| 摘要 |
<P>PROBLEM TO BE SOLVED: To allow a pedestrian, etc. to easily recognize approach of a vehicle body even if sound pressure is not increased. <P>SOLUTION: This artificial sound output device includes an input acceptance means 2 for accepting an input of a sound wave, an amplitude envelope calculation means 3 for calculating amplitude envelope of the accepted sound wave, a basic period calculation means 4 for performing frequency analysis of the amplitude envelope and determining a basic period from a reciprocal of the frequency having the largest spectrum, and an utterance time extraction means 5 for calculating time having the largest amplitude, as utterance time using the basic period. An amplitude deviation amount is extracted from a sound pressure level at the utterance time, and emphasis processing is performed in a state in which deviation tendency in time series is held as to the extracted amplitude deviation amount. Then, an output is performed as to sound performed with the emphasis processing thereon. <P>COPYRIGHT: (C)2013,JPO&INPIT |
