AM Stereo pilot signal detection circuitry

Details AM Stereo pilot signal detection circuitry AM Stereo pilot signal detection circuitry

1982-06-17

1985-03-05

Heyman, John S.

Electrical audio signal processing systems and devices

Hearing aids, electrical

Specified casing or housing

381 12, 381 13, 307522, H03K 902, H03D 104

Patent

active

045033978

ABSTRACT:
A stereo pilot signal detector for an AM stereo receiver connects an input signal to a train of pulses corresponding to zero crossings of the input signal. These pulse lock a shift register having a data input connected with a timer which is reset from the pulses after the shift register is clocked. The timer produces a logic "1" input to the register during a time interval extending on either side of the zero crossings of the stereo pilot signal. If four consecutive zero crossings occur within the window, the stereo decoder and an indicator are enabled. Thereafter, if three out of four zero crossings occur outside said interval, the stereo decoder and indicator are disabled.

REFERENCES:
patent: 2712065 (1955-06-01), Elbourn et al.
patent: 3585400 (1971-06-01), Brayton
patent: 3778638 (1973-12-01), Garratt
patent: 3943382 (1976-03-01), Hermansdorfer et al.
patent: 4344038 (1982-08-01), Streeter
patent: 4405837 (1983-09-01), Ecklund
patent: 4410762 (1983-10-01), Ecklund

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