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

1982-06-08

1984-12-18

Hickey, R. J.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

455307, H04H 500

Patent

active

044894317

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.

REFERENCES:
patent: 4169968 (1979-10-01), Parker
patent: 4192970 (1980-03-01), Kahn
patent: 4368356 (1983-01-01), Ecklund et al.
patent: 4379208 (1983-04-01), Isbell et al.

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