| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To improve audibility for a pedestrian not noisily in the day time and at night. <P>SOLUTION: In sound generation, whether it is day time or night is decided to determine whether sound generation data for day time or sound generation data for night is selected as sound source data for sound generation. In traveling in the day time, the sound source data for sound generation that a low frequency component which is weak in directivity and is hardly attenuated by surrounding irregularity is increased and a high frequency component which is strong in directivity and is readily attenuated by the surrounding irregularity is reduced is used. In traveling at night, the sound source data for sound generation that the high frequency component which is strong in directivity and is readily attenuated by the surrounding irregularity is increased and the low frequency component which is weak in directivity and is hardly attenuated by the surrounding irregularity is reduced is used. Thus, a sound informing of vehicle approach is audible within a more remote and wider range in the day time and the sound informing of vehicle approach is audible only within a closer and narrower range at night. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
