Modulation frequency response stabilized amplitude modulation ci

Details Modulation frequency response stabilized amplitude modulation ci Modulation frequency response stabilized amplitude modulation ci

1989-10-31

1990-07-03

Pascal, Robert J.

Modulators

Amplitude modulator

Including stabilization or alternatively distortion, noise...

455126, H03C 106

Patent

active

049394835

ABSTRACT:
A frequency response stabilized amplitude modulation circuit includes a variable gain amplitude modulator producing an output signal having an amplitude proportional to a product of amplitudes of input carrier, modulating and gain control signals. An envelope detector generates a signal having an amplitude responsive to the modulation envelope of the output signal. A first difference amplifier produces the modulating signal input to the amplitude modulator in proportion to a difference between amplitudes of the envelope detection signal and an audio input signal. The modulating signal incorporates negative feedback to ensure the envelope amplitude of the modulated output signal tracks the audio input. A second difference amplifier provides the gain control signal input for the amplitude modulator in accordance with a difference between amplitudes of the modulating signal, scaled by a constant factor, and the envelope detection signal. The second difference amplifier minimizes influence of carrier signal frequency on modulation frequency response by accordingly adjusting the gain of the modulation circuit.

REFERENCES:
patent: 3662290 (1972-05-01), Elliott

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