| 摘要 |
PROBLEM TO BE SOLVED: To provide a siren device for an emergency vehicle capable of suppressing power consumption and heat generation while securing a legal siren volume. SOLUTION: The siren device for the emergency vehicle includes a modulation circuit unit 51 to which an analog signal of a siren sound is inputted and which converts the inputted analog signal into a digital signal; a constant voltage switching circuit 52 which amplifies the converted digital signal; a smoothing circuit 53 which smoothes the amplified digital signal; and an impedance conversion circuit 54 which performs impedance conversion on the smoothed siren sound signal and outputs the signal to a speaker. COPYRIGHT: (C)2008,JPO&INPIT
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