Method for performing an inverse modified discrete cosine transf

Details Method for performing an inverse modified discrete cosine transf Method for performing an inverse modified discrete cosine transf

1996-12-11

1998-12-08

Harrell, Robert B.

Boots, shoes, and leggings

G06F 1714

Patent

active

058479775

ABSTRACT:
A method of performing an inverse modified discrete cosine transform (IMDCT) which reduces the amount of calculation, in which IMDCT values y.sub.m (r) expressed in vector form as Y.sub.m =CX.sub.m, where Y.sub.m, C, and X.sub.m represent matrices are obtained by defining values of X.sub.k (m) for ##EQU1## calculating values of y.sub.m (r) for ##EQU2## with respect to an upper half of an upper portion of Y.sub.m by performing calculation with respect to an upper part of an upper portion of a left half of C and with respect to an upper half of X.sub.m ; calculating values of y.sub.m (r) with respect to a lower half of the upper portion of Y.sub.m by inverting the values of y.sub.m (r) with respect to the upper half of the upper portion of Y.sub.m and arranging the inverted values in a reverse manner; calculating the values of y.sub.m (r) for ##EQU3## with respect to an upper half of a lower portion of Y.sub.m by performing calculation with respect to an upper part of a lower portion of the left half of C and with respect to the upper half of X.sub.m ; and calculating values of y.sub.m (r) with respect to a lower half of the lower portion of Y.sub.m arranging values of y.sub.m (r) in a reverse manner with respect to the upper half of the lower portion of Y.sub.m.

REFERENCES:
"A Fast Algorithm for the Implementation of Filter Banks Based on Time Domain Aliasing Cancellation", ICASSP, 1991, pp. 2209-2212.
"Digital Audio Compression (AC-3)", ATSC, Dec. 20, 1995, pp. 1-6.

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