Fixed Point Implementation of the QCELP Speech Coder

The Qualcomm code excited linear prediction (QCELP) speech coder was adopted to increase the capacity of the CDMA Mobile System (CMS). In this paper, we implemented the QCELP speech coding algorithm by using TMS320C50 fixed point DSP chip. Also the fixed point simulation was done with C language. Th...

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Bibliographic Details
Published inETRI journal Vol. 19; no. 3; pp. 242 - 258
Main Authors Yoon, Byung-Sik, Kim, Jae-Won, Lee, Won-Myoung, Jang, Seok-Jin, Choi, Song_in, Lim, Myoung-Seon
Format Journal Article
LanguageKorean
Published 한국전자통신연구원 03.04.1997
ETRI
Subjects
CDMA
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Summary:The Qualcomm code excited linear prediction (QCELP) speech coder was adopted to increase the capacity of the CDMA Mobile System (CMS). In this paper, we implemented the QCELP speech coding algorithm by using TMS320C50 fixed point DSP chip. Also the fixed point simulation was done with C language. The computation complexity of QCELP on TMS320C50 was 10k words and data memory was 4k words. In the normal call test on the CMS, where mobile to mobile call test was done in the bypass mode without double vocoding, mean opinion score for the speech quality was he Qualcomm code excited linear prediction (QCELP) speech quality was 3.11.
Bibliography:KISTI1.1003/JNL.JAKO199710102447811
ISSN:1225-6463
2233-7326