| 摘要 |
Even in a state that the change of an environmental noise cannot be anticipated, a sound generating period in an audio signal can be specified with high accuracy. Sound in an audio space in which an audio signal processing system 1 is disposed is always collected by a microphone 20 and inputted to an audio signal processing device 10 as an audio signal. Before a user carried out a prescribed operation, the audio signals inputted from the microphone 20 are sequentially stored in a first buffer 121. After the prescribed operation is carried out, the audio signals are sequentially stored in a second buffer 122. A specifying part 114 considers the level of the audio signal stored in the first buffer 121 as the level of the environmental noise and the level of the audio signal sequentially stored in the second buffer 122 as the level of sound generated at a current time to calculate an S/N ratio. The specifying part 114 sequentially decides whether or not the calculated S/N ratio satisfies a prescribed condition to specify the sound generating period in the audio signal. |
