Noise protection circuit for AM stereo cosine correction factor

Details Noise protection circuit for AM stereo cosine correction factor Noise protection circuit for AM stereo cosine correction factor

1978-01-27

1979-10-02

Olms, Douglas W.

325346, H04H 500

Patent

active

041699688

ABSTRACT:
The cosine correction factor of a receiver for compatible AM stereo reception is controlled by the amount of high frequency energy present in the demodulated signal. Large amounts of such energy indicate a low signal-to-noise ratio and cosine correction under such conditions is then not desirable. During periods of excessive high frequency energy, a filter circuit output causes a switching circuit to remove the derived cosine correction factor and cause division of the demodulated signal by a factor of one instead.

REFERENCES:
patent: 3068475 (1962-12-01), Avins
patent: 3080453 (1963-03-01), Avins
patent: 3534172 (1970-10-01), Weeda
patent: 4018994 (1977-04-01), Kahn
patent: 4037057 (1977-07-01), Ogita et al.

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