Implementation of FIR Interpolation Filter on TMS320C6713 for VoIP Analysis

In voice over internet protocol (VoIP) system, the speech signal is degraded when passed through the network layers. The speech signal is processed through best effort policy based IP network, which include delay, packet loss and jitter network problems. The quality of VoIP speech signal can be improved by filtering the degraded VoIP speech signal through multirate filters. The work in this paper deals with the implementation of Interpolated finite impulse response (IFIR) filtering algorithm on degraded VoIP speech signal using TMS320C6713 DSP processor. The filter was designed using polyphase structure. The results of implementation experiment indicate the improvement of signal quality. The results are validated through the measurement of enhancement signal using perceptual evaluation of speech quality (PESQ) measurement, which shows the increase in MOS score at different packet loss rates (PLR).