Time base corrector for video signal

Details Time base corrector for video signal Time base corrector for video signal

1992-12-10

1994-07-12

Powell, Mark R.

Television

Image signal processing circuitry specific to television

A/d converters

360 362, 348571, H04N 5907

Patent

active

053293665

ABSTRACT:
A time base corrector includes a main memory, a sub memory, and a passing detection circuit for generating a passing detection signal on the basis of the frequency difference between a write reference signal and a read reference signal. A memory control circuit controls the main and sub memories so that a field image immediately prior to a field in which passing will occur is written into both the main and sub memories. The written field image is read out from the sub memory when the field in which passing will occur is processed. Alternatively, the memory control circuit performs switching between a normal mode and a slip mode on the basis of the passing detection signal. In the normal mode, only the main memory is used. In the slip mode, both the main memory and the sub memory are integrally used for writing and reading of the video image.

REFERENCES:
patent: 4065787 (1977-12-01), Owen et al.
patent: 4445135 (1984-04-01), Heitmann et al.
patent: 4775899 (1988-10-01), Pasdera et al.
patent: 4862269 (1989-08-01), Sonoda et al.
patent: 4975788 (1990-12-01), Yamanishi

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