CAJ | 학술논문

提出一种基于分频过零点探测的双耳声源定位的方法.为了估计ITD,通常方法是利用左右耳瞬间神经发放率的互相关运算求得.可是,这些方法由于涉及互相关运算需要高运算复杂性.而且在噪声多源环境下容易遭受ITD估计的不准确性.在提出的方法中,估计ITD值是通过在采样ITD直方图上加权SNR获得,其SNR估计值是由ITD采样的偏差计算出.因此该方法能提供声源方向的准确估计和噪声鲁棒性.为了证明该方法的有效性,在各种噪声环境下进行了声源定位仿真实验,其结果证实了声源方向估计的准确性和噪声鲁棒性,并且与通常的互相关法相比能够提供显著少的计算复杂性.
제출일충기우분빈과영점탐측적쌍이성원정위적방법.위료고계ITD,통상방법시이용좌우이순간신경발방솔적호상관운산구득.가시,저사방법유우섭급호상관운산수요고운산복잡성.이차재조성다원배경하용역조수ITD고계적불준학성.재제출적방법중,고계ITD치시통과재채양ITD직방도상가권SNR획득,기SNR고계치시유ITD채양적편차계산출.인차해방법능제공성원방향적준학고계화조성로봉성.위료증명해방법적유효성,재각충조성배경하진행료성원정위방진실험,기결과증실료성원방향고계적준학성화조성로봉성,병차여통상적호상관법상비능구제공현저소적계산복잡성.
A method of binaural sound localization based on detection of multi-band zero-crossing points generated from binaural filter-band outputs is presented.To estimate ITD,conventional methods use cross-correlation of left and right instantaneous firing rates of neurons.However,these methods require high computational complexity involved in the computation of cross-correlation.Furthermore,they suffer from inaccuracies in estimating ITD in noisy multisource environments.In the suggested method,the ITD values are estimated by a histogram weighted by the estimated SNR computed from the variances of ITD samples.As a result,the method provides an accurate estimate of sound source direction and is more robust to noise.To verify the validity of the method,simulations for sound localization are performed under noise condition.The simulation results show that the method is able to provide an accurateestimate of sound source direction and is more robust to noise while offering significantly less com putational complexity compared to the conventional cross-correlation based methods.