DIGITAL SIGNAL COMPRESSION METHOD AND CIRCUIT, AND DIGITAL SIGNAL EXPANSION METHOD AND CIRCUIT

摘要

PROBLEM TO BE SOLVED: To provide a digital signal compression method and circuit capable of furthermore reducing an information quantity in an image signal before compression and to provide a digital signal expansion method and circuit. SOLUTION: This digital signal compression circuit include: a basic frame memory 19 for storing basic frames; a subtractor 1 for receiving an image signal as one of inputs; an intra/inter encoding control section 30 for receiving a current image signal and the basic frame signal and discriminating whether or not a difference is to be taken by each of a plurality of macro blocks resulting from dividing a frame; and a selector 33 for receiving an output of the intra/inter encoding control section 30 and outputting the basic frame signal to the subtractor 1 when the intra/inter encoding control section 30 discriminates to take a difference or outputting zero to the subtractor 1 when the intra/inter encoding control section 30 discriminates to take no difference. COPYRIGHT: (C)2003,JPO