各种速率矢量和激励线性预测(VSELP)编码器的实现  

Implementation of VSELP Vocoder of Various Bit Rate

作　　者：丘晖[1] 刘波涛[1] 匡镜明[1] 

机构地区：[1]北京理工大学电子工程系

出　　处：《北京理工大学学报》1997年第6期780-784,共5页Transactions of Beijing Institute of Technology

基　　金：电科院电子科技预研基金

摘　　要：研究并改进了矢量和激励线性预测（ｖｅｃｔｏｒｓｕｍｅｘｃｉｔｅｄｌｉｎｅａｒｐｒｅｄｉｃｔｉｏｎ，ＶＳＥＬＰ）语音编码器．介绍了８ｋｂｉｔ／ｓＶＳＥＬＰ编码方案的实现及在此基础上利用矢量量化ＬＰＣ参数、减少激励码本数和子块分裂等方法；改进的６．４ｋｂｉｔ／ｓ，４．８ｋｂｉｔ／ｓ及２．４ｋｂｉｔ／ｓＶＳＥＬＰ的方案和结果．试听结果表明，６．４ｋｂｉｔ／ｓ，４．８ｋｂｉｔ／ｓ方案的合成语音质量接近８ｋｂｉｔ／ｓ的，具有较高的可懂度和自然度，而２．４ｋｂｉｔ／ｓ的质量明显下降．Vector sum excited linear predictive speech coding was studied and enhanced.Presented were the algorithm design and implementation of the VSELP coding at 8kbit/s,and those enhanced at 6.4kbit/s,4.8kbit/s and 2.4kbit/s via vector quantization of LPC parameter,reduction of excitation codebooks and sub block splitting etc.The informal listening showed,that the reconstructed quality of speech (QOS) at 4.8kbit/s and above were not obviously worse than that at 8kbit/s,and of good naturalness intelligibility,but the QOS at 2.4kbit/s was perceivably worse than that at 8kbit/s.

关 键 词：激励线性预测 矢量量化 语音编码器 语音合成 

分 类 号：TN912.32[电子电信—通信与信息系统]