Television – Image signal processing circuitry specific to television – Color encoder or chrominance signal modulator
Patent
1993-08-05
1995-04-11
Groody, James J.
Television
Image signal processing circuitry specific to television
Color encoder or chrominance signal modulator
348639, 348640, H04N 1116, H04N 1112
Patent
active
054063353
ABSTRACT:
A PAL encoder comprises phase converter, first and second low-pass filters, a burst signal adder, a chrominance subcarrier generator, and a modulator. The phase converter converts digital first and second color-difference signals into digital U-axis and V-axis signals. The first and second low-pass filters pass low-frequency components of the digital U-axis and V-axis signals to produce band-rejected U-axis and V-axis signals, respectively. The burst signal adder adds a predetermined burst signal to the band-rejected U-axis and V-axis signals to produce burst-added U-axis and V-axis signals, respectively. The chrominance subcarrier generator outputs digital sine and cosine signals of the chrominance subcarrier. The modulator multiplies the burst-added U-axis signal by the sine signal and the burst-added V-axis signal by the cosine signal and adds the multiplied results to produce a digital chroma signal.
REFERENCES:
patent: 4349833 (1982-09-01), Clarke
patent: 4412181 (1983-10-01), Marguinaud et al.
patent: 4982179 (1991-01-01), Ogawa et al.
patent: 5159435 (1992-10-01), Holmbo et al.
patent: 5216496 (1993-01-01), Miyamoto et al.
Groody James J.
Metjahic Safet
NEC Corporation
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