Digital television-signal-processing circuit with orthogonal out

Details Digital television-signal-processing circuit with orthogonal out Digital television-signal-processing circuit with orthogonal out

1991-03-29

1992-09-22

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 17, 358149, 358320, 358337, 358 13, H04N 504, H04N 989, H04N 595

Patent

active

051502011

ABSTRACT:
A digital television-signal-processing circuit for a composite color signal is sampled with a first clock signal. The digitized composite color signal is reconverted with a line-locked second clock signal. The two clock signals have the same frequency. A second phase-locked loop for controlling the phase of the horizontal pulse includes a locked oscillator and is loosely coupled to a first phase-locked loop which generates a horizontal reference clock. The decoupling of the data, which is referred to the two clock signals, takes place in a dual-port read/write memory which is written into synchronously with the first clock signal and read from synchronously with the second clock signal.

REFERENCES:
patent: 4646151 (1987-02-01), Wells, II et al.
patent: 4870661 (1989-09-01), Yamada et al.

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