Apparatus for decoding a PAL standard color television signal

Details Apparatus for decoding a PAL standard color television signal Apparatus for decoding a PAL standard color television signal

1986-11-05

1987-11-10

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 18, 358 24, H04N 945, H04N 9465

Patent

active

047061103

ABSTRACT:
The synchronously demodulated chrominance signals (C.sub.1d, C.sub.2d) each alternately represent, line by line, the sum and difference of the color difference signals U and V. They are supplied to a multiplexer (21) switched by a meander wave having a 2H oscillation period and supplied therefrom to an accumulator for evaluation of the synchronizing color carrier bursts. During the burst, a succession of sampling frequency pulses sample the burst portion of one chrominance signal (C.sub.2d) with the results being added in an accumulator and then loaded in a first register (25) to provide a control signal for the color carrier oscillator and from the burst portion of the other chrominance signal (C.sub.1d) a potential is similarly produced by the accumulator, loaded in a second register (26) and evaluated in a PROM to determine whether the switching of the reversal circuit or one of the color difference signals (V) is timed for the correct horizontal line or for the wrong one. In the latter case, the meander wave is held for a half period of its oscillation which in effect inverts it, thereby correcting its timing.

REFERENCES:
patent: 4349833 (1982-09-01), Clarke
patent: 4527145 (1985-07-01), Haussmann et al.

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