Color television receivers

Details Color television receivers Color television receivers

1979-08-30

1981-08-11

Richardson, Robert L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 21R, 358 23, H04N 950

Patent

active

042837391

ABSTRACT:
In a color television receiver, especially for NTSC or PAL color television signals, the intermediate frequency is a phase-lock integral multiple of the sub-carrier frequency. Preferably the intermediate frequency is 4N times the sub-carrier frequency, where N is an integer. The receiver may include a crystal controlled oscillator phase locked to a multiple of the color burst frequency, the oscillations from the oscillator compared with the intermediate frequency and the result of the comparison used to control the frequency of a local oscillator. The oscillations from the crystal controlled oscillator may be used directly for synchronous demodulation of the intermediate frequency signal to give a Y or Y-chroma signal and after addition of a signal of sub-carrier frequency and suitable phase adjustment for synchronous demodulation to give U- and V- signals. Alternatively, the crystal oscillator oscillation and a signal of sub-carrier frequency derived from it may be used separately to give the U- and V- signals.

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