AM Stereo receiver logic

Details AM Stereo receiver logic AM Stereo receiver logic

1980-11-13

1983-04-05

Pellinen, A. D.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455194, H04H 500

Patent

active

043792081

ABSTRACT:
In an AM stereo radio receiver, a pilot signal is recovered from the phase modulated channel. The pilot signal is sensed by means of a bandpass filter tuned to the subaudible signal frequency and is used to operate a detector-switching amplifier combination. The switching amplifier actuates a visual indicator which shows the presence of a stereo broadcast. The receiver is provided with an electronic blend function that operates in response to the pilot signal and an excess phase signal that is present when the receiver is mistuned. OR Logic, which responds to either mistuning or a lack of stereo pilot signal, switches the receiver to monaural response. If desired, further OR Logic can include response to weak signals, in which case an improvement in signal to noise ratio is achieved.

REFERENCES:
patent: 4192968 (1980-03-01), Hilbert et al.
patent: 4332978 (1982-06-01), Streeter

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