Fixed Point Implementation of the QCELP Speech Coder
Byung Sik Yoon, Jae Won Kim Kim, Won Myoung Lee Lee, Seok Jin Jang Jang, Song In Choi, Myoung Seob Lim · ETRI Journal · 1997
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.