| 摘要 |
PROBLEM TO BE SOLVED: To achieve accurate detection of aural signal rise by less computational complexity without conversion processing of Fourier transform, etc. SOLUTION: This device is provided with a framing means 101 which divides input aural signal into frames of a predetermined length, a down sampler 103 as a band-limiting means to take out elements of a predetermined frequency band from the input aural signal, average frame power calculation means 102, 104 to calculate a power of the input aural signal of which a frequency band is limited in the frame, a long time average power calculation means 106 to calculate an average power of the input voice of which the band is limited over plural frames, and a comparison means 107 to compare the frame average power with a long time average power. And, the rise of the input aural signal is detected by comparing a judged value outputted by the comparison means with a predetermined threshold value or an adaptively controlled threshold. |
