FIXED-POINT IMPLEMENTATION OF THE QCELP SPEECH CODER

The Qualcomm code excited linear prediction (QCELP) speech coder was a dopted to increase the capacity of the CDMA Mobile System (CMS). In th is paper, we implemented the QCELP speech coding algorithm by using TM S320C50 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 ?Ok words and data memory was 4k w ords, 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.