I.C. chroma injection and demodulation system

Details I.C. chroma injection and demodulation system I.C. chroma injection and demodulation system

1979-04-23

1980-12-02

Richardson, Robert L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 25, H04N 950, H04N 952

Patent

active

042374782

ABSTRACT:
An integrated injection and demodulation system is described for developing three color-difference signals in a color television receiver. To employ three separate demodulators, one for each color-difference signal, on a single integrated circuit chip without increasing the number of externally generated oscillator injection signals required, the system utilizes two such injection signals whose phases and amplitudes are such that their vector differences are employed to demodulate along one axis, and one of the injection signals is used to demodulate along a second axis. In addition, a fraction of one of the injected signals is developed inside the chip and vectorily subtracted from the other injection signal for demodulation by the resultant signal along the third color-difference axis.

REFERENCES:
patent: 3558810 (1971-01-01), Cecchin et al.

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