Time axis error correction device

Abstract

Abstract PURPOSE:To suppress a velocity error and to improve the time axis correction characteristic by controlling a delay of a variable delay line based on a delay quantity control signal corresponding to time axis fluctuation of an input video signal per one horizontal scanning line. CONSTITUTION:A voltage controlled triangle wave generator 25 generates a triangle wave of negative polarity and it is fed to a variable delay line 19 as a delay quantity control signal. The input video signal by the variable delay line is not delayed by the delay quantity control signal for a start of one horizontal scanning period and a phase at the left side of a monitor screen is not fluctuated. Then the delay quantity is gradually changed over one horizontal scanning period and the delay in response to the time axis fluctuation is given. Thus, since the fluctuation of the time axis appearing at the right end on the monitor screen for each horizontal scanning period is suppressed before being inputted to an A/D converter 1, a velocity error unable to be eliminated only by a time axis error correction device using an APC circuit is corrected.

Inventors

• 👤 Hiroshi Yamada
• 👤 浩 山田

Bibliographic Details