多频声与窄带白噪声感知分辨的研究

本文选取3、5、7、9、11、13、15、17、19、21等10个临界带的频率范围，针对5、10、20、30、50、100个频率成分等6种频率组合的多频声信号，进行了同一临界带的多频声和窄带白噪声的听觉感知分辨的研究。结果表明，随着频率成分个数的增加，多频声与窄带白噪声越来越难于区分。而当频率成分个数确定时，高频段临界带的多频声与窄带白噪声更难于区分。上述结果在某种程度上反映了人耳的频率分辨能力，即人耳的频率分辨率与临界带有关，临界带序号越大，频率分辨率越差，多频声就越接近窄带白噪声。对第9临界带，频率分辨率约为4Hz。

The Study of Perceptual Difference Between Multitone and Narrow Band White-Noise

In the paper, the perceptual difference between multitone which has 10、20、30、50、100 components and narrow-band white noise in the same critical band is studied for critical bands 3,5,7,9,11,13,15,17,19 and 21. The results showed that with the increase in the number of frequency components，the perceptual sense of multitone gradually approach that of narrow-band white noise. To multitone with same number of frequency components，the higher frequency is, the more close to narrow-band white noise sensed. The results also reflected the human ear's ability to distinguish frequency. It means that the frequency resolution of ear is related to critical bands. The higher the critical band index, the worse the the frequency resolution of ear, and the more close to narrow-band white noise the multitone. To 9th critical band, the frequency resolution is about 4Hz.