Title :
Online and offline computational reduction techniques using backward filtering in CELP speech coders
Author :
Johnson, Mark ; Taniguchi, Tomohiko
Author_Institution :
Fujitsu Lab. Ltd., Kawasaki, Japan
fDate :
8/1/1992 12:00:00 AM
Abstract :
The authors review the backward filtering algorithm and give a compact proof of its validity using matrix notation. They review the relation between backward filtering and offline perceptual weighting in sparse codebook CELP and show how a combination online/offline parallel weighting algorithm can be used to reduce the search complexity of an overlapped sparse codebook by 30% to 50%
Keywords :
computational complexity; encoding; filtering and prediction theory; speech analysis and processing; CELP speech coders; backward filtering algorithm; matrix notation; offline perceptual weighting; online/offline parallel weighting algorithm; overlapped sparse codebook; search complexity reduction; Filtering algorithms; Finite impulse response filter; IIR filters; Linear predictive coding; Signal processing; Signal processing algorithms; Signal synthesis; Sparse matrices; Speech processing; Stochastic processes;
Journal_Title :
Signal Processing, IEEE Transactions on
