Power line carrier multi telephone extension system for full duplex conferencing and intercom between telephones
First Claim
1. A power line RF carrier telephone extension system for signalling between (1) a telephone subscriber'"'"'s telephone line of a conventional telephone communication system wherein a separate telephone line is provided from a central switching system at one location to each subscriber at the subscriber'"'"'s location and each subscriber'"'"'s telephone line includes at least two wires, the ring line and the tip line and, (2) two or more of the subscriber'"'"'s extension telephones by RF carrier over the available power line at the subscriber'"'"'s location, including at the subscriber'"'"'s location or premises:
- a subscriber main (M) station near said subscriber telephone line and having access to said power line and two or more (up to N) subscriber extension stations (E1, E2 --En--EN), each having access to said power line, comprising,(a) at the M station;
(a1) detector means connected to the telephone line for detecting audio frequency signals on the telephone line, said detected signals referred to herein as TL signals,(a2) a transmitter for producing a main carrier frequency signal, Fm, and including modulating means in said transmitter modulating said Fm signal,(a3) N receivers, one for each of the En stations, each receiver for receiving a different one of the En stations transmitted RF carrier frequency signals, F1, F2 --Fn--FN, and said receiver including an Fn demodulator, for re-producing modulations of Fn at the output of the receivers,(a4) first combining means for combining the outputs of said N receivers to produce a combined receiver output signal referred to herein as MRXN,(a5) second combining means for combining the TL signals and MRXN signals and coupling the combined signals to the input of said transmitter, said transmitter input being referred to herein as MTX, and(a6) coupling means for coupling the transmitter output to the power line, and(a7) mode command means for producing an intercom mode command signal, herein referred to as the I signal, and wherein the second combining means comprises a multi-port hybrid network, referred to herein as the hydrid which is controlled by said I signal;
(a8) whereby, said MRXN and TL signals are combined by said hybrid and the combination is coupled to the input MTX of the transmitter and MRXN is coupled to the telephone line or the MRXN and TL signals are not so combined and MRXN is not coupled to the telephone line, depending upon the occurrence of said I signals;
whereby the power line carries the modulated Fm to the N E stations; and
(b) at each E station, denoted generally as En;
(b1) an En telephone,(b2) a source of power for the En telephone,(b3) said En telephone including means for producing audio and dial signals when it is used by the subscriber,(b4) an En receiver for receiving the modulated Fm from the power line, said En receiver including an Fm demodulator for re-producing the modulations of Fm in the output thereof, said output referred to herein as EnRX(b5) means for coupling the received modulated Fm from the power line to the input of the receiver, and(b6) means for coupling said EnRX from said En receiver to the En telephone,whereby the En telephone receives the TL and MRXN signals,(b7) an En transmitter including means for producing an En telephone carrier frequency signal, Fn, and modulating means in said En transmitter for modulating said Fn signal by the En telephone audio signals from the En telephone and signals representative of the En dial signals from the En telephone to produce a modulated Fn signal and(b8) means for coupling the modulated Fn signal to the power line,whereby the power line carries the modulated Fn to the main station and telephone calls from the telephone line can be answered by any of the E1, E2 --En--EN telephones and any or all of the E1, E2 --En--EN telephones can conference on a telephone line call.
3 Assignments
0 Petitions
Accused Products
Abstract
In a power line carrier telephone extension system for transmitting electrical signals between the telephone line and an extension telephone over the AC electric power line available at a telephone subscriber'"'"'s premises, that includes a main station for processing signals between the subscriber'"'"'s telephone line and power lines and two or more extension telephones of the system that plug into the power line, means that provides for two or more of the system telephones to communicate without going on the telephone line (Intercom), even while another system telephone is engaged in an outside telephone call and means are further provided for all telephones of the system to conference in Intercom.
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Citations
27 Claims
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1. A power line RF carrier telephone extension system for signalling between (1) a telephone subscriber'"'"'s telephone line of a conventional telephone communication system wherein a separate telephone line is provided from a central switching system at one location to each subscriber at the subscriber'"'"'s location and each subscriber'"'"'s telephone line includes at least two wires, the ring line and the tip line and, (2) two or more of the subscriber'"'"'s extension telephones by RF carrier over the available power line at the subscriber'"'"'s location, including at the subscriber'"'"'s location or premises:
- a subscriber main (M) station near said subscriber telephone line and having access to said power line and two or more (up to N) subscriber extension stations (E1, E2 --En--EN), each having access to said power line, comprising,
(a) at the M station; (a1) detector means connected to the telephone line for detecting audio frequency signals on the telephone line, said detected signals referred to herein as TL signals, (a2) a transmitter for producing a main carrier frequency signal, Fm, and including modulating means in said transmitter modulating said Fm signal, (a3) N receivers, one for each of the En stations, each receiver for receiving a different one of the En stations transmitted RF carrier frequency signals, F1, F2 --Fn--FN, and said receiver including an Fn demodulator, for re-producing modulations of Fn at the output of the receivers, (a4) first combining means for combining the outputs of said N receivers to produce a combined receiver output signal referred to herein as MRXN, (a5) second combining means for combining the TL signals and MRXN signals and coupling the combined signals to the input of said transmitter, said transmitter input being referred to herein as MTX, and (a6) coupling means for coupling the transmitter output to the power line, and (a7) mode command means for producing an intercom mode command signal, herein referred to as the I signal, and wherein the second combining means comprises a multi-port hybrid network, referred to herein as the hydrid which is controlled by said I signal; (a8) whereby, said MRXN and TL signals are combined by said hybrid and the combination is coupled to the input MTX of the transmitter and MRXN is coupled to the telephone line or the MRXN and TL signals are not so combined and MRXN is not coupled to the telephone line, depending upon the occurrence of said I signals; whereby the power line carries the modulated Fm to the N E stations; and (b) at each E station, denoted generally as En; (b1) an En telephone, (b2) a source of power for the En telephone, (b3) said En telephone including means for producing audio and dial signals when it is used by the subscriber, (b4) an En receiver for receiving the modulated Fm from the power line, said En receiver including an Fm demodulator for re-producing the modulations of Fm in the output thereof, said output referred to herein as EnRX (b5) means for coupling the received modulated Fm from the power line to the input of the receiver, and (b6) means for coupling said EnRX from said En receiver to the En telephone, whereby the En telephone receives the TL and MRXN signals, (b7) an En transmitter including means for producing an En telephone carrier frequency signal, Fn, and modulating means in said En transmitter for modulating said Fn signal by the En telephone audio signals from the En telephone and signals representative of the En dial signals from the En telephone to produce a modulated Fn signal and (b8) means for coupling the modulated Fn signal to the power line, whereby the power line carries the modulated Fn to the main station and telephone calls from the telephone line can be answered by any of the E1, E2 --En--EN telephones and any or all of the E1, E2 --En--EN telephones can conference on a telephone line call. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
- a subscriber main (M) station near said subscriber telephone line and having access to said power line and two or more (up to N) subscriber extension stations (E1, E2 --En--EN), each having access to said power line, comprising,
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19. A telephone extension system for signalling between a telephone subscriber'"'"'s telephone line of a conventional telephone communication system wherein a separate telephone line is provided from a central switching system at one location to each subscriber at the subscriber'"'"'s premises and two or more of the subscriber'"'"'s extension telephones over a two element transmission line at the subscriber'"'"'s premises, referred to herein as the premises transmission line, including at the premises:
- a main station (M) near the telephone line and having access to the two element transmission line and two or more extension stations (E1, E2 --En--EN), each having access to the two element transmission line, comprising,
(a) at the M station; (a1) detector means connected to the telephone line for detecting audio frequency signals on the telephone line, said detected signals referred to herein as TL signals, (a2) a transmitter for producing a main carrier frequency signal, Fm, and including modulating means in said transmitter for modulating said Fm signal, (a3) N receivers, one for each of the En stations, each receiver for receiving a different one of the En stations transmitted RF carrier frequency signals, F1, F2 --Fn--FN, and said receiver including an Fn demodulator, for re-producing modulations of Fn at the output of the receivers, (a4) first combining means for combining the outputs of said N receivers to produce a combined receiver output signal referred to herein as MRXN, (a5) second combining means comprising a mulitport hybrid network for combining the TL signals and MRXN signals and coupling the combined signals to the input of said transmitter, said transmitter input being referred to herein as MTX, and (a6) coupling means for coupling the transmitter output to the transmission line, and (a7) mode command means for producing an intercom mode command signal, herein referred to as the I signal to control the operation of the hybrid network such that the MRXN and TL signals are or are not combined and MRXN is or is not coupled to the telephone line, depending upon the occurrence of said I signal; whereby the premises transmission line carries the modulated Fm to the N E stations; and (b) at each E section, denoted generally as En; (b1) an En telephone, (b2) a source of power for the En telephone, (b3) said En telephone including means for producing audio and dial signals when it is used by the subscriber, (b4) an En receiver for receiving the modulated Fm from the power line, said En receiver including an Fm demodulator for re-producing the modulations of Fm in the output thereof, said output referred to herein as EnRX (b5) means for coupling the received modulated Fm from the premises transmission line to the input of the receiver, and (b6) means for coupling said EnRX from said En receiver to the En telephone, whereby the En telephone receives the audio signals, TL and MRXN, (b7) an En transmitter including means for producing an En telephone carrier frequency signal, Fn, and modulating means in said En transmitter for modulating said Fn signal by the En telephone audio signals from the En telephone and signals representative of the En dial signals from the En telephone to produce a modulated Fn signal and (b8) means for coupling the modulated Fn signal to the premises transmission line, whereby said line carries the modulated Fn to the main station and telephone calls from the telephone line can be answered by any of the E1, E2 --En--EN telephones and any or all of the E1, E2 --En--EN telephones can conference on a telephone line call. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
- a main station (M) near the telephone line and having access to the two element transmission line and two or more extension stations (E1, E2 --En--EN), each having access to the two element transmission line, comprising,
Specification