固话信道下语音特征参数影响研究  

Influence of fixed telephone channel on voice feature parameters

作　　者：郭逾 张二华[1] 刘驰[1] 杨子凡[1] 

机构地区：[1]南京理工大学计算机科学与工程学院,江苏南京210094

出　　处：《现代电子技术》2015年第11期73-78,82,共7页Modern Electronics Technique

摘　　要：通过对比麦克风与固话信道下语音信号的时域、频域参数,结合固话传输系统的特性,分析语音信号经过固话信道传输后,各参数的异同点以及固话信道对语音信号的影响。并采用F比的方法,分析麦克风信道和固话信道下语音信号MFCC特征参数的差异。实验结果表明,语音信号经过固话信道传输后,不仅造成信号的频率失真,还伴随有宽带噪声和共振型噪声。在MFCC特征参数方面,麦克风和固话信道的第二维MFCC参数差异最明显,低维参数相比高维参数差异较大,男性说话人特征参数相比女性说话人差异较大。By comparing time-domain and frequency-domain parameters of voice signal in microphone channel and fixed telephone channel,the influence of parameter similarities,differences and fixed telephone channel on voice signal are analyzed in combination with the characteristics of the fixed telephone transmission system after the voice signal is transmitted through the fixed telephone channel. The difference of voice signal MFCC characteristic parameters in microphone channel and fixed tele-phone channel is analyzed with the method of F-ratio. The experimental results show that the frequency distortion of voice sig-nal,accompanying with wide-band noise and resonance noise,occurs after the voice signal is transmitted in the fixed telephone channel. In the aspect of MFCC characteristic parameters,the most obvious difference is the second dimensional MFCC parame-ter in microphone channel and fixed telephone channel,the difference in lower dimension is greater than that in higher dimen-sion,and the difference of characteristic parameter in male speakers is greater than that of female speakers.

关 键 词：固话信道 噪声 语音参数 MEL频率倒谱系数 F比 

分 类 号：TN912.34[电子电信—通信与信息系统]