Data selector for demodulating chrominance signal

Details Data selector for demodulating chrominance signal Data selector for demodulating chrominance signal

1990-12-28

1992-07-21

Moore, David K.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 23, H04N 964, H04N 977

Patent

active

051327856

ABSTRACT:
A data selector capable of digitally separating I signal components from Q signal components of carrier chrominance signal in a NTSC system. The data selector of the present invention, using the fact that I and Q components of a carrier chrominance signal have mutual phase difference of 90.degree., drives a first set of buffers to have a phase difference of 90.degree. by a reference clock with a frequency of 4 times that of the carrier frequency, so that the I and Q components are sampled. The outputs of the buffers are output as the I and Q signals through a second set of buffers alternately driven with a frequency of twice that of the carrier frequency. As a result, a chrominance signal demodulator utilizing a simple circuit capable of achieving high speed data processing, miniaturization, and cost reduction can be provided.

REFERENCES:
patent: 4307414 (1981-12-01), Lee
patent: 4415918 (1983-11-01), Lewis, Jr.
patent: 4594607 (1986-06-01), Lewis, Jr. et al.
patent: 4700217 (1987-10-01), Balaban et al.

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