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The purpose of this study is to make software of equipment that detects siren sound of ambulance and to program it on a microcontroller in the equipment. By using two times FFT (Fast Fourier Transform) on detecting, the characteristics of the siren sound could be converted into numerical values. Siren sound was detected properly even under the Doppler effect. The proposed method could detect the siren sound in which S/N ratio is approximately 0 dB.

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