Patent ID: 8390738

Claim:
A video apparatus for processing an input video signal in synchronization with an external reference signal, comprising: a phase compensation FIFO memory to which the input video signal is written in synchronization with a clock demodulated from the input video signal and from which the video signal is read in synchronization with an internal reference clock of the apparatus generated from the external reference signal; and measuring means for measuring an amount of jitter/wander of the input video signal based on a calculation of a difference between data volume of the video signal obtained in the FIFO memory and a predetermined reference volume, wherein the data volume of the video signal obtained in the FIFO memory is obtained using the clock demodulated from the input video signal as a writing clock and the internal reference clock generated from the external reference signal ref as a reading clock, wherein a maximum value is obtained as a peak hold value by setting a long hold time and not clearing the peak hold value even in a case where less frequent jitter/wander occurs or unexpected jitter/wander occurs, thereby allowing the jitter/wander occurring less frequently and the jitter/wander occurring unexpectedly to be measured.