Title :
Vector sum codebook structure for variable rate coding
Author :
Wen-Whei Chang ; Liour, Jehng-Yih
Author_Institution :
Dept. of Commun. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan
Abstract :
Recent applications in integrated network and secure communication necessitate the development of flexible speech coding techniques under adverse channel conditions. The authors explore the vector-sum innovation codebook structure in conjunction with a dynamic bit allocation strategy to develop an efficient variable rate speech coding system. The design algorithms for optimizing the basic innovation codevectors are described. They propose a dynamic bit allocation using the threshold decision rule to emphasize the locally important phonetic features. Furthermore, the linear prediction parameters are efficiently quantized by exploiting the inherent ordering relationship among the line spectrum pair parameters
Keywords :
speech coding; vectors; design algorithms; dynamic bit allocation; innovation codevectors; integrated network; line spectrum pair parameters; linear prediction parameters; phonetic features; secure communication; speech coding; threshold decision rule; variable rate coding; vector sum codebook; Bit rate; Filters; ISDN; Pulse modulation; Signal synthesis; Speech analysis; Speech coding; Speech synthesis; Switches; Technological innovation;
Conference_Titel :
Singapore ICCS/ISITA '92. 'Communications on the Move'
Print_ISBN :
0-7803-0803-4
DOI :
10.1109/ICCS.1992.254915