EFFICIENT CODEBOOK SEARCH PROCEDURE FOR VECTOR-SUM EXCITED LINEAR PREDICTIVE CODING OF SPEECH

作     者：CHAN, CF CHUI, SP 

作者机构：Dept. of Electron. Eng. City Polytech. of Hong Kong Kowloon 

出 版 物：《ELECTRONICS LETTERS》 (电子学快报)

年 卷 期：1994年第30卷第22期

页      面：1830-1831页

核心收录：

学科分类：0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 

主　　题：LINEAR PREDICTIVE CODING SPEECH CODING 

摘      要：An efficient codebook search method for the EIA/TIA IS-54 vector-sum excited linear predictive (VSELP) speech coder is described. The method uses a two-stage search procedure. In the first stage, diagonal approximation of the correlation matrix of the filtered basis vectors is assumed and a simple sign detection procedure is used to identify a codeword which is close to the optimum codeword. In the second stage, a refinement search is carried out on those codewords which have a Hamming distance of one from the codeword obtained in the first stage. The new search procedure has a complexity only proportional to the bit rate which is much faster than the Gray code search employed in the IS-54 VSELP coder. Simulation results show that the SNR obtained using the proposed fast procedure is the same as that obtained in the standard VSELP coder.