重庆邮电大学学报（自然科学版）2017，Vol.29Issue(2)：143-148,6.DOI:10.3979/j.issn.1673-825X.2017.02.001
一种基于混合MELP/CELP的4kbit/s声码器
A 4 kbit/s vocoder based on hybrid MELP/CELP
摘要
Abstract
Taking advantages of mixed excitation linear prediction(MELP) algorithm and code excitation linear prediction(CELP) algorithm,a hybrid MELP/CELP algorithm model is proposed.At the encoder,strongly voiced frames are coded by MELP while weakly voiced frames and unvoiced frames are coded by CELP.In MELP vocoder,the phase alignment technology is adopted to deal with the synchronization issue of original speech and synthesized speech.Objective mean opinion score(MOS) test and subjective diagnostic rhythm test(DRT) on 4 kbit/s hybrid MELP vocoder results indicate that the proposed algorithm offers good performance on high frequency speech signal and the synthesized speech,which achieves high intelligibility and clarity.关键词
低码率声码器/混合激励线性预测/码激励线性预测/相位对齐Key words
low bit rate speech coding/mixed excitation linear prediction/code excitation linear prediction/phase alignment分类
信息技术与安全科学引用本文复制引用
李强,舒勤军,谢虹恩,明艳..一种基于混合MELP/CELP的4kbit/s声码器[J].重庆邮电大学学报（自然科学版）,2017,29(2):143-148,6.基金项目
国家高技术研究发展计划(863计划)(2012AA01A508) （863计划）
The National 863 High Tech Research and Development Projects(2012AA01A508) （2012AA01A508）
