| 摘要 |
PURPOSE: An acoustic signal device in a crosswalk is provided to improve a listening sensitivity of a buzzer sound by outputting a pre-recoded sound and allow to use the existing line by simply adding an extra circuit in the conventional traffic signal system. CONSTITUTION: In an acoustic signal device in a crosswalk, an acoustic output ramp(13) amplifies the pre-recorded sound and outputs the amplified sound. The first relay(15) is provided, wherein when a high-pressure power is applied by an electric switch(11), a high pressure power is transferred and when the high-pressure power is not applied, an amplified sound output from the acoustic output ramp is transferred. The second relay(16) is provided, wherein when the first relay outputs a high-pressure power, the high-pressure power is transferred to a red ramp(5) and when the first relay outputs a sound, an acoustic output is transferred to a speaker(10).
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