Signal processing method and device and video system

摘要

In a signal processing device for performing inverse orthogonal transform for a combination of orthogonal transform coefficients obtained by orthogonal-transforming a signal, a pixel signal value for a combination of orthogonal transform coefficients high in appearance is stored in advance in a pixel signal table together with an index assigned thereto. If a pixel signal value corresponding to a combination of orthogonal transform coefficients received via an input terminal is stored in the pixel signal table, an index generation circuit outputs a flag to a selection circuit and also outputs an index to the pixel signal table. The pixel signal table outputs the pixel signal value corresponding to the received index, and an image signal generation circuit generates a combination of pixel signal values as a restored signal. A selection circuit selects the output of the pixel signal generation circuit.