Parametric Analysis of FIR Digital Filter for Wireless VoIP System

Sansar Chand, Harjit Pal Singh,Jasbinder Singh, Anurag Sharma


In Voice over Internet Protocol (VoIP) system, the speech signal is degraded when passed through the network layers. The speech signal is processed through the best effort policy based IP network, which leads to the network degradations including delay, packet loss jitter. The implementation of the signal through digital signal processor can improve the quality of the degraded VoIP signal. The work in this paper presents the parametric analysis of the Finite Impulse Response (FIR) filter for speech quality improvement in wireless VoIP system.. The VoIP simulations are conducted with G.711 and G.729A speech coders at different packet loss rates. The performance of the enhanced VoIP signal is evaluated using Perceptual Evaluation of Speech Quality (PESQ) measurement for narrowband signal. The results show significant improvement in the quality of the VoIP signal.

Keywords: VoIP, Signal processing, FIR digital filter, Packet Loss

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