The signal-to-noise ratio estimation method and sound source localization method based on zero-crossings

摘要

The present invention relates to a method for estimating a signal-to-noise ratio and detecting a sound source direction by using a variance of zero crossing time differences of voice signals received from two sensors.;A sound source direction detection method using a zero crossing point according to the present invention includes the steps of receiving a signal output from the same sound source using the two sensors and separating the received signal by channel; ZCPA coding to obtain a zero crossing point and a maximum value by ZCPA coding each channel signal separated in frequency for each channel; An ITD calculation step of calculating an ITD value by using the zero crossing point and the highest value for each channel obtained in the ZCPA coding step; A variance calculation step of dividing each channel signal into a plurality of windows including the same number of zero crossing points and obtaining a variance of ITD values for each channel and window; A signal-to-noise ratio calculation step of calculating a signal-to-noise ratio using the variance of the ITD value for each channel and window and the center frequency of the channel; A reliability enhancement step of extracting an ITD value whose signal-to-noise ratio is greater than a threshold; Obtaining a horizontal angle histogram of the ITD value using the signal-to-noise ratio as a weight, and determining a maximum value of the horizontal angle histogram as a spatial position of the sound source.;Source direction detection, zero crossing, ZCPA coding, time delay, signal to noise ratio estimation