Title :
Analysis and optimization of speech coder algorithm for CDMA digital cellular
Author :
Park, Jh Hyun ; Kim, Young Min
Author_Institution :
Dept. of Electron. Eng., Chonnam Nat. Univ., Kwangju, South Korea
Abstract :
CELP coding is a powerful technique for the realization of high-quality speech coders operating at variable bit rates. The paper describes an implementation of a QCELP coder algorithm for CDMA. In addition, a hardware implementation for improving the speech coding rate of QCELP speech coders is explored. The coder can operate at different bit rates by simply comparing the energy in the frame with the threshold which is based upon an estimate of the background noise level. This research is based upon the design of DSP chips and ASICs for dedicated digital mobile communication applications
Keywords :
cellular radio; code division multiple access; digital radio; linear predictive coding; optimisation; speech coding; variable rate codes; vocoders; ASICs; CDMA digital cellular radio; CELP coding; DSP chips; QCELP coder algorithm; Qualcom CELP; background noise level; hardware implementation; high-quality speech coders; mobile communication applications; optimization; speech coder algorithm; speech coding rate; threshold; variable bit rates; Algorithm design and analysis; Background noise; Bit rate; Hardware; Multiaccess communication; Signal processing algorithms; Speech analysis; Speech codecs; Speech coding; Vocoders;
Conference_Titel :
Singapore ICCS '94. Conference Proceedings.
Print_ISBN :
0-7803-2046-8
DOI :
10.1109/ICCS.1994.474281
