Television – Image signal processing circuitry specific to television – Color encoder or chrominance signal modulator
Patent
1997-05-28
2000-05-09
Le, Vu
Television
Image signal processing circuitry specific to television
Color encoder or chrominance signal modulator
348638, 348639, 348663, 348724, H04N 965, H04N 966, H04N 977, H04N 540
Patent
active
060611014
ABSTRACT:
An apparatus to modulate the digital color signal using a simple circuit that utilizes neither multiplier nor ROMs to multiplying a sine wave and cosine wave. The digital color signal modulating apparatus includes a first selector, a second selector 3, and a third selector. The first selector and the second selector provide the U signal component and the V signal component of the digital color signal to the third selector at a half cycle, rate respectively. The third selector alternately selects one of those signals, which is combined with the sub-carrier wave. For both modulations with the sine wave and with the cosine wave, the input signal is inverted and the fourth selector selects the outputs of the through path and the inversion path in turn, thus producing the modulated outputs.
REFERENCES:
patent: 4709257 (1987-11-01), Suzuki
patent: 4956701 (1990-09-01), Shioda
patent: 5242415 (1993-09-01), Mimura
patent: 5638135 (1997-06-01), Mukai
patent: 5870152 (1999-02-01), Fukatsu
Le Vu
OKI Electric Industry Co., Ltd.
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