多频声频率成分与感知倒谱距离的初步研究

Study on Frequency Components of Multi-tone and Perceptual Cepstrum Distance

通过理论计算和主观实验,研究了多频声频率成分在不同频响曲线下与感知倒谱距离和主观评价之间的关系。针对所选定的9种频响曲线和7种节目信号,当频率范围为1～10kHz之间时,感知倒谱距离与主观评价的相关系数最高仅为0.93,最低为0.80,7种信号中只有3种的主客观相关系数高于0.90。而当频率范围为50～15000Hz时,感知倒谱距离与主观评价的相关系数最大达到了0.96,最低为0.85,7种信号中有5种的主客观相关系数都高于0.90。从而得出了在频率成分个数较少的情况下,频率范围比频率间隔需要更优先考虑的结论。

The relationship among frequency components of multi-tone, perceptual cepstrum distance and subjective evaluation is studied for different frequency response curves through theoretical calculations and subjective experiments. For the 9 kinds of frequency response curves and 7 kinds of programs signals, when frequency range is 1-10 kHz, the highest correlation coefficient between perception cepstrum distance and subjective evaluation is 0.93, and the lowest is 0.84. Only 3 coefficients are higher than 0.90. When the frequency range is 50-15 000 Hz, the highest correlation coefficient is 0.96, and the lowest is 0.85. 5 coefficients are higher than 0.90. A conclusion that if only a small number of frequency components is available, the frequency range rather than the frequency interval need to be given more priority is obtained.