| 摘要 |
PURPOSE:To attain the miniaturization of an arithmetic circuit and economization and to perform an arithmetic operation with high accuracy by performing the arithmetic operation for retrieval with high accuracy and with small arithmetic quantity by using a DSP in form of fixed point. CONSTITUTION:Normalization parts 53, 57 are arranged at the front stages of correlation calculation parts 51, 55 in the retrieval loop of a pitch cycle and the retrieval loop of a code book, respectively, and after each element of input speech vector is normalized by the minimum power of 2 exceeding the maximum value of the absolute value at the normalization parts 53, 57, and it is supplied to the correlation calculation parts 51, 55, and correlation with a voice synthesis vector is found, and a square error can be calculated by a square error calculation parts 41, 49 based on the correlation value and the value of sum of squares of the voice synthesis vectors calculated at sum of squares calculation parts 52, 56. |
