| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that, in order to obscure audio comprehension nature, a cut-off frequency is lowered to a degree in which a formant structure of voice is not transmitted so that sound of high frequency band may not be transmitted, but in such a case, information of a sound source other than voice (glass cracking sound etc.), which is high in frequency, is not transmitted.SOLUTION: In sound signal transmitting technology, a sound signal collected by a microphone is divided into frames by prescribed time, and a sound signal by frame is divided into a plurality of frequency band sound signals, and the divided sound signal by frame is obscured. When the obscuring processing is performed, frequency smoothed power of the input signal is determined, and variation of the input signal is compressed, and the input signal is time smoothed to longer time than a frame length. |
