Process for generating at least one among a set of vectors of the book of code and to quantizador vector.The generator to provide set of vectors of the book of code 2m for quantizador vector, digital memory.The process of selecting a word code of stimulation for the encoder signal excited by code book search controller code for encoder signal excited by code.The process of selecting word code of stimulation specifies I from a set of code words of excitement y,The voice encoder and process of reconstructing signal memory of the Book Co.

摘要

An improved excitation vector generation and search technique (FIG. 1) is described for a code-excited linear prediction (CELP) speech coder (100) using a codebook of excitation code vectors. A set of M basis vectors Vm(n) are used along with the excitation signal codewords (i) to generate the codebook of excitation vectors ui(n) according to a "vector sum" technique (120) of converting the selector codewords into a plurality of interim data signals, multiplying the set of M basis vectors by the interim data signals, and summing the resultant vectors to produce the set of 2M codebook vectors. The entire codebook of 2M possible excitation vectors is efficiently searched by using the vector sum generation technique with the M basis vectors-without ever having to generate and evaluate each of the 2M code vectors themselves. Furthermore, only M basis vectors need to be stored in memory (114), as opposed to all 2M code vectors.