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US005363434A
United States Patent [191
[11] Patent Number:
Farinelli et al.
[451
[54] AUDIO DISTRIBUTION SYSTEM
[75]
Inventors: Robert Farinelli; Bruce B. Stevenson;
Bill R- Unseld, all Of Lexington, KY-
[73]
[56]
,
Asslgnee'
[ * ] Notice:
1
Square D Company’ Palatme’ In‘
Date of Patent:
5,363,434
* Nov. 8, 1994
References Cited
U.S. PATENT DOCUMENTS
3 978 468 8/1976 Bond et 31
4,113,986 9/1978 Clement et a1. ..
379/103
379/103
4,554,411 11/1985
Armstrong ..... ..
379/103
4,987,589
Trell ................... ..
379/103
1/1991
5,131,048 7/1992 Farenelli et al. .................... .. 381/81
The portion of the term of this patent
Pr1.7""), grammar-Stephen Chi_n
Subsequent to Jul 14’ 2009 has been
disclaimed
Asszstarzt Examzner—Paul Loom1s
Attorney, Agent, or Firm—Larry I. Golden; Kareem M.
'
Irfan
[21] Appl. No: 818,664
[57]
[22] Filed:
A signal distribution and communication arrangement
controls the broadcast of different types of signals
Jam 9 1992
’
R l ted US. A n. ti
_
e'a _
ABSTRACT
through speakers located in various zones. The system
includes a telephone interfaced with a door speaker
controller to allow communication between the tele
Data
pp ca on
phone and a door speaker. A page may be broadcast
[631
conmuailon'm'pm of Ser- NO- 639,507’ 1999,1991’
Pat" No‘ 5’131’048'
over the speakers and subsequently muted to allow
private communication when the page is answered.
[51]
Int. Cl.5 ........................................... .. H04R 27/00
Sponds to a doorbell source. The doorbell source may
[52]
U.S. Cl. .................................. .. 379/170; 379/171;
be activated by any one of a plurality of doorbell
[58]
Field of Search ............. .. 379/159, 170, 171, 167,
Also included is a doorbell interface circuit that re
381/81; 381/85
switches.
24 Claims, 12 Drawing Sheets
379/103; 381/81, 85; 455/174.1
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US. Patent
Nov. 8, 1994
Sheet 1 of 12
5,363,434
Fig. 1
100
A
104 §
ZONE A
___|? ZONE B
0
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105
000
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US. Patent
Nov. 8, 1994
Sheet 2 of 12
5,363,434
Fig. 2
102
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US. Patent
Nov. 8, 1994
Fig. 3
Sheet 3 of 12
5,363,434
~%——
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+
INPUT
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US. Patent
Nov. 8, 1994
Sheet 4 of 12
5,363,434
RIGHT
_" STEREO
FEED
176
RIGHT
STEREO
INPUT R2
SHIELD
LEFT
TO
MUTE
R4
W
174
.
R
_
MUSIC
ON
HOLD
194
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N
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US. Patent
Nov. 8, 1994
Sheet 7 0f 12
5,363,434
Fig. 6B
DOOR BELL 106
I663
SAB 0602 TwO TONE CHIME C2
OOOR
'
'
3
R6FEED
SAB 0600 THREE TONE CHIME
184
DIGITAL
1
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GENERATOR
TONE
AMPLIFIER
AND
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7 +|I,\
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186
US. Patent
Nov. 8, 1994
Sheet 10 of 12
5,363,434
RIGHT AMP
OUTPUT +
RIGHT AMP
OUTPUT -
190
LEFT AMP
OUTPUT +
LEFT AMP
OUTPUT -
US. Patent
Nov. 8, 1994
Sheet 11 of 12
5,363,434
902
904
906
908
AMPLIFIER
Fig. 9
US. Patent
Nov. 8, 1994
Sheet 12 of 12
5,363,434
Fig. 10
1002
+0
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1006
1004
+
0
10?
1
5,363,434
2
The present invention is a signal distribution and
REFERENCE TO RELATED APPLICATION
communication arrangement for controlling the broad
cast of a plurality of different types of signals through
speakers located in various zones. The system includes
The present application is a continuation-in-part of
U.S. application Ser. No. 07/639,507 ?led Jan. 9, 1991,
U.S. Pat. No. 5,131,048.
a telephone interfaced with a door speaker controller to
allow communication between the telephone and a door
speaker. A page may be broadcast over the speakers and
AUDIO DISTRIBUTION SYSTEM
subsequently muted to allow private communication
when the page is answered. Also included is a doorbell
interface circuit that responds to a doorbell source. The
doorbell source may be activated by any one of a plural
FIELD OF THE INVENTION
The present invention relates generally to audio dis
tribution systems and, more particularly, to circuit ar
ity of doorbell switches.
In one preferred embodiment, these and other objects
of the present invention are realized using a signal distri
bution and communication arrangement for controlling
the broadcast of a plurality of different types of signals
rangements for integrating various types of signals in
audio distribution systems.
BACKGROUND OF THE INVENTION
Home owners are rapidly becoming aware of the
through speakers located in various zones. The arrange
ment includes an audio receiver for receiving a substan
bene?ts of home audio distribution systems. These ben
e?ts include convenient access to audio signals through
tially continuously generated signal. A tone generator
out the home, more ef?cient use of space and savings in 20
circuit is employed to respond to at least one doorbell
the form of fewer system components.
Audio distribution systems range from those distrib
uting stereo signals only, to those incorporating other
generator signal from either a lighted or non-lighted
doorbell button. The tone generator circuit produces
functions such as doorbells and intercoms. These sys
tems frequently utilize a switching matrix to distribute a
also employs a home telephone interface circuit that
one of two separate tone sequences. The arrangement
will permit access to a front door intercom from any
signal, generated and ampli?ed by a stereo system, to
various rooms throughout the house. Speakers in the
various rooms typically receive the ampli?ed signal
home extension by the dialing of a touch tone code.
Similarly, a door latching circuit can be activated from
any home extension by dialing a touch tone code. Tele
through a distribution panel co-located in the room
phone calls may be placed on hold by dialing another
with the stereo system.
30 predetermined code. A paging interface circuit can be
Prior art systems offering integrated functions such as
accessed from any home extension by dialing a different
distribution of stereo, doorbell and intercom signals
touch tone code. An ampli?er circuit is coupled to
have several setbacks. For example, many of these prior
art systems seeking to improve sound quality have uti
speakers and slave ampli?ers to amplify the substan
lized the home owner’s high power stereo system and a
switching matrix to distribute a pre-ampli?ed stereo
tone and the page signal. A control circuit prioritizes,
tially continuously generated signal, the predetermined
selects and couples the substantially continuously gen
erated signal, the predetermined tone and the page sig
signal. Unfortunately, these systems are unable to effec
tively integrate other important features, such as door
bell and paging.
Another setback of prior art systems is the inconve
nience of using the intercom. These systems typically
have the page button and speaker/receiver located on
the audio distribution wall unit. This requires the inter
nal to the ampli?er circuit for broadcast through the
speakers.
BRIEF DESCRIPTION OF THE DRAWINGS
Other objects and advantages of the invention will
become apparent upon reading the following detailed
description and upon reference to the drawings in
com user to go to the location of the intercom system, as
opposed to accessing it from a more convenient loca 45 which:
tion.
FIG. 1 is a block diagram of an audio distribution
Accordingly, there is a need for an audio distribution
ampli?er system, according to the present invention;
system that can be implemented without the aforemen
FIG. 2 is a diagram illustrating, in more detail, vari
tioned shortcomings.
SUMMARY OF THE INVENTION
A general object of the present invention is to pro
vide a signal distribution and communication arrange
ment which overcomes the above de?ciencies.
Another object of the present invention is to provide
an arrangement for controlling the broadcast of a plu
rality of different types of signals through speakers
located in various zones, using a control circuit which
responds to various signal interface circuits by selecting
which of the music, audio, page and doorbell signals
from the interface circuits should be broadcast through
the speakers.
Still another object of the present invention is to
provide an arrangement for a front door intercom, a
ous inputs to the audio distribution ampli?er system of
50
FIG. 1;
FIG. 3 is a circuit diagram illustrating a preferred
embodiment of one of two identical wall plate interface
circuits, in accordance with the present inventions,
which may be used as a buffer between the stereo sys
tem and the audio distribution amplifier of FIG. 2;
FIG. 4 is a block diagram, according to the present
invention, illustrating the basic functional circuits inter
nal to the audio distribution ampli?er of FIG. 2;
FIG. 5 is a circuit diagram illustrating a preferred
embodiment of the stereo signal pre-ampli?cation and
equalization stages and the threshold detection circuitry
of FIG. 4;
FIG. 6A is a circuit diagram illustrating a preferred
embodiment of the communications module and door
telephone extension conferencing circuit and an incom 65 bell circuit including interfaces for a telephone line,
ing telephone line hold circuit that is activated through
any home touch tone telephone extension by dialing a
code on the telephone handset.
telephone station and key system, doorbell, door inter
com, paging feed and control and the signalling, timing
and control functions of FIG. 4.
3
5,363,434
FIG. 6B is a circuit diagram illustrating the doorbell
generator circuit of FIG. 4;
FIG. 7(A-B) is a circuit diagram illustrating a pre
ferred embodiment of a control circuit used to imple
ment the threshold detection, mute and audio signal
4
1.0 V (peak to peak) and 10 k9. to 100 kQ, respectively.
A remote master gain control 111 (FIG. 2) in the wall
plate interface circuit 110 (mounted on printed circuit
board 109, shown in FIG. 2) provides volume control.
Ideally, the wall plate interface circuit 110 and the gain
output pre-ampli?cation functions of FIG. 4;
control 111 are located near the associated stereo so that
FIG. 8 is a circuit diagram illustrating a preferred
the stereo signal may be properly distributed without
embodiment of the audio signal output power ampli?ca
degradation.
tion circuit of FIG. 4;
The interface illustrated in FIG. 2 also includes a
FIG. 9 is a diagram illustrating four preferred speaker 10 remote stereo defeat control switch 112 which disables
hook-up con?gurations; and
the stereo signals presented to the ADA system 100
FIG. 10 is a diagram illustrating a volume control
when closed. When the defeat control switch is open,
the left and right signals from the stereo 102 are deliv
ered to the ADA system 100 via two signal cables 113.
audio transformer in accordance with the present inven
tion.
While the invention is susceptible to various modi?
Each signal cable preferably consists of a single 22
cations and alternative forms, a speci?c embodiment
A.W.G. conductor with a bell foil shield and drain wire.
thereof has been shown by way of example in the draw
The cable lengths are desirably between 20 and 200 feet.
ings and will be described in detail. It should be under
FIG. 2 also illustrates the incoming telephone line
stood, however, that it is not intended to limit the inven
101, which is connected to the telephone handset 105
tion to the particular form described. On the contrary, 20 through the ADA 100. Whenever a telephone feature is
the intention is to cover all modi?cations, equivalents
activated by dialing a predetermined code on the tele
and alternatives falling within the spirit and scope of the
phone handset 105, a hold function is applied to the
invention as de?ned by the appended claims.
telephone to prevent disconnection of an active conver
sation.
DESCRIPTION OF THE PREFERRED
25
In a preferred embodiment, a communications mod
EMBODIMENTS
ule 192 (FIG. 4) monitors a continuously generated
FIG. 1 illustrates the basic con?guration of the pres
signal to detect when the telephone handset is taken
ent invention in a typical application. The audio distri
“off hook.” This monitoring function also detects ap
bution ampli?er (ADA) system 100 receives as inputs
propriate
predetermined codes used to activate paging,
left and right line level signals from the home owner’s 30
muting, door intercom, latching and hold features.
personal stereo 102, substantially continuously gener
ated audio signals from the incoming telephone line 101,
When a predetermined code is dialed by the user, the
communications module 192 performs the functions
a telephone handset 105, a home owner’s personal key
necessary to permit the handset to be used to page, hold
mittently generated doorbell signal from at least one 35 a private conversation with another handset, converse
with someone at the door speaker controller 104, oper
doorbell source. The doorbell source may be activated
ate a latching device from the door speaker controller
by doorbell switches 106. The ADA system 100 gener
104 or put the incoming telephone line 101 on hold.
ates, as outputs to speakers located in a plurality of
An interface is provided for the homeowner’s per
different zones A-D and a slave ADA 108, any of the
following: (1) a triple or dual tone doorbell signal for 40 sonal key system 107, which can initiate a paging signal.
In the preferred embodiment, the key system 107 acti
which switch activated the doorbell source; (2) a voice
vates the interface by- presenting a continuously gener
paging message originating by dialing a predetermined
system 107, a door speaker controller 104 or an inter
code on the telephone handset 105; (3) through the key
system 107 after a page command is initiated; or (4)
ampli?ed left and right stereo signals corresponding to
line level signals received from the homeowner’s per
sonal stereo 102. The present system will also be inter
faced with a door speaker controller 104 to allow com
45
ated signal and the ADA 100 responds by activating the
paging control circuit to permit the key system 107 to
be used for paging.
An interface is provided for the door speaker control
ler 104 so that the telephone handset 105 can be used to
converse with someone at the door intercom location
and operate a latching device associated with the door
munication between the door speaker controller 104
and the telephone handset 105 when a predetermined 50 speaker controller 104. Whenever a door button 106 on
the door speaker controller 104 is pressed, a multiple
code is dialed on the telephone handset 105.
tone is broadcast over the paging system. Upon taking
Other predetermined codes may be pressed to mute
the telephone handset “off hook” and dialing the prede
the output of the ADA 100 when the page is answered
termined code to access the door speaker controller
to allow a private conversation. To accomplish this, the
muted page prevents the conversation from being 55 104, the communications module 192 places the incom
ing telephone line 101 on hold and connects the tele
broadcast over the remainder of the paging system.
phone handset 105 to the door speaker controller 104,
Other functions that can be accomplished include oper
allowing the user to converse with someone at the door
ation of a door latching device through the door
intercom location. While the connection is completed
speaker controller 104 and placing a call on hold to
between the telephone handset 105 and the door inter
permit the call to be picked up from another telephone
location.
com unit, the user can dial a predetermined code to
activate a door latching device associated with the door
The interface between the ADA system 100 and the
output of the stereo 102 is illustrated in FIG. 2. The
speaker controller 104 through the telephone handset
105.
interface includes a wall plate interface circuit 110
which receives and buffers left and right signals from a 65
Power to the ADA system 100 may be provided
typical consumer music system, such as a stereo ampli
using a conventional AC domestic power source (not
?er or radio receiver 102. The range of stereo output
shown) and a transformer 103 providing +15 V and
signal levels and impedances is preferably from 0.1 V to
~15 V AC power levels to the ADA system 100.
5
5,363,434
Power to the wall plate interface circuit is provided by
a power supply in the ADA 100 (wires not shown).
Referring now to FIG. 3, there is illustrated one of
two identical wall plate interface circuits which may be
used for converting and buffering a respective one of
the left or right stereo signals from a single-ended to a
balanced signal. The circuit includes a conventionally
arranged stereo feed ampli?cation circuit based around
a TL074-type operational ampli?er 156. The resistor
and capacitor values in the circuit of FIG. 3 may be
6
phone line 101 from the telephone distribution lines 115
and couples the telephone distribution lines 115 to the
SLIC 610, allowing communication with the door
speaker controller 104.
Upon receipt of a still different DTMF code (for
example, *) after the previous code has been processed,
the communications module activates a latching control
signal to activate the door latching device connected to
the door speaker controller 104. The door latching
device remains active as long as the appropriate DTMF
implemented using typical values well-known in the art.
FIG. 4 illustrates, in block diagram form,'the basic
code is sent over the telephone distribution line 115.
functional circuits internal to the ADA system 100 of
107, the SLIC interface 610 generates a page control
signal 129 that the selection/control circuit 180 uses to
mute the stereo signal and unmute the page signal input
130 into the selection and control circuit 180, so that it
can be coupled to the preampli?ers 188 and power
FIG. 2. From the stereo signal cables 113 provided by
the wall plate interface circuit of FIG. 3, the stereo (or
music) signal is received by conventional pre-ampli?ca
tion and equalization circuit stages 170 and 172 and by
threshold detection circuitry 174, the latter of which
monitors the left and right stereo signal feeds 176 for
low level audio signals. If the stereo signals are absent
Upon receiving a paging signal from the key system
ampli?ers 190.
A conventional power supply/recti?cation circuit
210 may be used to convert the AC power levels to
or at a negligible level, the detection circuitry 174 initi
complementary DC power levels for the above de
ates a control signal, over feed 178, which instructs a
scribed circuitry.
FIG. 4 further illustrates the signal selection/control
selection/control circuit 180 to block any noise at the
output of the equalization stages 172 from reaching the
speakers.
A momentary closure of one of the two doorbell
switches 106 will cause an intermittent doorbell signal
to be received by the doorbell tone circuit 182. The
doorbell tone circuit 182 will then generate two signals.
The ?rst is either a two-tone or three-tone sequence
which will identify the doorbell switch 106 that initi
ated the doorbell signal. The second is a doorbell con
trol signal that the selection/control circuit 180 uses to
mute the stereo signal inputs 176 and unmute the two
or three-tone sequence 184 so that it can be coupled to
the preampli?ers 188 and power ampli?ers 190.
The incoming line 101 and the telephone distribution
circuit 180, which couples the selected stereo 176,
25 unique tone sequence 184 and page signal 130 to the
output ampli?ers 188 and 190. When more than one
control signal is presented to the selection/control cir
cuit 180 simultaneously, the input signal with the high
est priority is coupled to the speakers. The signal priori
ties for the illustrated embodiment are (from highest to
lowest): page, doorbell, stereo and mute.
The output ampli?cation stages 188 and 190 and the
slave ADA output stage 108 are also illustrated by FIG.
4. The arrangement bridges the stereo signal cables 133,
35 the doorbell feed and control 184, the paging feed 130
and paging control 129 leads to the slave ADA output
leads. The arrangement uses conventional audio pre
line 115 to the extensions are connected to the commu
ampli?cation and power ampli?cation circuitry 188 and
nications module 192. The incoming line 101 is nor
190 to distribute the selected information signal to
speakers in a plurality of different zones A-D.
FIG. 5 illustrates a preferred circuit for implementing
mally bridged to the telephone distribution line 115.
Upon the receipt of a predetermined DTMF code over
the telephone distribution line 115, the communications
module 192 performs the functions necessary to permit
the stereo pre-ampli?cation and equalization stages 170
and 172 and the threshold detection circuit 174 of FIG.
4. The illustrated stereo pre-ampli?cation circuit 170 is
the handset 105 to be used to page, hold a private con
versation with another handset, converse with someone 45 one of two identical circuits used to convert a respec
tive one of the left or right stereo signals from a bal
at the door speaker controller 104, operate a latching
anced signal to a single-ended signal. The circuit in
cludes a balanced termination resistor 501 and a conven
an incoming telephone call on hold. Upon receipt of the
tionally arranged ampli?cation circuit based around a
appropriate DTMF code (for example, #7) over the
telephone distribution line 115, the communications 50 TL074-type operational ampli?er 502. The resistor and
capacitor values in the pre-ampli?cation circuit 170 of
module 192 uncouples the incoming telephone line 101
FIG. 5 may be calculated using 1009 for R1, 4990 for
from the telephone distribution line 115 and couples the
R2, 10K 9 for R3 and 47 pf for C1.
telephone distribution line 115 to the paging feed 130.
The threshold detection circuit 174 monitors the left
The communications module 192 also generates a page
control signal 129 to unmute the page signal input 130 55 and right stereo signal lines 176 for low level audio
signals. As previously noted, the DC control line 178
into the selection and control circuit 180, so that it can
goes high when the stereo signal levels are absent or
be coupled to the preampli?ers 188 and power ampli?
their levels become negligible. This instructs the selec
ers 190.
tion/control circuit (180) to mute the stereo channel.
Upon receipt of a second DTMF code after the initial
The threshold detection circuit 174 includes two
code has been processed, the communications module
summation resistors 512 and 514 and a TL074-type
deactivates the page control signal 129, muting the
operational ampli?er 516 in a buffered voltage-follower
paging feed 130. The telephone distribution lines 115
con?guration. A capacitor 522 connected between the
remain coupled to the communication module’s internal
device from the door speaker controller 104 and to put
SLIC 610 FIG. 6A), allowing the handset 105 to con
verse with another extension.
ampli?er’s output and negative input provides noise
65 reduction for the stereo signal.
Upon receipt of a different DTMF code (for example,
#3) over the telephone distribution lines 115, the com
The ?nal stages of the threshold detection circuit 174
includes a TL074 type operational ampli?er 524, ar
munications module 192 uncouples the incoming tele
ranged for signal recti?cation and ampli?cation. The
7
5,363,434
diode 526 provides for recti?cation, while the capacitor
538 provides additional noise reduction. The resistor
and capacitor values for the threshold detection circuit
are 10K .0 for R4, 3.3M Q for R5, 301.0 for R6, 221K
.0 for R7, 20K 9 for R8, 10 pf for C3, 22 pf for C4 and
10 pf for C5.
FIG. 6A illustrates in block diagram form the basic
functional connections between the ADA mother board
100 and the communications module 192, key systems
interface circuit 196 and the doorbell generator board
,
8
when triggered. As will be apparent to one of ordinary
skill in the art, the SAB 0602 may be used in place of the
SAB 0600. Similarly, the SAB 0602 may be used to
produce the tone associated with one doorbell button
106 and the SAB 0600 may be used to produce the tone
associated with a different doorbell button 106 in the
same system. Resistor and capacitor values in the door
bell circuit illustrated in 6B are 689. (1 watt) for R1,
47.59 for R2, 1000 for R3, 1 k0. for R4, 37.5 k!) for R5,
10 kQfor R6, 0.1 pf for Cl, 0.22 pf for C2, 0.47 pf for
C3 and 0.0047 pf for C4. An LM317T is provided in the
doorbell circuit to reduce the +15 V DC input voltage
to the required +8 V DC operating voltage.
The following examples are given to clarify the oper
The SLIC 610 processes the audio signal received 15 ation of the system of the present invention. When a
through the lines 115 by passing the signal through a Tx
handset 105 is taken “off hook” and a predetermined
output 614 to the audio multiplexor 650 and the SH0
code is dialed on the telephone handset (for example,
output 618 to the control circuit 620. Signals received
#), signals are sent from the DTMF receiver 630 to the
from the audio multiplexor 650 over an Rx input 616 are
GAL 620 (FIG. 6A), which starts a timer 624. The
passed through the lines 115 to the telephone handset 20 timer 624 counts a timing period of 4 seconds within
182. The communications module 192 embodies a line
interface circuit (SLIC) 610, a control circuit 620, a
DTMF receiver 630, a hold and release circuit 640 and
an audio multiplexer 650.
105.
which a second digit must be received from the handset
105. If the second digit is not received within the 4
logic device that processes signals received from the
second period, the tone circuit signals the extension user
DTMF receiver 630. Also included is a delay and tim
that time has expired and the GAL 620 will reset. If a
ing circuit 624 to activate a hold and switching relay 25 second digit is received within 4 seconds and is one of a
The control circuit 620 embodies a programmable
circuit 640, the outputs to the paging control 128 and
latching control 628 circuits. The tone circuit 626 is
used to signal the handset 105 when a digit time-out
predetermined group (for example, a 1,2,5,6,8,9, 0,#,*),
the GAL 620 will reset.
If the second digit is, for example, a 3, and the PHl
lead is in a Hi state, the GAL 620 will signal the DRM
The DTMF receiver 630 processes DTMF signals 30 which signals the SLIC 610. The GAL 620 also ?res an
from the handset 105 and passes these signals to the
SCR in the Hold Circuit 640, and activates a line relay
control circuit 620 in a hexadecimal format through
to switch the extensions to the internal SLIC 610.
output leads 636. A buffer 632 is placed between the
If the second digit is, for example, a 7, and the PHI
lines 115 and the DTMF receiver for protection.
lead is in a Hi state, the GAL 620 will set the TX input
The release and hold circuit 640 includes a switching 35 614 from the SLIC 610 to the Audio Multiplexer 650 to
relay 642, a hold circuit with “music on hold” capability
the Page 654 circuit. The GAL 620 will also ?re the
194, a hold release relay 648 and a hold decay circuit.
SCR in the Hold Circuit 640 and activate a line relay to
The audio multiplexor 650 is used to switch voice and
switch the extensions to the internal SLIC 610.
control signals between the SLIC circuitry 610, the
If the second digit is, for example, a 4, and the PHI
paging and control circuits 652, as well as the door
lead is in a Hi state the GAL 620 will disable the possi
speaker, mike and control circuits 656. The VOX cir
ble activation of the release circuit 646 whenever the
cuit 654 is used to control feedback on the front door
extension goes “on hook.” The GAL 620 will ?re the
intercom associated with the door speaker controller
SCR in the Hold Circuit 640 and activate a line relay to
104.
switch the handset 105 to the internal SLIC 610.
FIG. 6B, which illustrates a preferred circuit embodi 45
If a third digit is dialed and is, for example, a
ment of the doorbell generator board 182, includes an
1,2,5,6,8,9, or #, the GAL 620 will reconnect the hand
LM 393AN Comparitor 660, an SAB0060 Three Tone
set 105 to the telephone line 101.
Chime 662 and/or an SAB0062 Two Tone Chime 663.
If the third digit is, for example, a 3 and the GAL 620
With the intermittent closure of one of the two doorbell
is in the DRM state, no change will occur. If the GAL
switches 106, the power provided to input 670 of the 50 620 is not in the DRM state it will reset, clear the PGM,
comparitor 660 is increased over the reference voltage
DRM, PGC, INT and HLD leads and reconnect the
at input 672, transmitting a triggering voltage into the
handset 105 to the telephone line 101.
chime 662. The trigger 674 activates the digital tone
If the third digit is, for example, a 4 and the GAL 620
generator 676, which applies tones to an ampli?er 678.
is in the HLD state, no change will occur. If the GAL
The output of the ampli?er 678 is transmitted to the 55 620 is not in the HLD state, it will reset, clear the PGM,
doorbell feed 184. Simultaneously, the trigger 674 ap
DRM, PGC, INT and HLD leads and reconnect the
plies voltage to tone generator pin 680, which is held for
handset 105 to the telephone line 101.
the duration of the tone sequence. This voltage is used
If the third digit is, for example, a 7 and the GAL 620
as the doorbell control voltage 186. When the tone
is in the PGM state, no change will occur. If the GAL
sequence is completed, the output voltage from 680 is 60 620 is not in the PGM state, it will reset, clear the PGM,
lowered to 0 volts, disabling the control signal 186 and
DRM, PGC, INT and HLD leads and reconnect the
the Chime 662.
handset 105 to the telephone line 101.
The Chime 662, which is manufactured by Siemens
If the third digit is, for example, a 0 and the GAL 620
AG of Germany, is a single chip that produces a sound
is in the PGM state, the PGC lead will go Lo, disabling
signal according to the tempo, rhythm and tones pro 65 the page control 626. If the GAL 620 is not in the PGM
grammed by the manufacturer when triggered by a DC
state, it will reset, clear the PGM, DRM, PGC, INT
signal. The SAB 0600 emits a three tone chime when
and HLD leads and reconnect the handset 105 to the
occurs.
triggered and the SAB 0602 emits a two tone chime
telephone line 101.
5,363,434
10
If the digit is, for example, a * and the GAL 620 is in
the DRM state, the DRL lead goes from L0 to Hi,
follows: 10 k!) for R4, 1 k!) for R5, 22 k!) for R17, 10
(1 Watt) for R18, 0.1 micro-farad for C14 and 100 pf for
activating the Latch Control 628 as long as the “*”
C13.
button is depressed. If the GAL 620 is not in the DRM
FIG. 9 demonstrates four exemplary alternative
state it will reset, clear the PGM, DRM, PGC, INT and
hook-up con?gurations 902, 904, 906, 908 for lines run
ning from the ampli?ers 190 to the speakers located in
HLD leads and reconnect the handset 105 to the tele
phone line 101.
If an extension goes “on hook,” a multivibrator ?res
over the HKP lead. If the HLY lead is Lo (normal
each of the zones A-D. Because the output ampli?ers
109 are in a balanced bridgeable output con?guration,
the bridgeable left and right output ampli?ers 109 can
state), the CLR lead sets form Hi to L0, disabling the
hold release relay 648. The GAL 620 will reset, clear
the PGM, DRM, PGC, INT and HLD leads and recon
nect the handset 105 to the telephone line 101.
If the HLY lead is Hi the CLR lead will not change
state and the hold release relay 648 will remain active.
The GAL 620 will reset, clear the PGM, DRM, PGC,
accommodate left, right and left plus right speaker
hook-up con?gurations. Preferably, each speaker has its
choose input Ax and effectively mute the stereo inputs.
troller is accessed from said telephone by transmitting a
own volume control located within the room where
that speaker is placed.
As shown in FIG. 10, an audio transformer con?gu
ration 1002 is preferably used to provide volume con
trol. The ampli?ers 109 connect to the inputs 1004 of
the audio transformers 1002. The 10 position selector
INT and HLD leads.
switch 1006 provides adjustability from zero to full
The Hold Circuit 640 is released whenever one of
volume. The output of each audio transformer 1008
four conditions occurs: (1) the other party disconnects
(2) the Central Office releases the line (3) an extension 20 then feeds a corresponding speaker. Due to the use of
four Q speakers, the volume control audio transformer
goes “off hook” or (4) a default digit is dialed.
has a built-in six decibels of attenuation so that the impe
Referring now to FIG. 7, the signal selection/control
dance presented to the ADA system from each trans
circuit 180 is illustrated as including two 4053-type
former with a four 0 speaker is not less than sixteen (1.
multiplexor 702 and 704 and the pre-ampli?ers 188. If
no stereo signals are present, the threshold detection 25 Unless otherwise indicated, component values repre
sented by the same notation from the different ?gures
circuitry 174 of FIGS. 4-5 will supply a threshold con
trol signal 178.
(e.g., R1, C50) are the same.
What is claimed is:
Each identical left and right multiplexor 702 and 704
1. A signal distribution and communication arrange
is controlled by the mute function, the doorbell control
signal 186 and the page control signal 129 by the respec 30 ment for controlling broadcast of a plurality of different
types of signals through speakers located in various
tive A 0/ 1, B 0/0 and C 0/1 control inputs. As feed
inputs, each multiplexor 702 and 704 receives left or
zones, comprising:
a door speaker controller to a telephone to allow
right stereo signal feeds 176 (FIG. 4) at the Ay input,
communication between said telephone and a door
ground at the Ax input, the page signal 130 at the Bx
speaker;
input and the doorbell tone sequence 184 at the Cy
for broadcasting over said speakers located in various
input. The Cx input receives the A 0/1 output and the
zones from said telephone and thereafter muting
By input receives the C 0/1 output, with the B 0/1
the broadcast over said speakers located in various
output being provided to the pre-ampli?cation circuit
188 for priority control. Any audio received at the
zones to allow private communication;
said broadcasting circuit further including means for
output (B 0/ 1) 720 of the multiplexors is converted from
placing a phone call on hold when said broadcast
a single-ended signal to a balanced signal using the
ing said over said speakers located in various zones
conventional pre-ampli?cation circuitry 188 shown in
is originated.
FIG. 7.
2. The signal distribution and communication ar
In accordance with this con?guration, if the mute
switch 112 is closed, the multiplexors 702 and 704 will 45 rangement of claim 1, wherein said door speaker con
Otherwise, the multiplexors will pass the stereo signals
predetermined sequence of at least a single digit from
through to the output (A 0/1) 718, to the output (C 0/1)
720 and then to the output (B 0/ 1) 721 of the multiplex
said telephone.
ors.
rangement of claim 1, wherein communication between
If a doorbell control signal 186 is present, the multi
plexors will pass the doorbell tone sequence 184 to the
transmitting a predetermined sequence of at least a sin
3. The signal distribution and communication ar
said telephone and said door speaker is originated by
output (C 0/1) 720 and then to the output (B 0/ 1) 721 of
the multiplexor (provided the page control signal 186 is
gle digit from said telephone.
the output (B 0/1) 720.
originated by transmitting a predetermined sequence of
If a page control signal 129 is present, the multiplex
ors will pass the page signal 130 to the output (B 0/ 1)
721 of the multiplexor (regardless of the presence of any
other signals). If a page control signal 129 is not present,
the multiplexors will pass the output (C 0/1) 720 to the
at least a single digit from said telephone.
4. The signal distribution and communication ar
not present). If a doorbell control signal 186 is not pres 55 rangement of claim 1, wherein communication between
said telephone and said speakers in various zones is
ent, the multiplexors will pass the output (A 0/1) 718 to
5. The signal distribution and communication ar
rangement of claim 4, wherein said broadcast is muted
by transmitting a predetermined sequence of at least a
single digit from said telephone.
output (B 0/ 1) 720.
6. The signal distribution and communication ar
rangement of claim 1, wherein a call is placed on hold
FIG. 8 illustrates the power ampli?cation circuit 190
of FIG. 4 as including four identical LM675-type power 65 by transmitting a predetermined sequence of at least a
ampli?ers 810, 812, 814 and 816. The gain of each ampli
single digit from said telephone.
tier is 20. The resistor and capacitor values in the power
ampli?cation circuit 190 of FIG. 4 are preferably as
7. The signal distribution and communication ar
rangement of claim 1, wherein said phone call may be
11
5,363,434
resumed after said broadcasting is completed by trans
12
an audio receiver circuit which responds to a music
signal from an external music source, said audio
mitting a predetermined sequence of at least a single
digit from said telephone.
8. A signal distribution and communication arrange
ment for controlling the broadcast of a plurality of 5
different types of signals through speakers located in
receiver circuit including a threshold detection
circuit which provides a music mute function in
response to the music signal not exceeding a prede
termined signal magnitude;
various zones comprising;
an audio receiver for receiving a substantially contin
wherein the threshold detection circuit creates a
threshold detection control signal which disables
uously generated signal;
the music mute function in response to the music
a tone generator circuit, responsive to at least one
signals exceeding a predetermined signal magni
tude;
doorbell generator signal, for generating a prede
termined tone;
a page interface circuit, responsive to a page signal
a line interface circuit that is responsive to a page
generated from a telephone handset, which gener
signal received over associated signal lines;
an ampli?er circuit, coupled to the speakers, which
ampli?es at least the substantially continuously
ates a paging control signal, serves as a power
source to the telephone handset and processes an
audio signal from the telephone handset;
generated signal for broadcast through the speak
doorbell interface circuit responsive to a single
doorbell source that may be activated by any one
ers;
a control circuit which, in response to the audio re
ceiver, to the tone generator circuit and to the line
of a plurality of doorbell switches, said doorbell
interface circuit generating a doorbell control sig
interface circuit, controls which of the substan
nal and a two-tone sequence identifying the door
bell switch that activated the doorbell source;
tially continuously generated signal, the predeter
mined tone and the page signal should be broadcast
through the speakers;
means for connection to a door speaker to allow for 25
an amplifier circuit, coupled to the speakers, which
ampli?es the page signal, the music signal and said
one of the doorbell tone sequences for broadcast by
the speakers in each of the zones; and
a control circuit, responsive to the audio receiver
latching device by the said telephone; and
circuit and to the page and doorbell interface cir
means for broadcasting over said speakers located in
various zones from said telephone and for thereaf
cuits, which selects and couples one of the music
ter muting the broadcast over said speakers located
signal, the page signal and said two-tone sequence
to the ampli?er circuit.
in various zones to allow private communication;
said broadcasting means further including means for
16. A signal distribution and communication arrange
placing a phone call on hold when said broadcast
ment, according to claim 15, wherein the doorbell inter
ing over said speakers located in various zones is 35 face circuit includes a voltage controlled oscillator hav
originated.
ing a voltage which is sequentially varied, in response to
9. The signal and distribution and communication
said doorbell signal source, to produce said two-tone
arrangement of claim 8 wherein the communications
sequence.
module is activated from said telephone by transmitting
17. A signal distribution and communication arrange
predetermined sequences of at least a single digit from
ment, according to claim 16, further including a clock
communication between a door speaker and said
telephone and to permit the activation of a door
said telephone.
circuit which generates an oscillating signal, a se
10. The signal distribution and communication ar
rangement of claim 8, wherein communication between
quencer circuit which responds to the oscillating signal
by generating a sequence of output signals and a resistor
summation circuit which responds to the sequencer
said telephone and said door speaker is originated by
transmitting a predetermined sequence of at least a sin 45 circuit by providing a corresponding voltage to the
gle digit from said telephone.
voltage controlled oscillator.
11. The signal distribution and communication ar
18. A signal distribution and communication arrange
ment, according to claim 15, wherein the threshold
detection circuit provides a signal to the control circuit,
which signal indicates when the music signal is below a
rangement of claim 8, wherein communication between
said telephone and said speakers in various zones is
originated by transmitting a predetermined sequence of
at least a single digit from said telephone.
12. The signal distribution and communication ar
rangement of claim 11, wherein said broadcast is muted
prescribed signal magnitude.
19. A signal distribution and communication arrange
ment, according to claim 15, wherein the page interface
by transmitting a predetermined sequence of at least a
single digit from said telephone.
55
circuit equalizes the audio signal from the telephone
13. The signal distribution and communication ar
rangement of claim 8, wherein a call is placed on hold
by transmitting a predetermined sequence of at least a
handset.
20. A signal distribution and communication arrange
ment for controlling the broadcast of a plurality of
single digit on said telephone.
different types of signals, including audio signals from at
14. The signal distribution and communication ar 60 least one telephone handset, through speakers located in
rangement of claim 8, wherein said phone call may be
resumed after said broadcasting is completed by trans
mitting a predetermined sequence of at least a single
digit from said telephone.
15. A signal distribution and communication arrange 65
ment for controlling the broadcast of a plurality of
various zones, comprising:
an audio receiver circuit which responds to a music
signal from an external music source, wherein the
audio receiver circuit includes:
(a) a wall plate interface circuit with a signal inter
ruption switch and a gain adjust control for re
different types of signals through speakers located in
spectively interrupting and adjusting the gain of
various zones, comprising:
the music signal,
13
5,363,434
14
cludes means of providing each speaker with its own
volume control located near one of the speakers.
23. A signal distribution and communication arrange
ment for controlling the broadcast of a plurality of
(b) an automatic equalization circuit which com
pensates the music signal for reduced volume
levels and frequency response roll-off; and
(c) a threshold detection circuit which provides a
music mute function in response to the music
different types of signals through speakers located in
various zones, comprising:
signal not exceeding a predetermined signal
an audio receiver circuit which responds to a music
magnitude, wherein the threshold detection cir
signal from an external music source, said audio
receiver circuit including a threshold detection
circuit which provides a music mute function in
response to the music signal not exceeding a prede
cuit creates a threshold detection control signal
which disables the music mute function in re
sponse to the music signals exceeding a predeter
mined signal magnitude;
termined signal magnitude;
a page interface circuit, responsive to a short-lived
wherein the threshold detection circuit creates a
page signal and a page audio signal both generated
from said at least one telephone handset, which
threshold detection control signal which disables
the music mute function in response to the music
generates a paging control signal and serves as a
power source to the telephone in response to the
short-lived page signal being received and passes at
least the page audio signal from the telephone
handset, wherein the page line interface circuit 20
provides feedback control for the page audio signal
to prevent positive feedback of the page audio
signals exceeding a predetermined signal magni
tude;
a page interface circuit, responsive to a page signal
generated from a telephone handset, which gener
ates a paging control signal, serves as a power
source to the telephone handset and processes an
audio signal from the telephone handset;
signal;
a doorbell interface circuit responsive to a single
doorbell source that may be activated by any one 25
of a plurality of doorbell switches, said doorbell
a doorbell interface circuit responsive to a single
doorbell source that may be activated by any one
of a plurality of doorbell switches, said doorbell
interface circuit generating a doorbell control sig
nal and a two-tone sequence identifying the door
bell switch that activated the doorbell source;
interface circuit generating a doorbell control sig
nal and a two-tone sequence identifying the door
bell switch that activated the doorbell source;
an ampli?er circuit, coupled to the speakers, which
ampli?es the page signal, the music signal and said
an ampli?er circuit, coupled to the speakers, which
ampli?es at least the music signal and said two-tone
sequence for broadcast by the speakers in each of
one of the doorbell tone sequences for broadcast by
the speakers in each of the zones;
a control circuit, responsive to the audio receiver
the zones; and
a control circuit, responsive to the audio receiver
circuit and to the page and doorbell interface cir
cuits, which selects and couples one of the music
circuit and to the page and doorbell interface cir
cuits, which selects and couples one of the music
signal, the page signal and said two-tone sequence
to the ampli?er circuit;
signal, the page signal and said two-tone sequence
to the ampli?er circuit.
21. A signal distribution and communication arrange
ment, according to claim 20, wherein the control cir
a door speaker controller adapted to be connected to
a telephone to allow communication between said
telephone and a door speaker; and
means for broadcasting over said speakers located in
cuit, in response to more than one of the music signal,
various zones from said telephone and for thereaf
the page signal and said one of the doorbell tone sequen
ter muting the broadcast over said speakers located
ces being received together, prioritizes these signals so
in various zones to allow private communication.
that the page signal has highest priority, said two-tone 45 24. The signal and distribution and communication
sequence has intermediate priority and the music signal
arrangement of claim 3 wherein a door latching device
has lowest priority.
can be activated by transmitting a predetermined se
22. A signal distribution and communication arrange
quence of at least a single digit from said telephone.
ment, according to claim 20, wherein arrangement in
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65
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