| 摘要 |
A voice processor performing logarithm compression and decompression enabling various signal processing functions to be efficiently added. When there is a mu Law compression input, an approximate logarithm conversion process is performed. The processor performs bit inversion on the mu Law compression value and sets MSB to "0" to obtain an approximate mu log value. The approximate mu log value is then subjected to various basic calculations. With respect to the approximate mu 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 mu Law compression output.
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