Data processing: speech signal processing – linguistics – language – Speech signal processing – For storage or transmission
Patent
1997-07-01
1999-07-13
Hudspeth, David R.
Data processing: speech signal processing, linguistics, language
Speech signal processing
For storage or transmission
704217, 704220, 704229, 704222, G10L 908
Patent
active
059240628
ABSTRACT:
A codebook correlation matrix comprises a Toeplitz-type (diagonally symmetric) matrix which is calculated from a forty sample subframe of a speech signal, forming a 40.times.40 matrix. The resulting correlation coefficients which constitute the codes are stored within a DSP's local memory after calculation by dividing the matrix into five predefined x- and y- tracks, each track having a unique set of eight pulse positions. Using the eight pulse positions on each track, fifteen 8.times.8 sub-matrices are created which include all of the correlation coefficients in the original 40.times.40 matrix. The sub-matrices are distributed within a 5.times.5 mapping matrix which is correlated with a structure mapping matrix to determine the configuration of the resulting autocorrelation matrix for storage and searching. The sub-matrices within each column of correlated mapping matrices are searched by directing a multiplex pointer to that particular column.
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Chawan Vijay B.
Hudspeth David R.
Nokia Mobile Phones
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