Time base correction apparatus

Details Time base correction apparatus Time base correction apparatus

1992-12-24

1994-10-25

Groody, James J.

Television

Synchronization

Automatic phase or frequency control

348537, 348512, H04N 512

Patent

active

053593669

ABSTRACT:
An apparatus for compensating a time base error of a video signal. A reference signal of no time base error is generated. A difference between a frequency of the reference signal and a frequency of a horizontal synchronizing signal included in an input analog video signal is detected and then a difference signal is outputted. In response to the difference signal, a phase of the reference signal is controlled. The video signal is sampled, based on the reference signal the phase of which is controlled, thus the video signal is converted into a digital signal in which the difference is cancelled. The digital signal is stored in a memory. And the stored digital signal is read out, based on the reference signal.

REFERENCES:
patent: 4069499 (1978-01-01), Ninomiya
patent: 4110785 (1978-08-01), Dischert et al.
patent: 4673980 (1987-06-01), Murakami et al.
patent: 4714954 (1987-12-01), Yoshinaka et al.
patent: 4729013 (1988-03-01), Tatami et al.
patent: 4772950 (1988-09-01), Furuhata et al.
patent: 4987491 (1991-01-01), Kaote et al.
patent: 5072315 (1991-12-01), Tsunashima
Patent Abstracts of Japan, vol. 8, No. 80 (M-189) (1517), Apr. 12, 1984.

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