| 摘要 |
<P>PROBLEM TO BE SOLVED: To control change of acoustic pressure in sound production of a sound production body such as a speaker with temperature change, and control decrease of reporting property. <P>SOLUTION: A voltage level of an approach report sound voltage waveform signal is corrected according to a speaker temperature, and a sound pressure level of a vehicle approach report sound actually output from a speaker 3 is made to become constant. As a result, the change of the acoustic pressure of the sound production of the speaker 3 can be controlled according to the temperature change, and the decrease of the report can be controlled. Therefore, both the report and the noise can be filled even if there is a temperature change of the speaker 3. <P>COPYRIGHT: (C)2013,JPO&INPIT |
