
present invention.
In step S1, the control unit 15 performs the command to
display a state data input guide (for example “Input the state
name alphabetically”) on the display unit 16 in order to
prompt the listener to input the state data (in this case the
state name). Thus when the listener has input the state name
from the input unit 17, the state name data is output to the
memory unit 12 which is a temporary recording area, and is
recorded in the memory unit 12, and the process then moves
to step S2.
Here, since the lD-logic function is being used, it is
necessary ?rstly to input the state data (in a country with a
In step 86, the control unit 15 commands the display unit
16 to display a con?rmation input guide (for example “Press
the position con?rm key to con?rm the position”) to the
listener in order to determine whether or not to perform
55
position con?rmation processing step S7, when a certain
type key has been input.
The control unit 15 monitors whether or not the listener
has pressed the position con?rm key. If it detects that the
position con?rm key has been pressed, then the process
moves to step S7. If the position con?rm key has not been
pressed even after a ?xed time has elapsed, the process
returns to step S3 and the processes of steps S3 through S6
are repeated. It should be noted that the start of the position
con?rmation guide display may be moved to step S6 if the
number of types input in step S5 is counted and exceeds a
65
?xed number.
In step S7, the broadcasting station ?le in the storage unit
11 is retrieved, using the state data, frequency and type data
5,654,719
9
10
obtained by means of the above mentioned steps S1 through
S5 as a key, and the city data (city name) for all of the
relevant broadcasting station data which have been retrieved
After the seek operation has been completed, in step S26
the control unit 15 commands the received signal processing
unit 1 to execute received signal processing. At this time, the
control unit 15 provides the frequency values which are
are picked out.
Next, in step S8, it is detennined whether or not any city
data have been picked out (in other words whether or not any
of the retrieved broadcasting station data correspond to the
recorded in the preset channel working area of the memory
unit 12 to the received signal processing unit 1.
The received signal processing unit 1 selects and receives
the broadcast radio waves of the corresponding frequency by
frequency and program type of the scanned station.) If the
station ?le 60 does not include any station record 42a or 42b
for the scanned station, then a message to this effect is 10 means of the tuner circuit 13, based on the received fre
quency value. The baseband signal is extracted from the
displayed on the display unit 16 in step S10 (for example
received modulated wave by the PLL circuit 14. The base
band signal is generated as sound (voice) output to the sound
?eld mode processing unit 18.
In step S27, the control unit 15 monitors whether or not
the user. upon listening to the contents of the regenerated
‘There is no such type of broadcasting station in the present
area”).
If a station record 42a or 42b is found with a carrier
frequency and program format that corresponds to the
scanned station, the city contained in the associated location
?led 48a or 48b is determined to be the city corresponding
broadcasts, has pressed a type selection key (provided in the
input unit 17 or on the input device 60) indicating the
to the current position of the radio receiver, and the name of
the city is displayed on the display unit 16 in step S9.
In some versions of the invention, the city displayed may
not be the closest actual city, but the closest city with a large
number of broadcasting stations. If, for example, Nevada is
broadcast format of the received station. If it detects that a
input as the state data and the names of cities in which
type selection key has been pressed, then it outputs a code
indicating the type to the memory unit 12, the type code is
recorded in the address corresponding to the corresponding
frequency value in the preset channel working area, and the
broadcasting stations with the following frequencies and
process moves to step S28.
types have been established are obtained, then the city which
is determined to be the current position will be Las Vegas.
which has the most broadcasting stations.
It should be noted that in the ?owchart of FIG. 3, steps S2
through S4 correspond to the operation of the received
signal processing unit 1. Steps S5 and S6 correspond to the
input means. Step S7 corresponds to the retrieval means 6.
25
selection key input waiting operation is repeated until a type
selection key is pressed.
In steps S28 and S29, the processes of the above men
Steps S8 through S10 correspond to the second position
information determining means 7. Further, steps S7 through
S10 correspond to the ?rst position information determining
means 3.
FIG. 4 is a ?owchart showing another embodiment of the
35
operation of the control unit 15 during input of radio receiver
position information (city data, region data) based on the
present invention. '
The operation of steps S1 and S2 in FIG. 4 are the same
as in FIG. 3, described above.
In step S3, the control unit 15 issues a command to the
received signal processing unit to receive broadcast radio
waves, and the received signal processing unit 1 succes
sively performs the seek operation in the broadcasting
If, for example, the frequency is 87.9 MHz, and upon
hearing the contents of the broadcast its type is pop music,
then the pops key is pressed.
If a type selection key is not pressed then the type
tioned steps S26 and S27 are repeated for all of the frequen
cies recorded in the preset channel working area. The station
?le 40 for the selected state in the storage unit 11 is retrieved,
using the resulting state data, frequency and type data as a
key, and the city data (city name) for all of the retrieved
corresponding broadcasting station data are picked out.
Next, in steps S30 and S31, the control unit 15 establishes
the geographic location of the radio receiver. This determi
nation is made by correlating the station frequency and
broadcast format data for the received station stored in the
channel working area with the data contained in the station
?le 40. The control unit 15 establishes the location of the
radio by determining the location with the highest correla
frequency range, and received signal frequency values of a
tion of the data for the received broadcasting stations with
the data stored in the station ?le 40. Steps 30 and 31 are
?xed strength which are obtained are output successively to
the control unit 15. When the control unit 15 receives
performed by ?rst determining for each location the number
received signal frequency values of a ?xed strength, it
outputs these frequency values to the memory unit 12, where
45
50
they are successively recorded in the preset channel area
(CHI) maintained in the memory unit 12.
In step S24, each time the control unit 15 receives a
received signal frequency value of a ?xed strength, it outputs
the frequency value to the memory unit 12, and successively
stores the values in the preset channel working area provided
highest number of agreements. If two or more narrow
geographic areas have the same, highest number of stored
station-received station agreements, the determination is
made by determining for which narrow geographic region
55
in the memory unit 12.
In step S25, the control unit 15 checks the capacity of the
preset channel working area. When the capacity is full or the
seek operation has ?nished, the process moves to step S26.
In all other cases the operations of steps S3 through S25 are
repeated It should be noted that the preset channel Working
area capacity check counts the number of frequencies which
are recorded, and it should compare the capacity obtained by
multiplying the predetermined data length (byte) of the
frequency by the count value, with the preset channel
working area capacity.
of stations for which the received broadcast station fre
quency and type agree with the records 42 stored in the
station. Initially, the determination is made based on the
there is the highest correlation of received stations to stored
stations.
It should be noted that in the ?owchart of FIG. 4, steps S2
and S3 correspond to the received signal processing unit 1.
Steps S24 and S25 correspond to the memory means 4. Step
S26 corresponds to the reception control means 5. Step S27
corresponds to the input means 2. Steps S28 and S29
correspond to the retrieval means 6. Steps S30 and S31
correspond to the third position information determining
65
means. Further, steps S28 through S31 correspond to the ?rst
position information determining means 3.
By means of the embodiments of the operation of the
control unit 15 described above, it is possible to have a
5,654,719
11
12
construction such that after the city data is determined, the
city name is input ?om the input unit 17 as city data, and it
is also possible to have a construction such that the deter
station ?les 60 that is in the form of a cartridge type
periodic replacement of the storage unit 11 so that storage
mined city data are automatically speci?ed.
After specifying the city data, the broadcasting station ?le
in the storage unit 11 is retrieved using the state data, the city
unit will always contain a set of station ?les 60 that list the
current program formats of the broadcast stations. This
adjusts for the fact that the program formats for individual
data and the type data as a key, then the corresponding
broadcasting station data should be recorded in the channel
memory.
After completing the preset operation, the user can listen
replaceable erasable/programmable ROM. This allows the
10
to a program simply by pressing the CH key. Further, if the
user has tired of the program which he is currently listening
to he can change to successive broadcasting stations simply
frequencies corresponding to each type is maintained,
according to the memory capacity of the memory unit 12,
and may also be one in which a preset memory which presets
a number of broadcast frequencies corresponding to a single
by pressing the CH key.
The control unit 15 can also be con?gured so that after the
type is maintained, and each time the type key is pressed the
preset memory is rewritten and the broadcast frequencies
corresponding to the said type are recorded.
location of the receiver is determined, the city data, that, by
reference to the station ?le 60, the station records 42a, 42b,
. . . for the nearby broadcasting stations that the radio can be
received will be pulled up. Then, based on the data contained
in the program ?elds 48a, 48b, . . . for the retrieved stations,
broadcast stations periodically change and new broadcast
stations occasionally start to broadcast.
It should be noted that the method for presetting the types
and broadcasting frequencies may also be one in which a
memory area (preset memory) for recording the broadcast
The system can also be con?gured so that once the
20
received signal fades below a given level, the reception
processing unit 5 or control unit 15 directs the received
the control unit may generate a message on the display unit
60 asking the listener to indicate the format of the broadcast
he wants to receive. For example, display panel 62 may
signal processing unit 1 to switch to another frequency. The
position information determining means or control unit then
updates the position of the radio based on a review of the
present the following instruction, ENTER PROGRAM
25 frequency of the new broadcast station to the frequencies of
CHOICE, with the following choices, NEWS POP SPRTS
the broadcast stations stored as records 42. In order to
CLSCL. Once the listener has made his choice, control unit
perform this position information renewal, multiple new
15 will command the received signal processing unit 1 to
broadcast stations may be tuned in by received signal
tune to the frequency of the selected choice.
processing unit 1; once the frequencies of these stations are
In some densely populated regions, there may be a 30 stored, they are correlated with the frequencies for the
number of broadcast stations that broadcast the same basic
broadcast stations stored in records 42 in order to determine
type of program. In these regions, the control unit 15 may
the new location of the radio.
inform the listener that there are multiple broadcast stations
The position information determining means may further
playing the same type of programming by presenting the
message as part of the program selection process. For
example, if the radio receiver is in a location where it can
receive three pop radio stations, control unit 15 may gen
erate the message as POPl POP2 POP3 on display panel 62
as part of the station select process in order to inform the
listener of this fact.
The initial geographic positioning of the invention may
also be adjusted for use in areas with large populations. For
example, if the listener initially indicates that he is in a state
with a large population and numerous broadcast stations, the
control unit may direct the user to further identify the region
in which he is located before beginning the detailed city
determination. For example, if the listener indicates that he
is in Florida, the control unit 15 may present the message
N.FLA or S.FLA? The control unit 15 will then wait for the
listener to indicate what part of the state he is in before
beginning the city determination. In this version of the
invention, the storage unit 11 will contain station ?les 60 that
35
retrieved from storage unit 11 is recognized as a condition in
which the position information determining means has made
45
Although a particular preferred embodiment of the inven- 7
50
disclosed apparatus, including the rearrangement of parts, lie
55
indicated he was located. Then, when the city determination
process is started, the control unit 15 will direct the listener
to indicate if he is in the state in which he was located or the 60
nearby states and provinces. For example, if the listener last
indicated that he was in Michigan, the control unit 15 will
direct the input device to ask the listener if he is in Michigan
or Indiana, Ohio, Ontario, Wisconsin, or Illinois which are
radio receiver of this invention with a storage unit 11 for the
tion has been disclosed in detail for illustrative purposes, it
will be recognized that variations or modi?cations of the
within the scope of the present invention.
radio is located. A space can be set aside in the memory unit
12 to hold an indication of the state in which the listener last
the closest nearby states and province.
It may also be desirable to provide embodiments of the
the correct location determination. A low correlation condi
tion is recognized as an indication that the position of the
radio receiver was incorrectly determined; a message to this
effect may be presented on display panel 62.
list broadcast stations by geographic sub-regions.
The control unit 15 may also be con?gured to simplify the
effort required to initially indicate the state in which the
include a submodule for verifying it has correctly identify
ing the location of the radio. This module operates ?rst
determining the frequencies of the broadcast programs
received by the received signal processing unit 1. The
frequencies of the received programs are compared with the
frequencies contained in the stored station records 42 for the
stations in the determined location. A correlation between
the frequencies of the received stations and the frequencies
of the nearby stations as indicated by the records 42
65
The embodiments of the invention in which an exclusive
property or privilege is claimed are de?ned as follows:
1. A radio receiver for receiving broadcast radio waves
transmitted by a plurality of broadcast stations which carry
broadcast programs, each broadcast program being a par
ticular type of broadcast program, comprising:
a storage unit which stores a plurality of units of broad
casting station data, where each said unit includes data
for one broadcasting station, said data including clas
si?cation data comprising the broadcast frequency at
which the broadcast station transmits radio waves, the
type of broadcast program transmitted by the broadcast
station and position information for the broadcast sta
tion;
5,654,719
13
14
a received signal processing unit for receiving radio
reception of the preset station is detected, transfers operation
waves over a range of frequencies which performs
to the second means.
received signal processing on the broadcast radio
6. The radio receiver of claim 1, fm'ther including:
waves received at one frequency from a broadcast
a veri?cation means which, when the current position
station and regenerates the broadcast program;
input means for inputting an indication of the type of
broadcast program which has been regenerated by said
information has been speci?ed by said position infor
mation determining means determines whether or not
said current position information is correct by directing
said received signal processing unit to perform said
received signal processing on the broadcast radio
received signal processing unit; and
position information determining means connected to said
storage unit for retrieving said units of broadcasting
station data, to said received signal processing unit for
receiving an indication of the frequency of the received
10
received and by comparing the broadcast frequencies of
broadcast radio waves and to said input means for
receiving the indication of the type of broadcast pro
gram regenerated by said received signal processing
waves throughout a range of frequencies and by deter
mining at which frequencies broadcast programs are
15
unit which determines the position corresponding to the
the broadcast programs received by said received signal
processing unit with broadcast frequencies of the
broadcasting station data at the position corresponding
to the current position information, and a noti?cation
current position of the radio receiver based on the
indication of the type of the broadcast program which
means which performs a noti?cation based on the
results of said comparison.
has been regenerated, the frequency of the broadcast
7. A radio receiver for receiving broadcast radio waves
radio waves of the regenerated broadcast program and 20 transmitted by a plurality of broadcast stations which carry
said data contained in said units of broadcasting station
broadcast programs, each broadcast program being a par
data.
ticular type of broadcast program, comprising:
2. The radio receiver of claim 1, further including:
a storage unit which stores a plurality of units of broad
a position information renewal means for updating the
casting station data, each said unit of data including
position information of the broadcasting station corre 25
classi?cation data comprising the broadcast frequency
sponding to the above mentioned speci?ed current
at which the broadcast station transmits broadcast radio
position of the radio receiver wherein, said position
waves, the type of the broadcast program transmitted
information renewal means comprises: a ?rst means
which monitors the state of the received signal of the
broadcast frequency during reception; a second means
which, when a degradation of the received signal state
of the received broadcast frequency is detected by said
30
waves over a range of frequencies which performs
received signal processing on the broadcast radio
?rst means, executes a broadcast radio wave retrieval
operation to cause said received signal processing unit
to perform said received signal processing on broadcast
waves and regenerates the broadcast program;
35
radio waves at a new, broadcast frequency; and a third
retrieval means which, when an indication of the type of
broadcast program has been input, retrieves said units
of broadcasting station data from said storage means
and, based on the inputted type of broadcast program
and the frequency of the broadcast radio waves of the
broadcast program which has been regenerated, selects
broadcast frequency detected by said second means,
with the broadcast frequency of the broadcasting sta
tion data said storage unit.
3. The radio receiver as claimed in claim 2, wherein said
second means of said position information renewal means is
con?gured to repeatedly execute a prescribed number of
45
unit to perfonn said received signal processing so as to
determine the broadcast frequencies for a plurality of broad
cast stations, and the third means rewrites said position
information based on the result of a comparison of the
plurality of broadcast frequencies obtained by means of the
determination of new broadcast frequencies by second
means with the broadcast frequencies of the broadcasting
station data in said storage unit.
input means for inputting an indication of the type of
broadcast program which has been regenerated by said
received signal processing unit;
means which updates the position of broadcast station
information based on the result of comparing the new
times said process of causing said received signal processing
by the broadcast station, and position information for
the broadcast station;
a received signal processing unit for receiving radio
50
a particular unit of broadcasting station data; and
position information determining means which deter
mines the broadcasting station position information
corresponding to the current position of the radio
receiver, based on said unit of broadcasting station data
which has been selected by said retrieval means.
8. A radio receiver for receiving broadcast radio waves
transmitted by a plurality of broadcast stations which carry
broadcast programs, each broadcast program being a par
ticular type of broadcast program comprising:
4. The radio receiver as claimed in claim 2, wherein said
a storage unit which stores a plurality of units of broad
position information renewal means includes a fourth means 55
casting station data, where each said unit of data
comprises the broadcast frequency at which the broad
cast station transmits broadcast radio waves, the type of
the broadcast program, and broadcasting station posi
tion information;
a received signal processing unit which performs an initial
received signal processing operation on the broadcast
that, when a degradation of the state of the received signal
of the received broadcast frequency is detected by the above
mentioned ?rst means, executes reception of a preset station
and monitors the state of reception thereof, and if degrada
tion of the reception of the preset station is detected,
transfers operation to the second means.
5. The radio receiver as claimed in claim 3, wherein said
60
radio waves, a memory unit and a memory means
which records successively in the memory unit the
frequencies of broadcast radio waves received by said
position information renewal means includes a fourth means
that, when a degradation of the state of the received signal
of the received broadcast frequency is detected by said ?rst
means, executes reception of a preset station and monitors
the state of reception thereof, and if degradation of the
65
received signal processing unit;
reception control means which, after the
received
signal processing operation of said received signal
5,654,719
15
16
processing unit has been completed, causes a second
operations; reception control means which, after said initial
received signal processing operation to be performed
set of received signal processing operations performed by
said received signal processing unit has been completed,
on the broadcast radio waves by said received signal
processing unit for a plurality of broadcast radio wave
causes a second set of received signal processing operations
to be performed on the broadcast radio waves by said
received signal processing unit for a plurality of the broad
cast radio wave frequencies which have been recorded in
said memory unit, wherein during said second set of
received signal processing operations, an indication of the
frequencies which have been recorded in said memory
unit;
input means for inputting an indication of the types of
broadcast programs which have been regenerated by
means of said received signal processing unit;
retrieval means which, when the indications of the types
of broadcast programs have been input, retrieves said
10
broadcast radio wave frequency; and a retrieval means
which, when said indications of the types of broadcast
units of broadcasting station data in said storage unit,
and based on the frequencies of the received signal
radio waves and said input indications of the types of
broadcast programs, selects the corresponding units of
broadcasting station data; and
15
mines the corresponding broadcasting station data, and the
broadcasting station position information corresponding to
a position information determining means which deter
mines the broadcasting station position information
particular type of broadcast program comprising:
20
12. A radio receiver for receiving broadcast radio waves
from a plurality of diiferent broadcast stations that transmit
broadcast programs, each broadcast program being a par
25
ticular type of broadcast program, comprising:
a storage unit which stores a plurality of units of broad
casting station data, where each said unit includes
classi?cation data comprising the broadcast frequency
casting station data, where each said unit of broadcast
ing station data includes classi?cation data comprising
the broadcast frequency at which the broadcast station
transmits broadcast radio waves, the type of the broad
cast program, and broadcasting station position infor
for a broadcast radio program, the type of broadcast
program, and position information indicating the posi
mation;
a received signal processing unit which performs received
35
signal processing unit, and selects the position infor
tion of the broadcast station transmitting the broadcast
program;
a received signal processing unit which performs received
signal processing on the broadcast radio waves and
regenerates the broadcast programs;
a position information determining means for determining
the current position of the radio receiver, based on the
received broadcast radio programs, said position infor
mation determining means being provided with an
input means for inputting selection information for
indicating a ?rst, wide geographic area in which the
radio receiver is located and an indication of the type of
broadcast program that is regenerated by said received
signal processing unit, a broadcast frequency retrieval
mation for a particular broadcasting station based on 45
said inputted type of broadcast program for the regen
erated broadcast program, the frequency of the broad
cast radio waves of the regenerated broadcast program
and said units of said broadcasting station data.
10. The radio receiver as claimed in claim 9, wherein said 50
position information determining means includes retrieval
means which, when said indication of the type of received
broadcast program has been input, retrieves said units of
broadcasting station data in said storage means based on said
inputted indication of the type of the received broadcast
program, and the frequency of the broadcast radio waves of
the broadcast program which has been regenerated, and
selects the corresponding unit of broadcasting station data so
that the current position of the radio receiver is determined
based on the unit of broadcasting station data which has been
selected by said retrieval means.
11. The radio receiver as claimed in claim 9, wherein said
position information determining means furthermore com
prises: memory means for successively recording in a
55
complementary memory unit the frequencies of broadcast
65
radio waves received by means of said received signal
processing unit in an initial set of received signal processing
the current position of the radio receiver is determined based
on the broadcasting station data which has been selected by
said retrieval means.
a storage unit which stores a plurality of units of broad
signal processing on the broadcast radio waves and
regenerates the broadcast program; and
a position information determining means which selects
said broadcasting station position information for a
broadcast station to determine the current position of
the radio receiver, wherein said position information
determining means is provided with an input means for
inputting an indication of the type of broadcast program
which has been regenerated by means of said received
programs have been input, retrieves said broadcasting sta
tion data in said storage unit, and based on the frequencies
of the received signal radio waves and said types of broad
cast programs for the received broadcast radio waves, deter
'
corresponding to the current position of the radio
receiver based on said units of broadcasting station data
which have been selected by said retrieval means.
9. A radio receiver for receiving broadcast radio waves
transmitted by a plurality of broadcasting stations which
carry broadcast programs, each broadcast program being a
type of broadcast program received is inputted for each
means which retrieves broadcast frequencies which can
be received by said received signal processing unit in
the wide geographic area in which the radio receiver is
located, a primary decision means which compares the
broadcast frequencies retrieved by means of said broad
cast frequency retrieval means and the inputted types of
broadcast programs for the regenerated broadcast pro
grams with the broadcast frequencies and the program
types in the broadcasting station data for the broadcast
stations in the wide geographic area in which the radio
receiver is located that are stored in said storage unit,
and speci?es a second, narrow geographic area based
on the number of agreements between the frequencies
and inputted program types of the received broadcast
stations and the frequencies and program types con
tained in the stored broadcast station data and a sec
ondary decision means which, when it is impossible to
specify a second narrow geographic area based on the
number of agreements of the broadcast frequencies and
program types for the narrow geographic areas, speci
?es the narrow geographic area based on the greatest
correlation of agreements resulting from a comparison
of the broadcast frequencies and the inputted program
5,654,719
17
18
types of the received broadcast stations with the broad
cast frequencies and program types of the stored broad
providing an indication to a processing unit of a basic
geographic region in which the radio receiver is
casting station data in the wide geographic area region
located;
for the narrow geographic areas within the wide geo
graphic area.
tuning the radio receiver to a broadcast station, extracting
the carrier frequency of the broadcast station, forward
13. The radio receiver as claimed in claim 12, wherein
said primary decision means of said position information
determining means compares the broadcast frequencies
retrieved by said broadcast frequency retrieval means with
the broadcast frequencies contained in the stored broadcast
ing station data for the inputted wide geographic area,
ing the carrier frequency to said processing unit, and
reproducing the program being broadcast;
entering into said processing unit an indication of the
program format of the program being broadcast; and
10
cast station as the position of the radio receiver by
reference to a station ?le for said basic geographic
determines the number of narrow geographic areas within
the wide geographic area with the greatest number of
region, said station ?le including a plurality of station
records for individual broadcast stations, each said
agreeing frequencies in which said broadcast frequencies
and program types are in agreement, and if the number of
narrow geographic areas with the greatest number of agree
15
ments is one, then the narrow geographic area with the
greatest number of agreements is speci?ed as the current
position, and if the number of said narrow geographic areas
with the greatest number of agreements is more than one,
then said primary decision means is not employed specify
the second information area.
said processing unit determining the position of the broad
20
station record containing an indication of the carrier
frequency, program format and location of a broadcast
station, wherein said processing unit matches the car
rier frequency and program format of the received
broadcast station with the data contained in one said
station record so that the location contained in said
matched station record is recognized as the position of
the received broadcast station.
14. A method of determining the position of a radio
receiver, said method including the steps of:
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