Direct synthesis of a digital audio sample clock

Details Direct synthesis of a digital audio sample clock Direct synthesis of a digital audio sample clock

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.

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