System and method for performing an optimized inverse discrete c

Details System and method for performing an optimized inverse discrete c System and method for performing an optimized inverse discrete c

1996-06-20

1998-07-14

Chin, Tommy P.

Television

Bandwidth reduction system

Data rate reduction

348400, 348403, 348416, 348417, 348423, 348699, 358433, 36472502, H04N 736

Patent

active

057812390

ABSTRACT:
An MPEG decoder system and method an MPEG decoder system and method for decoding frames of a video sequence. The MPEG decoder includes IDCT computation logic which computes the IDCT with improved performance. The IDCT logic performs the inverse DCT based on the Chen algorithm for IDCT computation. The system and method of the present invention efficiently utilizes properties of the coefficients in optimizing the matrix multiply functions, thus providing improved performance. Chen's algorithm is commonly used to perform the two-dimensional IDCT. According to the Chen algorithm, the transform matrix I is defined as:
The Chen algorithm calculation can be written as:

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patent: 5394349 (1995-02-01), Eddy
patent: 5416522 (1995-05-01), Igarashi

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