Carrier current transceiver

Details Carrier current transceiver Carrier current transceiver

1984-10-09

1987-10-20

Lev, Robert

Telephonic communications

Audio message storage, retrieval, or synthesis

379 64, 340310A, H04M 1100

Patent

active

047019450

ABSTRACT:
A carrier current telephone system is provided for buildings. Transceivers are located where desired. The transmitter portion includes means for establishing a carrier signal and applying the same to the AC circuits in the building. Further means are provided for generating a subcarrier signal which is encoded on the carrier signal by frequency modulation of the carrier. Further means are provided for encoding the audio or data signal upon the subcarrier signal by frequency modulation of the subcarrier. Exclusive-OR gates are used in a voltage controlled oscillator for the subcarrier signal generator. Unique phase lock loop FM demodulators are used. Each comprises one CMOS 4070B exclusive-OR gate package, five resistors, one potentiometer, and three capacitors, with one of the exclusive-OR gates performing the phase detector function.

REFERENCES:
patent: 3478169 (1969-11-01), Saite
patent: 3909618 (1975-09-01), Fujii et al.
patent: 3949172 (1976-04-01), Brown et al.
patent: 4058678 (1977-11-01), Dunn et al.
patent: 4495386 (1985-01-01), Brown et al.
patent: 4514594 (1985-04-01), Brown et al.
patent: 4534054 (1985-08-01), Maisel

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