Suppression of chrominance signal contamination of the luminance

Details Suppression of chrominance signal contamination of the luminance Suppression of chrominance signal contamination of the luminance

1977-12-12

1979-09-04

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 31, 358 39, H04N 9535

Patent

active

041670213

ABSTRACT:
Apparatus in a video signal processing system for improving the quality of a color image reproduced by a color kinescope in response to chrominance and luminance components of the video signal, the chrominance signal being subject to phase transitions likely to generate chrominance subcarrier components sufficient to contaminate the luminance signal. Chrominance signals delayed by an amount corresponding to an interval during which the phase transitions can occur are supplied to inputs of a signal multiplier, which provides an output signal indicating the presence of chrominance phase transitions. The multiplier output signal is utilized for controlling the luminance signal processing channel to suppress the sideband signals, thereby also suppressing objectionable effects of the sideband signals otherwise visible in a reproduced image.

REFERENCES:
patent: 3778543 (1973-12-01), Lowry
patent: 3836707 (1974-09-01), Murakami et al.
patent: 4030121 (1977-06-01), Faroudja
Barton, "A Practical Charge-Coupled Device Filter for the Separation of Luminence and Chrominance Signals. . .", IEEE Trans. on Consumer Electronics, vol. CE-23, No. 3, Aug. 1977, pp. 342-357.
Turner, "Some Thought on Using Comb Filters in the Broadcast Television Transmitter and at the Receiver", IEEE Trans. on Consumer Electronics, vol. CE-23, No. 3, Aug. 1977, pp. 248-257.

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