Apparatus for transmission of chrominance signals during blankin

Details Apparatus for transmission of chrominance signals during blankin Apparatus for transmission of chrominance signals during blankin

1977-01-21

1978-04-11

Richardson, Robert L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 4, H04N 932, H04N 708

Patent

active

040841812

ABSTRACT:
A color television signal processing apparatus is provided for reproducing a chrominance signal from a color television signal transmitted or recorded in such a manner that the chrominance signal is compressed in time scale and that the compressed chrominance signal is superposed on the horizontal blanking period signal of the color television signal in a time division manner. This apparatus includes a circuit for generating a clock pulse used for expanding the time scale of the compressed chrominance signal comprising a signal generator driven by a sample pulse derived from a reference signal in a color television signal and producing low and high frequency signals, a reset pulse generating circuit which compares a reference reset pulse derived from the reference signal with a comparison reset pulse generated from selfoscillating circuit, and a clock pulse generator driven by the output signals of the signal generator and the reset pulse generator. In this way, a correct clock pulse which may be used for expanding the compressed chrominance signal is obtained even when the reference signal in the color television signal temporarily disappears.

REFERENCES:
patent: 3781463 (1973-12-01), Bussche

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