Controlled blend for AM stereo receivers

Details Controlled blend for AM stereo receivers Controlled blend for AM stereo receivers

1986-04-01

1987-08-18

Isen, Forester W.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

381 10, H04H 500

Patent

active

046882545

ABSTRACT:
A control circuit in an AM stereophonic receiver examines a detected signal for occurrences of overmodulation and, when a first given level of overmodulation is reached, begins to turn down the correction signal used in the demodulation and, if overmodulation continues, would eventually eliminate the correction signal. At a second given level of overmodulation, the circuit will begin to attenuate the stereo difference signal from the receiver output and eventually eliminate it. When the overmodulation is reduced, operating conditions return toward normal.

REFERENCES:
patent: 4218586 (1980-08-01), Parker et al.
patent: 4371747 (1983-02-01), Hilbert
patent: 4375580 (1983-03-01), Sauer
patent: 4379208 (1983-04-01), Isbell et al.
patent: 4430747 (1984-02-01), Streeter

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