Fast system and method for computing modulated lapped transforms

Details Fast system and method for computing modulated lapped transforms Fast system and method for computing modulated lapped transforms

1998-06-03

2000-11-28

Malzahn, David H.

Electrical computers: arithmetic processing and calculating

Electrical digital calculating computer

Particular function performed

G06F 1714

Patent

active

06154762&

ABSTRACT:
The present invention is embodied in a system and method for fast computation of a spatial transform of an input signal. The computation system includes a window processor having a window function and an operator having a first set of weights. The window processor receives the input signal as sample blocks and the operator is adapted to apply butterfly coefficients determined by the window function to produce resulting vectors. Also, the window processor maps the input signal to a cascade of butterflies using the first set of weights and reorders the cascade of butterflies. A transform processor having a transform module computes a spatial transform from the reordered cascade of butterflies to produce transform coefficient. A coefficient combination operator combines the transform coefficients to produce an encoded output corresponding to the input signal.

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patent: 5859788 (1999-01-01), Hou
P. Duhamel, Y. Mahieux, and J.P. Petit, "A Fast Algorithm For The Implementation Of Filter Banks Based On Time Domain Aliasing Cancellation," Proc. IEEE ICASSP, Toronto, Canada,May 14-17, 1991, pp. 2209-2212.
D. Sevic and M. Popovic, "A New Efficient Implementation Of The Oddly Stacked Princen-Bradley Filter Bank," IEEE Signal Processing Letters., vol. 1, No. 11, pp. 166-168, Nov. 1994.
C.W. Kok, "Fast Algorithm For Computing Discrete Cosine Transform," IEEE Trans. Signal Processing, vol. 45, No. 3, pp. 757-760, Mar. 1997.

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