| 摘要 |
PROBLEM TO BE SOLVED: To obtain a voice coder in which coding distortion is made less noticeable even at a low bit rate. SOLUTION: By windowing first autocorrelation coefficients, that are computed in an autocorrelation computing section 101 from inputted voice signals, using a different shaped autocorrelation window in first and second windowing sections 102 and 103, corrected second and third autocorrelation coefficients are obtained. Using the second autocorrelation coefficients, spectrum parameters, that are to be coded in a coding section 106, are computed in a coding spectrum parameter computing section 104. Moreover, a hearing weighted spectrum parameter computing section 105 computes the spectrum parameters for hearing weighted characteristic setting using the third autocorrelation coefficients. Based on the parameters, a hearing weight setting section 107 sets the hearing weighted characteristic for the coding of residual components conducted by a coding section 108. |
