Implementation of Voice Excited Linear Predictive Coding (VELP) on TMS320C6711 DSP Kit

Abstract

In today's world, telecommunication is the field in which the maximum research work is being done and speech compression is the most vital part of communication. For high compression rate speech coders, voice excited linear predictive coding (VELP) is most widely used. This paper presents real time analysis of VELP by implementing it on TMS320C6711 DSP kit using Simulink RTW (real time workshop) which explains simulink model of VELP, VELP analysis, VELP synthesis, VELP implementation on DSP kit. VELP can be briefly explained as the signal is passed through analyzer, which generate the filter co-efficients and residual signal. The residual error signal has less redundancy than original speech signal and can be quantized by smaller number of bits than the original speech. The residual error signal along with the filter coefficients are transmitted to the receiver. At the receiver, the speech is reconstructed by passing the residual error signal through the synthesis filter. To model a human speech production system, all-pole model (also known as the linear prediction model) is used. For the real time analysis of VELP, it is implemented on DSP kit using MATLAB Simulink model