A new sound source location estimation algorithm noticing formant frequency for sound image localization

This paper proposes a new sound source location algorithm for one receiving point noticing a formant frequency. The automatic operation of the sound image localization is necessary for the position estimation of the sound source in a large-scale building space like an auditorium. We measure the sound source location using the phase difference of a formant frequency through three microphones and the height of the receiving point. Normally the formant frequency has some fluctuation. Therefore, we propose a new method to reduce the influence of the fluctuant formant frequency by selecting the maximum components of the Fast Fourier Transform (FFT) results of the bandpass filter outputs and the echo is avoided by the detection of the occurrence of the formant signal. From some experiments, the proposed system can detect the sound source location with the errors less than 0.6 m.