Apparatus for rejecting time base error of video signal

Details Apparatus for rejecting time base error of video signal Apparatus for rejecting time base error of video signal

1992-06-08

1994-04-12

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358310, 358324, H04N 989

Patent

active

053030613

ABSTRACT:
A time base correcting apparatus for reducing hindrance to a carrier chrominance signal due to clock jitter, when a sampling clock is generated by a digital circuit. In the time base correcting apparatus, a video signal is sampled with a clock synchronized with the video signal to be written to an FIFO memory. The video signal is then read out therefrom with a fixed clock to remove time base changes of the video signal. The fixed read clock is generated by multiplying two different frequency signals together, where one of the signals has a lower frequency approximately equal to (n+1/4) f (where n is an arbitrary integer, and f is a horizontal sync frequency) and using one of the resultant sidebands obtained through use of a bandpass filter. The read clock frequency is separated by 1/2 f from the other sideband frequency to reduce hindrance between the signals, and in turn to reduce viewable hindrances during the display of the video signal read out from the FIFO.

REFERENCES:
patent: 4212027 (1980-07-01), Lemoine
patent: 4714965 (1987-12-01), Yoshinaka et al.
patent: 4736238 (1988-04-01), Moriyama et al.
patent: 4754340 (1988-06-01), Nakagawa et al.
patent: 4860089 (1989-08-01), Smith
patent: 4860120 (1989-08-01), Yamashita
patent: 4987491 (1991-01-01), Kaite et al.

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