| 摘要 |
PROBLEM TO BE SOLVED: To provide an alarm sound generation device whose sound is easy to hear even to elderly people and in which high sound pressure is secured. SOLUTION: An alarm sound including low frequency with 2 kHz or less which is easy to hear even to the elderly people and high frequency higher than 2 kHz with which the sound pressure is secured is generated. In addition, as the high frequency, it is set to near the frequency with which the sound pressure higher than the maximum sound pressure V<SB>LMAX</SB>in a low frequency band A<SB>L</SB>with 2 kHz or less is obtained and the maximum sound pressure 85db/m is obtained in the high frequency band A<SB>H</SB>higher than 2 kHz. COPYRIGHT: (C)2006,JPO&NCIPI
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