Remote-control system for coin-operated phonographs

Communications: electrical – Continuously variable indicating – With meter reading

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Details

194 15, 34082564, H04Q 900, H04B 132

Patent

active

044132603

ABSTRACT:
A coin-operated phonograph in which certain functions are remotely controlled. A transmitter is provided for transmitting a number of modulated carrier signals, including an up volume signal and a down volume signal. The phonograph carries a multi-channel receiver that is adapted for receiving the carrier signals transmitted by the transmitter. A detector is connected to the receiver for detecting the modulated carrier signals. An amplifier with gain control is provided and is controlled in accordance with receipt of the modulated carrier signals. A manually-operable volume control switch is carried by the phonograph and may be used instead of the transmitter to control the gain of the amplifier.

REFERENCES:
patent: 4056808 (1977-11-01), Benhamou
patent: 4127876 (1978-11-01), Schwartz
patent: 4228402 (1980-10-01), Plummer

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