Modulated RF carrier distributing arrangement for key telephone

Details Modulated RF carrier distributing arrangement for key telephone Modulated RF carrier distributing arrangement for key telephone

1977-10-27

1979-04-10

Cooper, William C.

H04M 172

Patent

active

041490428

ABSTRACT:
A modulated RF carrier signal distributing arrangement, utilizing existing line circuits, is disclosed for providing entertainment signals to key telephone lines in the active noncommunicating (hold) state. The disclosed system utilizes an existing option connector on the line circuit for connection of a music receiver circuit. A centrally located transmitter circuit frequency modulates its own RF carrier with an externally supplied music signal and is wired to the existing common dc power to distribute the modulated RF signals to the receiver via the option connector on each line circuit. The receiver circuitry demodulates the RF signal and couples the resulting music signal directly across the hold bridge leads of the associated line.

REFERENCES:
patent: 3246082 (1966-04-01), Levy
patent: 3400221 (1968-09-01), Wolters
patent: 3794774 (1974-02-01), Kemmerly et al.
patent: 3895192 (1975-07-01), Angner et al.
patent: 3925625 (1975-12-01), Angner et al.
patent: 3965308 (1976-07-01), Jones et al.
patent: 4013840 (1977-03-01), Anderson
patent: 4056695 (1977-11-01), Angner et al.
patent: 4066847 (1978-01-01), Giordano

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