| 摘要 |
PURPOSE:To find an optimum LPC coefficient in consideration of the quantization error of a sound signal by a voice parameter analyzing device incorporated in a voice-coder used for a digital communication, etc. CONSTITUTION:The autocorrelation coefficient of an input voice in a certain section is found by a 1st windowing means 11 and an autocorrelation calculating means 12. A subtracting means 13 finds the difference between the input voice and a previously obtained sound source signal, and a cross correlation calculating means 15 finds the cross correlation coefficient between the error signal and input voice from the windowing difference signal obtained by windowing the difference signal by a 2nd windowing means 14 and the windowed input voice from the 1st windowing means 11. And, an LPC coefficient calculating means 16 inputs the obtained autocorrelation coefficient and cross correlation coefficient to find the LPC coefficient. |
