Television – Receiver circuitry – Sound circuit
Patent
1993-12-27
1995-05-23
Groody, James J.
Television
Receiver circuitry
Sound circuit
348608, 348680, H04N 540
Patent
active
054185785
ABSTRACT:
A circuit is provided for precorrecting an aural carrier signal in a common amplifier system in a television transmitter wherein an aural frequency signal and a visual signal are commonly amplified. The precorrecting serves to minimize cross-modulation distortion of the aural carrier caused by the common amplification. A visual carrier signal is modulated by a video baseband signal to provide a modulated video signal from which there is provided a sampled video signal. This sampled video signal is supplied to an aural corrector which provides from the sampled video signal a phase correction signal and an amplitude correction signal. The phase correction signal and amplitude correction signal are used to modulate an aural carrier signal to provide a precorrected aural signal which is then combined with the video signal to provide a combined signal.
REFERENCES:
patent: 4591915 (1986-05-01), Davidov et al.
patent: 4672452 (1987-06-01), Corbel et al.
patent: 5198904 (1993-03-01), Ta et al.
Groody James J.
Harris Corporation
Murrell Jeffrey S.
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