Amplitude modulation system

Details Amplitude modulation system Amplitude modulation system

1974-12-23

1976-05-11

Grimm, Siegfried H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

325136, 332 41, 332 45, H03C 150, H03C 160

Patent

active

039567150

ABSTRACT:
An amplitude modulation system suitable for use in television broadcasting is described including phase modulating means for phase modulating a carrier signal with an input signal to provide a first phase modulated signal having a phase according to the arc cosine of the amplitude of the input signal with the input signal normalized with unity at the maximum possible level thereof, the phase modulating means providing a second phase modulated signal having a phase according to the minus arc cosine of the amplitude of the input signal with the input signal normalized with unity at the maximum possible level thereof. The phase modulated output signals from the first and second modulators are processed over separate paths each including a delay equalized vestigial sideband filter. The two filtered, phase modulated signals processed over the two paths are amplified and then combined to provide an amplitude modulated, vestigial sideband filtered signal.

REFERENCES:
patent: 3176246 (1965-03-01), Boiten
patent: 3229232 (1966-01-01), Sosin
patent: 3443229 (1969-05-01), Becker
patent: 3737809 (1973-06-01), Parkyn

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