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

H - Electricity

04

H

325/73

H04H 5/00 (2006.01)

Patent

CA 1130389

AP-78951 NOISE PROTECTION CIRCUIT FOR AM STEREO COSINE CORRECTION FACTOR ABSTRACT The cosine correction factor of a receiver for com- patible 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.

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