A Simulation-Based Comparison on Code Excited Linear Prediction (CELP) Coder at Different Bit Rates

A better speech quality is necessary for transmission of speech in mobile communication systems in Digital Telephony. Nowadays, the conversion of analog speech signals into digital format is required for effective transmission of speech over different channels at far ends. The technique for conversion of speech in digital form is very old and ordinary one which is termed as pulse code modulation (PCM), but the bandwidth of the digitally converted data is too large, so a better level of compression is needed to reduce the bandwidth and enhance the capacity of channel. The compression of speech in nowadays is performed by a procedure called speech coding. In this paper, the code excited linear predictive (CELP) coding is summarized with different bit rates. The MATLAB R2016a version is used for simulating the 9.6 and 16 kbps CELP coder, and performance analysis is done with parameters MSE and SNR.