Television – Synchronization – Locking of video or audio to reference timebase
Patent
1994-05-31
1996-06-18
Kostak, Victor R.
Television
Synchronization
Locking of video or audio to reference timebase
348515, 348537, H04N 9475
Patent
active
055283080
ABSTRACT:
Direct synthesis of a digital audio sample clock from a digital video sample clock is achieved by using a numerically controlled oscillator driven by the digital video sample clock. A phase accumulator increments a phase increment at the frequency of the digital video sample clock, the phase increment being a function of a desired frequency for the digital audio sample clock, the frequency of the digital video sample clock and the bit precision of the accumulator. The accumulated phase output from the accumulator is converted into a sine wave signal at the desired audio frequency from which the digital audio sample clock is derived.
REFERENCES:
patent: 5028887 (1991-07-01), Gilmore
patent: 5281863 (1994-01-01), Bond et al.
patent: 5329253 (1994-07-01), Ichihara
patent: 5467294 (1995-11-01), Hu et al.
Alelyunas Carl
Poimboeuf Michael
Gray Francis I.
Johnson R. Brian
Kostak Victor R.
The Grass Valley Group Inc.
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