一种基于改进Mel倒谱的语音质量评估方法  

An Objective Speech Quality Evaluation Method Based on Improved Mel Cepstrum Parameters

作　　者：宣章健 蔡晓霞 廖锡畅 丁睿 XUAN Zhang-jian;CAI Xiao-xia;LIAO Xi-chang;DING Rui(Institute of Electronic Warfare,National Defense Technology University,Hefei 230037,China;Nanjing University of Science and Technology College of Electronic Engineering and Optoelectronics,Nanjing 210094,China)

机构地区：[1]国防科技大学电子对抗学院,合肥230037 [2]南京理工大学电子工程与光电技术学院,南京210094

出　　处：《电子信息对抗技术》2019年第1期51-55,共5页Electronic Information Warfare Technology

摘　　要：在语音质量客观评估方法中,通常以Mel倒谱系数作为语音特征参数。但是Mel倒谱阶数的变化对评估效果有着直接的影响,同时Mel倒谱系数中各个分量对语音质量评估的贡献度不同,而以往的研究没有涉及Mel倒谱阶数和分量贡献度对语音质量评估效果的影响。实验确定了最佳阶数后,结合增减分量法对Mel倒谱系数进行贡献度的研究,通过对特征参数的选择重组,得到维数更低的IMFCC(Important Mel Frequency Cepstrum coefficient)。经检验,改进后的方法提高了2%的评估效果,降低了2%的预测误差。In the objective evaluation method of speech quality,the Mel cepstrum coefficient is usually used as the speech characteristic parameter.However,the change of Mel's cepstrum order has direct influenceonthe evaluation effect,and the contribution of Mel cepstrum coefficients to speech quality evaluation is different.But the previous research does not relate to the effect of the above two factors on speech quality evaluation.The study of Mel cepstrum order on evaluation effect is made and the optimal order is determined.Then the contribution of Mel cepstrum coefficient is studied by combining the increment and decrease component method to get lower dimension IMFCC(Important Mel Frequency Cepstrum Coefficient).Test shows that the improved method promotes the evaluation effect by 2%and reduces the prediction error by 2%.

关 键 词：语音质量评估 MEL倒谱系数 增减分量法 贡献度 失真距离 

分 类 号：TN912.3[电子电信—通信与信息系统]