Tong Ming1,Bian Zhengzhong1,Dai Qijun1,Chen Yanpu2,Zhang Liang1
(1.School of Life Science and Technology,Xi'an Jiaotong University,Xi'an 710049, China;
2.Foundation Department,Xi'an Communication College,Xi'an 710106,China)
Abstract:The perceptual effect of the phase information in speech has been studied by auditory subjective tests. It has been shown that when the phase spectrum in speech is changed and it¡¯s amplitude spectrum is kept constant, there is no different auditory perception between the original speech and the reconstructed speech if the envelope of the reconstructed speech signal is not changed. The auditory perception effect of the reconstructed speech is mainly dependent on the amplitude of the derivative of the additive phase with respect to frequency. The perceptual quality in speech is determined by the maximum relative time shift between different frequency components. When the maximum relative time shift is less than 10 ms, the perceptual quality is excellent. The speech understanding will not be depressed provided that the maximum relative time shift between different frequency components due to phase distortion is less than 20 ms.
Keywords:speech signal;auditory perception;phase spectrum;additive phase