Idle-busy signalling between telephone system and radiophone...

Details Idle-busy signalling between telephone system and radiophone... Idle-busy signalling between telephone system and radiophone...

H - Electricity

04

Q

379/11, 325/30

H04Q 7/38 (2006.01)

Patent

CA 1075839

Abstract An interface unit for use between a telephone system in which a single-frequency tone is transmitted in both directions when the circuit is on-hook (idle) and a single-channel-per-carrier radio system in which the radio frequency carrier is not transmitted when the circuit is idle. A transmitting portion includes a single-frequency tone detector means responsive to termination or initiation of the tone from the telephone system to turn on the radio frequency carrier. A receiving portion includes a radio frequency carrier detector means operative to switch the telephone system from the output of a local single frequency local oscillator to a voice frequency line from the radio system, and a single frequency detection means to switch the telephone system back to the output of the local single frequency oscillator. -1-

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