Modulators – Amplitude modulator – Nonlinear device controlled by modulating signal
Patent
1974-12-23
1976-05-04
Grimm, Siegfried H.
Modulators
Amplitude modulator
Nonlinear device controlled by modulating signal
325136, 332 41, 332 45, 332 48, 358 23, H03C 152
Patent
active
039551555
ABSTRACT:
An amplitude modulation system suitable for use in television broadcasting is described. A video signal amplitude modulates a radio frequency carrier signal. The amplitude modulated signal is then filtered by a delay equalized vestigial sideband filter. The delay equalized amplitude modulated signal from the output of the vestigial sideband filter is envelope detected over a first path and is amplitude limited over a second path. The amplitude limited signal is applied to first and second phase modulators. The envelope detected signal is processed by a video processor to one of the phase modulators providing a phase shift at the one phase modulator equal to the arc cosine of the normalized envelope detected signal. The envelope detected signal is also processed by a video processor to the second phase modulator to provide a phase shift at the second phase modulator equal to the minus (-) arc cosine of the normalized envelope detected signal. The outputs from the two phase modulators are combined to provide an amplified, amplitude modulated, delay equalized vestigial sideband filtered signal.
REFERENCES:
patent: 3176246 (1965-03-01), Boiten
patent: 3229232 (1966-01-01), Sosin
patent: 3443229 (1969-05-01), Becker
patent: 3559070 (1971-01-01), Sharpe
patent: 3737809 (1973-06-01), Parkyn
Grimm Siegfried H.
Norton Edward J.
RCA Corporation
Troike Robert L.
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