| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a noise insertion system with less malfunctions. SOLUTION: The number of the cells of a sound section judged as successive sound cells by a sound/silence cell judgement device 5 is counted. In the case that the counted number is equal to or more than a threshold, it is considered as the sound section to which a long hangover is added. Only in the case of judging that it is the long hangover, a final section rms value is held. A noise level is adjusted so as to make a background noise level be equivalent to the held rms value. By selecting the output of a voice decoder 7 in the sound section and selecting the output side of a noise generator 11 in a silence section by a switching device 14, pseudo background noise is inserted in the silence section.</p> |
