In-band signalling system for fm transmission systems

Details In-band signalling system for fm transmission systems In-band signalling system for fm transmission systems

H - Electricity

04

B

325/73

H04B 1/16 (2006.01) H04H 1/00 (2006.01) H04H 5/00 (2006.01)

Patent

CA 1181816

ABSTRACT The specification describes an automatic tone detecting apparatus for receiving a transmitted FM stereo multiplex signal containing at least one low frequency audio tone modulated substantially only on the 38 kHz subcarrier of the FM stereo signal. The apparatus includes means for detecting the existence of each low frequency tone and means responsive to the tone detection for activating an auxiliary circuit. The auxiliary circuit remains activated so long as the tone continues to be detected by the tone detector means.

391109

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