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 in:ETRI journal 1997-10, Vol.19 (3), p.242-258
Main Authors: Yoon, Byung Sik, Kim, Jae Won, Lee, Won Myoung, Jang, Seok Jin, Choi, Song In, Lim, Myoung Seob
Format: Article
Language:English
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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 about 33 MIPS and program size 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 3.11.
ISSN:1225-6463
2233-7326
DOI:10.4218/etrij.97.0197.0309