Television receiver including a circuit arrangement for demodula

Details Television receiver including a circuit arrangement for demodula Television receiver including a circuit arrangement for demodula

1986-03-04

1987-12-01

Chin, Tommy P.

Facsimile and static presentation processing

Static presentation processing

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358 23, H04N 966

Patent

active

047108029

ABSTRACT:
A color television signal receiver includes a circuit arrangement for demodulating an NTSC-encoded chrominance signal available as a sequence of digital values. An oscillator circuit (33), which has an accumulator (16) and a waveform converter (31) produces two sine-shaped reference signals which are applied to a demodulator circuit (2). The accumulator (16) includes a register (18) and a (first) modulo-adder (17). A phase comparator circuit (12) controlling the phase of the reference signal receives at least one demodulated signal during the occurrence of the color synchronizing signal. The sawtooth-shaped accumulator output signal is added in a second adder (26, 38) during a first switching position of a change-over switch (23, 34) to an adjustable value and is thereafter applied to the waveform converter (31). In the second switching position of the change-over switch (23, 34), which only occurs during the occurrence of the color synchronizing signal, the accumulator output signal is applied unchanged to the waveform converter (31).

REFERENCES:
patent: 4278994 (1981-07-01), van der Valk
patent: 4546378 (1985-10-01), Annegarn
patent: 4625232 (1986-11-01), Nillesen

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