Dual use speaker for both voice communication and signalling

Dual use speaker for both voice communication and signalling
US006035211A
Ulllted States Patent [19]
[11] Patent Number:
Rabe et al.
[45]
[54]
DUAL USE SPEAKER FOR BOTH VOICE
Date of Patent:
5,729,604
6,035,211
Mar. 7, 2000
3/1998 Van Schyndel ....................... .. 379/420
COMMUNICATION AND SIGNALLING
FOREIGN PATENT DOCUMENTS
[75]
Inventors: Karl W. Rabe, Chapel Hill; Trampas
O 440 473
8/1991
2 698 749
6/1994
France '
2 135 841
9/1984
United Kingdom .
WO 93/07680
4/1993
WIPO _
Stern, Raleigh, bOth Of
_
[73]
_
Ass1gnee: Ericsson Inc., Research Triangle Park,
N.C.
European Pat‘ 01f '
[21] APPL NO-I 08/770,706
Primary Examiner—DWayne D. Bost
Assistant Examiner—Quochien B. Vuong
[22]
Filed:
Attorney, Agent, or Firm—NiXon & Vanderhye PC.
[51]
Int. c1.7 ..................................................... .. H04B 1/38
[57]
[52]
US. Cl. .......................... .. 455/550; 455/90; 455/575;
Disclosed is a method and apparatus for automatically
379/420; 379/433
limiting the amplitude output of a speaker for a mobile
[58]
D ec- 19’ 1996
ABSTRACT
Field of Search ................................... .. 455/550, 575,
telephone When the telephone is in the active mode of
455/90, 567, 351, 569; 379/420, 433
operation. In a preferred embodiment, a tuned cavity in the
_
References Clted
Us‘ PATENT DOCUMENTS
[56]
stand-by mode operates in conjunction With the speaker to
provide a higher than normal acoustic output. When the
tuned cavity is moved aWay from the speaker, the acoustic
output returns to the level equal to the speaker s normal
4,845,772
7/1989 Metroka et al. ........................ .. 455/90
output. In an electronic embodiment, a device switching the
5,224,151
6/1993 Bowen et al
379/420
mobile telephone from the stand-by mode to the active mode
572767916
1/1994 Pawhsh et a1- "
379/433
also enables an amplitude limiter Which limits the maximum
573697701 11/1994 MeAteer ‘T’t a1‘ '
379/420
acoustic output of the speaker to a level suf?cient to prevent
5,493,690
5,537,472
455/575
379/433
hearin
2/1996 ShimaZaki .................. ..
7/1996 EsteveZ-Alcolado et a1. ..
5,542,105
7/1996
5,655,017
8/1997 Fishman ................................ .. 379/420
g
discomfort or dama 6
g '
Finch et al. ..................... .. 455/90
3 Claims, 1 Drawing Sheet
10
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U.S. Patent
Mar. 7, 2000
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6,035,211
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Fig. 4
SWITCH
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ANTENNA
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AMPIQTBFIER
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32
Fig. 5
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6,035,211
1
2
DUAL USE SPEAKER FOR BOTH VOICE
COMMUNICATION AND SIGNALLING
It is a further object of the present invention to utiliZe the
eXisting loudspeaker to generate an appropriate “ring” signal
in a mobile telephone.
It is a further object of the present invention to prevent
BACKGROUND OF THE INVENTION
1. Field of the Invention
hearing discomfort and/or damage resulting from a “ring”
The present invention generally relates to mobile tele
phones such as cordless and cellular phones and speci?cally
to those mobile telephones utilizing a speaker to convert
signal being generated by the loudspeaker When the speaker
electronic signals into acoustic signals.
2. Description of the Prior Art
Mobile telephones generally utiliZe a speaker to convert
10
electronic signals representing verbal communication into
acoustic communication signals as in a conventional tele
phone. Cordless and cellular phones generally have a
“standby” mode (When the phone is not currently being used
but When a call can be received) and an “active” mode of 15
is in the operable position neXt to the operator’s ear.
The above and other objects are achieved by a mobile
telephone design Which includes an automatic ringing vol
ume limiter When the telephone is in the “active” mode. This
object is achievable in several different fashions in accor
dance With the present invention. In one embodiment, the
telephone includes a “?ip” Which covers the speaker area of
the telephone When not being used and the ?ip includes a
channel or cavity Which serves to amplify the loudness of the
phone is in the “standby” mode of operation (the equivalent
“ring” signal When the ?ip is in the closed position (the
stand-by mode). When the ?ip is moved to the opened
position, bringing the mobile phone to the active mode, the
cavity in the ?ip is removed from proximity With the speaker
eliminating the ampli?cation of the “ring” signal from the
of a conventional telephone When the receiver is on the
speaker.
operation (When the phone is being used to generate a call
or When a call has been ansWered). In many mobile
telephones, a separate buZZer is utiliZed to generate a “ring”
signal to indicate an incoming call to the operator When the
cradle).
In order to be properly heard, the amplitude output of the
buZZer in a mobile telephone has to be over 100 dBSPL at
1 cm distance. This sound level of signalling the ringing of
the telephone Would be very obnoxious in the event that the
telephone Were to ring When a user placed the phone to his
25
insufficient to cause discomfort or damage to the operator’s
or her ear.
ear.
Accordingly, prior art mobile phones utiliZed a separate
buZZer and speaker. This also permitted the buZZer to be
BRIEF DESCRIPTION OF THE DRAWINGS
located near the end of the mobile telephone Which conve
niently Would eXtend in an upWard direction so that the
The above, as Well as other advantages and features of this
invention, Will be more completely understood and appre
buZZer could be easily heard during a “ring.”
ciated by revieW of presently preferred eXemplary embodi
During the standby mode, the telephone operates only as
a receiver and generates an appropriate “ring” signal When
the base transmitter transmits the appropriate signal to the
mobile telephone. The operational mode of the mobile
telephone can be changed from “stand-by” to “active” by the
operator keying a particular sWitch or opening the “?ip”
portion of the phone. Once changed to the active mode, the
telephone Will still ring but can also be used to generate a
35
ments taken in conjunction With the accompanying
draWings, of Which:
FIG. 1 is a side vieW partially in section of a mobile
telephone in accordance With the present invention;
FIG. 2 is an end vieW of the mobile telephone illustrated
in FIG. 1;
FIG. 3 is a partial side vieW partially in section of the
mobile phone shoWn in FIG. 1;
call (dial out) or to “ansWer” and converse With a party Who
has called in to the telephone.
It is desirable to reduce the costs of manufacturing such
mobile telephones by reducing the number of parts and, if
possible, reducing the area of required printed circuit boards
by eliminating the buZZer and its associated circuitry. It has
In another embodiment, an electronic ring volume limiter
is enabled When the ?ip is opened or, in a non-?ip telephone,
When a sWitch activated (to change from the standby mode
to the active mode). Thus, a signal With at least the speci?c
frequency of the “ring” signal is limited to an amplitude
FIG. 4 is a partial side vieW of a further mobile telephone
in accordance With the present invention; and
45
FIG. 5 is an electronic block diagram of one embodiment
of the present invention.
been proposed to use the loudspeaker as the generator of the
DETAILED DESCRIPTION OF PREFERRED
EMBODIMENTS
acoustic “ring” signal. HoWever, utiliZation of the speaker
causes some difficulties in that, if the “ringing” signal
generated by the speaker is suf?ciently loud to signal the
In discussion of the preferred embodiments illustrated in
consumer that the phone is “ringing,” this acoustic signal
could also create discomfort and/or hearing damage in the
operator of the mobile telephone if the phone “rang” When
the operator has the phone in use, i.e., neXt to the operator’s
the accompanying draWings, similar numbering Will be used
ear.
for similar structures among these several vieWs.
In FIG. 1, the method and apparatus according to the
present invention is disclosed and includes a mobile tele
55
It is also desirable to eliminate the holes in the cover of
a mobile telephone Where such holes normally Were in
mode) as illustrated in solid lines and an open position
conjunction With the buZZer location to provide the maXi
mums put during the “ringing” of the telephone.
(active mode) as illustrated in phantom lines. The body 16
of the mobile telephone includes a speaker 18 Which gen
erates conventional acoustic signals for voice communica
tion and also generates an acoustic “ring” signal. The
utiliZation of the loudspeaker 18 for both voice communi
cation and the “ring” signal obviates the need for a separate
buZZer and the associated buZZer control circuitry as in
Unfortunately, the use of such holes provides an additional
opening in the mobile telephone permitting impurities, dirt,
Water, etc. to enter the mobile telephone.
SUMMARY OF THE INVENTION
In accordance With the above discussion, it is an object of
the present invention to eliminate the need for a separate
buZZer to be utiliZed to generate a “ring” signal in a mobile
telephone.
phone 10 having a “?ip” portion 12 Which includes a hinge
14. The ?ip is movable betWeen a closed position (standby
65
conventional mobile telephones.
In a preferred embodiment, the sound of the phone ringing
is directed out of the top of the phone. The loWer acoustic
6,035,211
3
4
output of the loudspeaker is ampli?ed by the use of a tuned
in a preferred embodiment but this is not a requirement of
cavity 20 Which is located adjacent the loudspeaker 18.
the amplitude limiting feature. Additionally, sWitch 24 could
Tuned cavity 20 can be either a helmholtZ resonator, a
be substituted for sWitch 22 or sWitch 28 in a non-?ip
quarter Wavelength stub, horn loading, or other tuned reso
nating device (or combinations of these) Which serves to
amplify the volume level of the ring signal from the loud
speaker. While the volume of the acoustic signal provided by
embodiment and, in such embodiment, could also be utiliZed
to change the mode from standby to active as previously
discussed.
In vieW of the above disclosure, one of ordinary skill in
the loudspeaker 18 is ampli?ed to enable the operator to
the art Will be aWare of many modi?cations and changes to
clearly appreciate When the phone is “ringing” (When the ?ip
12 is in the closed position or standby mode), the volume is
not ampli?ed When the mobile telephone is in use (When the
?ip 12 is in the open position or active mode).
10
?ip operated sWitches Whether in the form of a microsWitch
22 or a hall effect sWitch 28 or non-?ip operated sWitches
such as manual sWitch 24 can be utiliZed not only to change
It can be seen from FIG. 1 that When the ?ip 12 is in the
open position or the active mode, the tuned cavity is not
located adjacent speaker 18 and therefore there is no ampli
speci?c applications Which Will utiliZe the present invention
to varying degrees of bene?t. It has already been noted that
the operating mode of the mobile telephone but also to
15
enable an amplitude limiter so as to prevent the loudspeaker
?cation of the speaker output. Accordingly, if the phone has
been placed in the active mode (perhaps prior to actually
18 from providing an output greater than a predetermined
level.
placing a call), an incoming call is received, the volume of
the “ring” Will be at the safe loWer acoustic level than if
ampli?ed With the ?ip 12 is in the closed position. This
feature then permits the use of speaker 18 to accomplish
both the voice communications and the “ringing” function
con?gurations depending upon the loudspeaker 18 and the
tuned cavity 20 located in ?ip 12 Which Will amplify the
output of the loudspeaker When the cavity and loudspeaker
but at the same time prevents discomfort and/or damage to
acoustical output When they are separated. Thus, the present
It Will also be apparent that there are numerous acoustical
are in close contact and yet Will not amplify the loudspeaker
the operator’s hearing.
invention includes both mechanical and electrical concepts
FIG. 3 illustrates the use of a sWitch Which in a preferred 25 for limiting the volume of a mobile telephone “ring” When
embodiment signals that the ?ip 12 is in the closed position
to automatically change the mobile telephone from the
active mode (When the ?ip is in the open position) to the
stand-by mode (When the ?ip is in the closed position) and
in the “active” mode.
Accordingly, the present invention is limited only by the
claims appended hereto and, in the broadest sense, is not
limited to the speci?c eXamples included in this application.
vice versa. A similar operator controlled mode sWitch 24 is
shoWn in FIG. 4. As shoWn in FIG. 1, in one embodiment of
the present invention, a magnet 26 is located in the ?ip 12
and the proximity of the magnet is sensed by hall effect or
equivalent reed sWitch 28. Thus, the output of sWitch 28 can
be used to change the operating mode of the mobile tele
phone from standby to active and vice versa. An additional
use for the ?ip controlled mode sWitch 22, hall effect/reed
What is claimed is:
1. A mobile phone including a mobile phone ringing
35
sWitch 28 or the operator controlled mode sWitch 24 Will
There may be circumstances under Which the volume
45
then actually limit the maXimum amplitude of any acoustic
signal generated by the loudspeaker When the mobile tele
provided by said loudspeaker to a predetermined level
and, responsive to said sensed mode of said mobile
phone being in a standby mode, for not limiting the
volume of the loudspeaker to the predetermined level,
phone is in the active mode.
FIG. 5 illustrates as a simple block diagram the manner in
Which sWitch 22, sWitch 24 or sWitch 28 could serve to
control a volume limiter in a mobile telephone circuit. The
incoming signal, Whether a voice communication or a “ring”
Wherein said mobile phone includes at least one
55
Of course, sWitch 22 can also be used to signal the
ampli?er to change from standby to active mode as it would
mechanical ampli?er comprising a tuned cavity, said
mechanical ampli?er associated With said loudspeaker,
Where, in said closed position, said mechanical ampli
?er is adjacent said loudspeaker and ampli?es an
acoustic signal from said loudspeaker, and, in said open
position, is aWay from said loudspeaker and does not
amplify any acoustic signal from said loudspeaker.
2. The mobile phone according to claim 1, Wherein said
?ip comprises at least a portion of said mechanical ampli?er,
and said mechanical ampli?er is disrupted When said ?ip is
in said open position.
32 Would be obvious to those of ordinary skill in the art in
vieW of this disclosure and is not included for the purpose of
clarity.
ing:
means for sensing the mode of said mobile phone;
means, responsive to said sensed mode of said mobile
phone being in an active mode, for limiting the volume
signal Which Will be above some desired maXimum level and
signal, is received by the antenna and provided to ampli?er
30 Which decodes and ampli?es the received signal Which
Would normally be applied directly to speaker 18. HoWever,
in this preferred embodiment, an amplitude limiter 32 is
interposed betWeen ampli?er 30 and speaker 18 and serves
to limit the maXimum amplitude of any signal applied to
speaker 18 When the limiter is enabled by sWitch 22. The
actual circuitry of the ampli?er 30 and the amplitude limiter
said standby mode permits ringing of the mobile phone, said
mobile phone including a loudspeaker for converting elec
trical signals received by said mobile phone into acoustic
signals, Where a mobile phone operator determines the mode
of operation, said mobile phone including a ?ip controllable
by said mobile phone operator and moveable betWeen open
and closed positions, said open position corresponding to
said active mode and said closed position corresponding to
said standby mode, said automatic volume limiter compris
noW be discussed.
ampli?cation of the acoustical output of the mobile tele
phone during a “ring” is not sufficient When the tuned cavity
20 is located adjacent speaker 18. In such cases of a ?ip
phone or in potentially all cases of a non-?ip phone, it may
be necessary to drive the loudspeaker With a higher poWer
system With an automatic volume limiter, said mobile phone
operable in active and standby modes Where said active
mode permits communicating over the mobile phone and
65
3. A method of limiting the volume of a loudspeaker in a
mobile phone having a mobile phone ringing system, Where
said mobile phone is operable in active and standby modes,
6,035,211
5
6
Where said active mode permits communicating over the
comprising an active mode for said mobile phone, said
mobile phone and said standby mode permits ringing of the
mobile phone, said mobile phone including a loudspeaker
for converting electrical signals received by said mobile
phone into acoustic signals, Where a mobile phone operator 5
determines the mode of operation, said method comprising
the Steps of:
loudspeaker limited to providing an output amplitude
insu?iciently large to harm the hearing of said mobile
sensing the mode of said mobile phone;
phone operator, said limiting step including:
providing Said ?ip With a tuned Cavity ampli?er,
locating said tuned cavity ampli?er adjacent said loud
speaker When said ?ip is in said closed position and
aWay from said loudspeaker When said ?ip is in said
limiting, in response to said sensed mode of said mobile 10
open position, said tuned cavity ampli?er amplifying
phone being in an active mode, the volume provided by
said loudspeaker to a predetermined level, Wherein said
said loudspeaker output amplitude so as to be su?i
ciently large as to cause damage to hearing of said
mobile phone includes a ?ip moveable betWeen a
operator.
closed position and an open position, said closed posi
tion comprising a standby mode and said open position
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