Timebase corrector

Details Timebase corrector Timebase corrector

1991-02-07

1992-03-24

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358325, H04N 944

Patent

active

050993127

ABSTRACT:
A timebase corrector for a video signal is comprised of a reference clock signal generating means for generating, on the basis of a first synchronizing signal separated from a reference signal, a reference clock signal which is input to a first analog-to-digital converter for converting an analog input reference signal to a digital signal, a second clock signal generating means for generating a second clock signal which goes high level during a horizontal blanking period on the basis of a first clock signal whose frequency, multiplied by a desired integer, becomes a frequency of the reference clock signal, a line memory which can store an output signal of a second analog-to-digital converter which converts a correction analog signal to be corrected to a digital signal and a third clock signal generating means for generating a third clock signal by delaying the first clock signal in a timebase direction in which three-value reference phase sampling error, which results from sampling an output of the second analog-to-digital converter at a timing of a seond synchronizing signal separated from the correction analog signal in synchronism with the second clock signal is reduced, wherein the first and second clock signals are used as a read timing signal and a read reference signal of the line memory, respectively, while the third clock signal is used as a write timing signal of the line memory and is fed to the second analog-to-digital converter.

REFERENCES:
patent: 4485395 (1984-11-01), Warren
patent: 4714954 (1987-12-01), Yoshinaka et al.
patent: 4792846 (1988-12-01), Penny

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