Chroma noise reduction system for quadrature modulated color tel

Details Chroma noise reduction system for quadrature modulated color tel Chroma noise reduction system for quadrature modulated color tel

1981-11-25

1984-04-17

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 36, H04N 521

Patent

active

044438176

ABSTRACT:
The system includes a recirculating delay line signal path which feeds a fractional component of delayed chroma to a summing junction where it is combined in proper phase with undelayed chroma and the composite is ordinarily put out. In the event of a detected vertical transition in the luminance channel, a control signal is generated in proportion to the amplitude of the detected transition. The control signal is used to switch the output over to the input chroma in proportion to the amplitude thereof. The vertical transition may be detected in luminance or in chrominance, or both in which case the control signal is a combination of the two. The chrominance transition control signal may be inhibited in the absence of chroma in the combed chroma path.

REFERENCES:
patent: 3978409 (1976-08-01), Dolby
patent: 4064530 (1977-12-01), Kaiser
patent: 4107739 (1978-08-01), Rossi
patent: 4240105 (1980-12-01), Faroudja
patent: 4246610 (1981-01-01), Takahashi
patent: 4291333 (1981-09-01), Warnock
patent: 4355333 (1982-10-01), Sato

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