Voice signal processor

Abstract

A voice processor performing logarithm compression and decompression enabling various signal processing functions to be efficiently added. When there is a μ Law compression input, an approximate logarithm conversion process is performed. The processor performs bit inversion on the μ Law compression value and sets MSB to “0” to obtain an approximate μ log value. The approximate μ log value is then subjected to various basic calculations. With respect to the approximate μ log value, multiplication of linear values is performed through addition, and division is performed through subtraction. Further, the squaring of a linear value is performed by shifting 1 bit toward the right, and square root calculation of a linear value is performed by shifting 1 bit to the left. Also, a twofold of the linear value is calculated by adding “16”. The processor outputs the result to obtaining a μ Law compression output.

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