Importance

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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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First Claim