元音和复合声识别中噪声分离机制的实验研究

该文用配对比较方法，从夫调谐波的数量对谐波筛的影响（实验一）、失调谐波的位置（实验二）以及谐波相位与其失调幅度之间的相互作用（实验三）等三个方面对失调谐波的分离机制进行探讨。研究结果表明：（1）多个谐波同时失调时其失调效应要比单个谐波强，即谐波失调存在累积效应；（2）谐波次数不同，其失调效应也存在差异，这种差异与谐波和共振峰之间的距离有关，谐波越靠近共振峰，其失调效应越明显，但对由等振幅的谐波系列构成的复合声而言，高次谐波的失调效应比低次谐波弱；（3）谐波相位对其失调效应产生间接影响，这种影响与谐波的起始振幅有关，当相位为π／2和3π／2时，失调效应更加明显。

MECHANISMS OF NOISE SEGREGATION FROM VOWELS AND COMPLEX

Three experiments were conducted to investigate the mechanisms of noise segregation from vowel and complex when one or more harmonics were mistuned.Experiment one dealt with the number of mistuned harmonics as a factor affecting the harmonic mistuned effect(HME). The position effect of HME was concerned in experiment two. The last experiment considered the relationship between HME and phase of the mistuned harmonic. The results indicated that(1) the HME was much greater when more than two harmonics were mistuned than when only one harmonic was mistuned;(2)harmonic position played an important role in HME, the higher the harmonic was, the less HME was found for the complex, and the closer to formant the harmonic stood, the more significant HME existed; and(3) phase did not significantly affect the HME, however, its indirect contribution was observed, which was related to the starting amplitude of a harmonic.