Digital time base corrector

Details Digital time base corrector Digital time base corrector

1994-12-16

1996-03-05

Groody, James J.

Television

Flutter or jitter correction

358326, H04N 595

Patent

active

054972000

ABSTRACT:
A digital time base corrector, when using a memory whose storage capacity is reduced to a value of about 1H of the video signal, can maintain an interleave relation between a luminance signal and a color signal of a video signal even when the writing operation into a memory is delayed by a jitter included in the demodulated video signal. When the read address is advanced from the write address in each of an image data memory and a subcarrier phase memory in one horizontal scan period, a discrepancy occurs between the polarity data read out from the subcarrier phase memory and the proper polarity data held in latch means. When such a discrepancy is detected, the color phase of the read-out image data is inverted. In starting the data reading operation for a new horizontal scan period, if it is detected that the operating mode has not shifted to the data writing operation for the new horizontal scan period, the color phase of the read-out image data is inverted for the new horizontal scan period.

REFERENCES:
patent: 4214262 (1980-07-01), Mizukami
patent: 4339770 (1982-07-01), Dennison et al.
patent: 4864387 (1989-09-01), Tatami
patent: 4987491 (1991-01-01), Kaite et al.
patent: 5245430 (1993-09-01), Nishimura

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