Demodulator for sampled chrominance signals including a Nyquist

Details Demodulator for sampled chrominance signals including a Nyquist Demodulator for sampled chrominance signals including a Nyquist

1984-06-11

1986-06-10

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

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H04N 964

Patent

active

045946078

ABSTRACT:
Apparatus is disclosed for demodulating sampled data chrominance signals that include a first component that modulates a carrier to produce asymmetrical sidebands, and a second component modulated in quadrature to produce double sidebands. Samples representing the second component are derived and subtracted from the chrominance samples. The samples produced represent the asymmetrical sideband component. These samples are passed through a Nyquist filter to produce samples representing the first component signal but having the frequency spectrum of a vestigial sideband modulated signal. Demodulation of these samples by conventional means produces samples of the first component signal having a uniform range of amplitude values over the frequency band of the first signal.

REFERENCES:
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patent: 4205335 (1980-05-01), Nakagawa et al.
patent: 4389665 (1983-06-01), Nagao et al.
Stein, S. Schwartz M. S., & Bennett, W. R., Communications Systems and Techniques, McGraw Hill, 1966, pp. 187-193.

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