Distortion correcting am steroe with non-flat agc

Details Distortion correcting am steroe with non-flat agc Distortion correcting am steroe with non-flat agc

H - Electricity

04

B

325/73, 332/86

H04B 1/16 (2006.01) H03G 3/20 (2006.01) H04H 5/00 (2006.01)

Patent

CA 1201172

DISTORTION CORRECTING AM STEREO RECEIVER WITH NON-FLAT AGC ABSTRACT OF THE INVENTION In a receiver for composite amplitude and angle modulated signals and having a non-flat automatic gain control characteristic, there is provided apparatus for providing distortion correction to the quadrature component produced by the angular modulation in accordance with the amplitude modulation component. In accordance with the invention, the output of an amplitude demodulator is modified to remove the carrier signal level dependent magnitude multiplier and develop a modification signal which is used to inversely amplitude modulate the quadrature signal component to provide distortion correction over a range of carrier signal levels. Such inverse modulation can be provided before or after quadrature demodulation of the received signal. -1-

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