Method of synchronization of a digital video signal and device f

Details Method of synchronization of a digital video signal and device f Method of synchronization of a digital video signal and device f

1996-02-12

1998-04-28

Lee, Michael R.

Television

Synchronization

Locking of video or audio to reference timebase

348512, H04N 9475

Patent

active

057451850

ABSTRACT:
The disclosure relates to a synchronization device that includes two parallel memory areas, a unit for determination of write states that depends on the phase deviation between the input video signal and the synchronization signal, a write management unit that determines, when it receives a write image pulse, the memory (or memories) to be used for the next write depending on the write state and the memory that is currently being read. The two memories are read sequentially and alternately, whereas the memory(ies) used for each write is variable and determined automatically. The invention enables video signals to be synchronized with respect to a synchronization signal with a frequency deviation tolerance of up to 33%.

REFERENCES:
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patent: 4231063 (1980-10-01), Ito et al.
patent: 4646136 (1987-02-01), Kouyama
patent: 4646151 (1987-02-01), Welles et al.
patent: 4689676 (1987-08-01), Nakajima et al.
patent: 4766495 (1988-08-01), Kobayashi et al.
patent: 4816915 (1989-03-01), Imai et al.
Patent Abstracts of Japan, vol. 018, No. 441 (P-1788), Aug. 17, 1994, & JP-A-06 139133 (Sony Corp), May 20, 1994.

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