Television – Synchronization – Locking of video or audio to reference timebase
Patent
1996-10-03
1999-05-25
Peng, John K.
Television
Synchronization
Locking of video or audio to reference timebase
348513, 348536, 348537, 348542, 386 34, H04N 9475, H04N 979, H03L 700
Patent
active
059073683
ABSTRACT:
Vertical and horizontal sync signals are separated from an NTSC signal inputted from an outside by an external input circuit and a luminance signal (Y) and chrominance signals (B-Y, R-Y) are extracted and converted into RGB data. External RGB data and RGB data formed by a software are processed and the resultant data is supplied to an output converting circuit. The RGB data is converted into analog signals of the luminance signal and chrominance signals of a television signal by using individual system clock signals and outputted. A clock generating circuit generates two kinds of dot clocks which are used for the output converting circuit. The dot clock which is generated from the clock generating circuit and is used for conversion of the luminance signal is phase matched so as to follow a jitter of a horizontal sync signal (H) separated by an external video input circuit.
REFERENCES:
patent: 4727432 (1988-02-01), Hosaka
patent: 4851910 (1989-07-01), Kawai et al.
patent: 5200834 (1993-04-01), Iawaibana et al.
patent: 5280345 (1994-01-01), Uehara et al.
patent: 5400148 (1995-03-01), Kashida et al.
patent: 5475440 (1995-12-01), Kobayashi et al.
Fujita Ken-ichi
Nakamura Satoshi
Peng John K.
Sajous Wesner
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