Time base corrector for video signal

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

1995-01-20

1996-09-17

Metjahic, Safet

Television

Synchronization

Locking of video or audio to reference timebase

358339, 360 362, H04N 595

Patent

active

055573355

ABSTRACT:
A time base corrector for video signal is disclosed in which a phase-locked loop is formed for a chroma carrier of a video signal so that a difficulty in detecting a phase error from a horizontal sync signal at an accuracy similar to the chroma carrier, in the vertical sync section having no chroma carrier and complexity of hardware in which the phase difference between the horizontal sync and chroma carrier should be considered, are overcome by employing a high gain loop filter and a clearing operation. Further, a read clock modulation is performed exactly at a time delayed in a FIFO memory according to a speed error generated in one line, using properties in which frequency variation corresponds to phase integration in one line in the frequency conversion characteristic of the digital timing oscillator. This simplifies the read clock phase modulator.

REFERENCES:
patent: 4802026 (1989-01-01), Kaneko et al.
patent: 4864422 (1989-09-01), Heitmann
patent: 4977462 (1990-12-01), Takanashi et al.
patent: 4987491 (1991-01-01), Kaite et al.
patent: 5218449 (1993-06-01), Ko et al.
patent: 5260839 (1993-11-01), Matsuta et al.
patent: 5280396 (1994-01-01), Hamaguchi et al.
patent: 5400148 (1995-03-01), Kashida et al.

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