Time base corrector

Details Time base corrector Time base corrector

1987-03-26

1988-12-13

Faber, Alan

Dynamic magnetic information storage or retrieval

Monitoring or testing the progress of recording

358339, 358 35, H04N 595

Patent

active

047914980

ABSTRACT:
A time base corrector for correcting time base fluctuations in a video signal is effective to remove both low frequency time base fluctuations and repetitive high frequency time base fluctuations repeating at the field period of the video signal. The time base corrector includes a memory having a plurality of addresses for storing residual phase error data corresponding to iundividual horizontal lines of each field period. A control circuit supplies corresponding residual phase error data from the memory to be used in compensating a present phase error signal whereby the high frequency time base fluctuations may be removed, and further mixes the present phase error signal with corresponding residual phase error data to generate new residual phase error data for storage in the memory in place of the original residual phase error data.

REFERENCES:
patent: 4214262 (1980-07-01), Mizukami
patent: 4373168 (1983-02-01), Mizukami
patent: 4393418 (1983-07-01), Kimura
patent: 4438456 (1984-03-01), Yoshinaka
patent: 4613827 (1986-09-01), Takamori
patent: 4668998 (1987-05-01), Aoki
patent: 4680658 (1987-07-01), Tatami
patent: 4688111 (1987-08-01), Kani
patent: 4714965 (1987-12-01), Yoshinaka
patent: 4733311 (1988-03-01), Yoshinaka
patent: 4733312 (1988-03-01), Morimoto
Acker & McLean, Digital Time-Base Correction for Video Signal Processing, Mar. 1976, pp. 146-150; SMPTE Journal.
Hedlund, The TR-800VTR, Mar. 1981, pp. 18-26, International Broadcast Engineer.

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