CELP coding with two-stage search over displaced segments of a o

Details CELP coding with two-stage search over displaced segments of a o CELP coding with two-stage search over displaced segments of a o

1997-02-12

1999-07-06

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704222, G10L 914

Patent

active

059208325

ABSTRACT:
In a CELP coder a comparison between a target signal and a plurality of synthetic signals is made. The synthetic signal is derived by filtering a plurality of excitation sequences from a one dimensional codebook by a synthesis filter having parameters derived from the target signal. The excitation signal which results in a minimum error between the target signal and the synthetic signal is selected. In order to reduce the complexity of the search for the best excitation signal, the selection is done in two stages. First a preselection of a small number of excitation sequences is made by selecting only every L.sup.th codebook entry for preselecting a plurality of excitation sequences. Thereafter, with this small number of excitation sequences, a full complexity search is made in which all excitation sequences surrounding the preselected ones are involved in the selection.

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patent: 5651090 (1997-07-01), Moriya et al.

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