| 摘要 |
PROBLEM TO BE SOLVED: To detect the rise of voice signals with a smaller amount of computations, to prevent the increase in the number of errors of the rise detec tion and to stably detect the rise. SOLUTION: A periodicity computing section 109 computes the degree of periodicity of input voice signals as parameter values. A comparison detection section 110 computes a power ratio from the average power within one frame and the long time average powder over a plurality of frames, compares the power ratio with a threshold value that is made variable depending on the degree of the periodicity of the input voice signals, detects the rise of the voice signals by the comparison result and outputs the detection result. |
