DIGITAL VIDEO SIGNAL PROCESSING UNIT

摘要

PROBLEM TO BE SOLVED: To easily realize a digital zoom processing circuit that corrects an offset of a time base such as jitter or skew that is produced and adjusts a horizontal display rate in accordance with fluctuation in a horizontal period through a simple circuit configuration. SOLUTION: Reduced interpolation is applied to a digital video signal that is A/D converted and the digital is interleaved and written to a memory 3, and the signal is read from an interpolation processing circuit at a required clock rate. An arithmetic magnification controlled by a horizontal display rate control circuit 8 is given to an interpolation coefficient calculation circuit 6 to calculate an interpolation coefficient and controls a write control circuit 4 to conduct interpolation processing. Furthermore, Horizontal reference position control by the interpolation coefficient calculation circuit 6 is applied to obtain jitter of an integer part of an operating clock and jitter of a fraction part (phase component) is obtained by offsetting an interpolation coefficient of the interpolation coefficient calculation circuit 6 to realize jitter correction and horizontal zoom and horizontal direction display rate control at once by one interpolation circuit.