Modulation distortion reducer

Details Modulation distortion reducer Modulation distortion reducer

1979-05-23

1981-05-19

Grimm, Siegfried H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

455126, 455295, 455 63, H03C 106

Patent

active

042688027

ABSTRACT:
A double-sideband amplitude modulated (DSBAM) carrier passed through band-pass circuits wich are too narrow for the modulated carrier or are misaligned, may have one or both side-bands altered in relative amplitude, or in phase relative to the carrier. These effects result in amplitude modulation distortion and produce angle modulation of the carrier, with the same waveform as the amplitude distortion. In this invention the angle modulation is detected and applied to an amplitude modulator in the required phase and amplitude to substantially eliminate the distortion of the modulated carrier.

REFERENCES:
patent: 3614669 (1971-10-01), Gargini
patent: 3831094 (1974-08-01), Stover

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