H - Electricity – 03 – C
Patent
H - Electricity
03
C
332/77
H03C 1/00 (2006.01)
Patent
CA 1211803
ABSTRACT OF THE DISCLOSURE The present invention provides an inverse amplitude modulator for use in a receiver to provide distortion of the quadrature modulation component of a signal received at the receiver. The inverse amplitude modulator has a modulation characteristic of the form Image with respect to a supplied modulating signal (B) and a supplied signal (A) which is to be inversely modulated. The modulator supplies a first signal comprising the modulating signal (B) and a DC component in the form of (1+B) and a second signal comprising the (A) signal to be modulated for logarithmically amplifying the first signal and for developing a third signal (C) comprising substantially only the AC components of the logarithmically amplified signal. The modulator has a modulation characteristic of the form A(1-.5C), for inversely modulating the second signal (A) by the third signal (C), whereby with respect to the supplied signals (A) and (B), the combination exhibits a modulation characteristic substantially of the desired form Image
482065
Hazeltine Corporation
Johnson Douglas S. Q.c.
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