2.4kb/s Low Bit Rate Speech Coding Based on Local Cosine Transform

作     者：Dong Enqing (enqdong@***) Liu Guizhong (Liugz@***) Li Hongliang(hlli@***)(Department of Communication & Electronic Engineering Soochow University Su Zhou 215021 China) (School of Electronic and Information Engineering Xi’an Jiaotong University Xi’an 710049 China) 

会议名称：《2002年第6届信号处理国际会议》

会议日期：2002年

学科分类：11[军事学] 0810[工学-信息与通信工程] 1105[军事学-军队指挥学] 08[工学] 081002[工学-信号与信息处理] 110503[军事学-军事通信学] 

摘      要：正 A 2.4kb/s low-bit rate speech coder based on local cosine transform （LCT） algorithm is designed for the first time in the paper. Four segment vector quantizers of the local cosine transform coefficients are employed, and LGB algorithm is applied to design the codebooks. A tree fast search technique is used to select the vector of the local cosine transform coefficients for each splitted vector. The evaluation using subject informal listening tests and a few object parameters indicates that the reconstructed speech quality of the designed low bit rate speech coder is better than that of the FS1015 coder in intelligibility and naturalness. The new coder has higher robust than the FS1015 coder, which is suitable for speech coding in any environments.