DEVICE FOR EXECUTING HIGH-SPEED AND LOW-POWER INVERSE DISCRETE COSINE TRANSFORM COMPUTATION BY USING RELATIVE OCCURRENCE OF ZERO DCT COEFFICIENT

摘要

PROBLEM TO BE SOLVED: To provide a device for executing high-speed and low-power inverse discrete cosine transform computation by using the relative occurrence of zero DCT coefficients.

SOLUTION: Two one-dimensional inverse discrete cosine transforms (1-D IDCT) are executed to realize high-speed and low-power two-dimensional inverse discrete cosine transform computation important for MPEG decompression in battery-driven mobile communication. The first 1-D IDCT is executed in rows of a DCT-transformed coefficient data matrix, and the next is executed at variable speed in columns of the 1-D IDCT-transformed data matrix by using the occurrence of zero data. The 1-D IDCTs are computed by a series of maximum arithmetic computation steps corresponding to a high-speed 1-D IDCT algorithm realized in an assigned time.

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