Method and apparatus for implementing a long-term synthesis filt

Details Method and apparatus for implementing a long-term synthesis filt Method and apparatus for implementing a long-term synthesis filt

1996-04-29

1998-06-02

Tung, Kee M.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704220, 704219, 704263, 704262, G10L 302

Patent

active

057616353

ABSTRACT:
A synthesis filter is disclosed which models the effect of the fundamental frequency of speech for digital speech coders operating on the analysis-by-synthesis principle. High fundamental frequencies having a period shorter than the corresponding cycle length of the frame employed in the analysis-by-synthesis method are optimally encoded. The filter is constructed of a number of parallel, separately updatable synthesis-memory blocks. When analysis delays shorter than the analysis frame are used, a portion of a signal that was stored in memory several frames earlier is selected and scaled to approximate the missing portion of the analysis frame using the available portion of the analysis frame.

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