| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve the precision of acoustic signal analysis. SOLUTION: A frequency conversion function (frequency warping function) designed according to the frequency characteristics of a target acoustic signal is inputted from a frequency conversion frequency inputting part 1. A base function having the frequency conversion function in a phase item is calculated by a base function setting part 2, and an impulse response approximating the base function is calculated by an impulse response calculating part 3. The superimposition processing of the impulse response and the acoustic signal inputted from the inputting part 4 is executed by a correlation calculating part 5, and the correlation of the processed result and the inputted acoustic signal is calculated. Then, a normal equation is calculated from the correlation by an analyzing part 6, and this normal equation is solved by using a well known algorithm such as a Durbin-Levinson-Itakura method so that an LPC coefficient or the like can be calculated.</p> |
