Signal interference protection circuit for am stereo receiver

Details Signal interference protection circuit for am stereo receiver Signal interference protection circuit for am stereo receiver

H - Electricity

04

B

325/73

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

Patent

CA 1196387

Abstract In the field of AM stereo detection, co-channel or adjacent channel interference may cause some distortion and side-to-side movement of a stereo signal source as well as false "stereo detect" signals in AM stereo receivers having phase locked loop (PLL) systems. The invention provides a filter receiving the incoming signal and passing only the frequencies resulting from said interference; a sensor measures the output of the filters and if this signal is above a given level, the monophonic mode is enabled, i.e., the pilot detector, the stereo presence indicator and the stereo mode switch are disenabled for a timed interval. A higher given level of interference is required for stereo disenablement when stereo transmission with pilot tone is already being received.

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