DISCRETE SINE TRANSFORM CIRCUIT, INVERSE DISCRETE SINE TRANSFORM CIRCUIT, COMBINATION-USE CIRCUIT, ENCODING DEVICE, DECODING DEVICE, AND PROGRAM

摘要

PROBLEM TO BE SOLVED: To suppress cost and power consumption by realizing DST or IDST using a widespread existing DCT circuit or IDCT circuit respectively.;SOLUTION: Inversion elements 10-1 and 10-2 of a DST circuit 1-1 input a signal g(x) corresponding to odd-numbered x among signals g(x), and invert its sign. A DCT circuit 11 inputs the first signal g(0) and the third signal g(2) among the signals g(x) parallelized in a unit of four points, and inputs the second signal g(1) and the fourth signal g(3) whose signs are inverted from the inversion elements 10-1 and 10-2. Then, the DCT circuit 11 performs DCT in a unit of four input points using an operational expression of DCT. Thereby, DST can be realized using the DCT circuit 11.;COPYRIGHT: (C)2012,JPO&INPIT