Improving the adaptive codebook delay selection for FS-1016 CELP

A limitation of the US federal standard 1016 CELP is the occurrence of adaptive delay estimation errors, particularly in the voiced/unvoiced transition areas. Delayed decision is applied in the analysis by synthesis loop of the analyzer to improve the selection of the adaptive delay, and the corresp...

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Bibliographic Details
Main Authors: Andrews, W.D., Teague, K.A.
Format: Conference Proceeding
Language:English
Subjects:
Code standards
Delay estimation
Matched filters
Minimization
Signal synthesis
Speech analysis
Speech coding
Speech synthesis
Stochastic processes
Synthesizers
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Summary:A limitation of the US federal standard 1016 CELP is the occurrence of adaptive delay estimation errors, particularly in the voiced/unvoiced transition areas. Delayed decision is applied in the analysis by synthesis loop of the analyzer to improve the selection of the adaptive delay, and the corresponding gain, by minimizing the weighted error criterion over the entire analysis frame instead of over the subframe. Full interoperability with the FS-1016 CELP standard is maintained.
DOI:10.1109/MWSCAS.2000.952824