基于CELP编码的语音帧擦除掩蔽算法  

Algorithm of Speech Frame Erasure Concealment Based on CELP

作　　者：王春柳 朱欢 WANG Chunliu;ZHU Huan(Nanjing Normal University Zhongbei College,Department of Information Science and Technology,Nanjing 210023,China;Electrical Section,Ministry of Technology,Jiangsu Tianhong Machinery Industrial Co.,Ltd.,Zhenjiang 212325,China)

机构地区：[1]南京师范大学中北学院信息科学与技术系,江苏南京210023 [2]江苏天宏机械工业有限公司技术部电气科,江苏镇江212325

出　　处：《现代信息科技》2019年第17期55-57,60,共4页Modern Information Technology

摘　　要：本文提出一种基于CELP解码端的直线拟合的基音推导方法用于基音估计,该方法在CELP解码端出现语音帧丢失时能够更好地恢复丢失帧中的自适应码书部分,同时,为了保证丢失帧后的正常激励信号与实际激励信号同步,文中采用对声门脉冲进行再同步来提高帧擦除掩蔽后的语音合成质量。将这两种方法在ITU-T G.729编码标准中进行尝试,结果表明,所建议方法能够比原始方案取得更好的恢复效果,对基于CELP模型的语音编码器帧擦除掩蔽都有很好的效果。A novel pitch extrapolation based on straight line fitting in the decoder of CELP was proposed in this paper.This method can better recover the adaptive codebook part of the lost frame when the voice frame loss occurs at the CELP decoder.In addition,in order to ensure the synchronization of normal excitation signals and actual excitation signals after missing frames,a glottal pulse resynchronization method is used which improves the quality of speech synthesis after frame erasure concealment.We applied the two technologies to the ITU-T G.729 codec,the results show that the proposed method can achieve better recovery effect than the original scheme,and have good performance for frame erasure concealment of other speech codec based on CELP.

关 键 词：基音估计 帧擦除 帧擦除掩蔽 CELP 

分 类 号：TN912.3[电子电信—通信与信息系统]