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<div align="justify"><b>Problem statement:</b> In low-bit-rate speech communication, speech coding deteriorates the&#13; characteristics of the coded speech significantly. An important feature of the speech is the fundamental&#13; frequency contour which determines the pitch information of the speech. It has been known that pitch&#13; information is one of the core parameter of the multi-pulse based code excited linear prediction (MPCELP)&#13; speech coder. Therefore the study of the deteriorated fundamental frequency contour should be&#13; conducted properly. <b>Approach: </b>This study proposes an analysis of the fundamental frequency contour&#13; of the coded speech based on MP-CELP speech coder. The comparison of the fundamental frequency&#13; contour of the natural speech and that of the coded speech has been performed. The MP-CELP with&#13; three levels of bitrate scalability is selected as the core speech coder. The speech material includes a&#13; hundred of male speech utterances and a hundred of female speech utterances. <b>Results:</b> The&#13; experimental results show that the speech coder causes the deterioration of the fundamental frequency&#13; contour empirically. The Root Mean Square Error (RMSE) between the fundamental frequency&#13; contour of the natural speech and that of the coded speech for three different bitrates has been&#13; conducted. The lower bitrate causes the higher value of RMSE. <b>Conclusion:</b> From the study, it is a&#13; proved that the MP-CELP speech coder deteriorates the fundamental frequency contour of the&#13; transmitted speech.</div

Analysis of Fundamental Frequency Contour of Coded Speech Based on Multi-Pulse Based Code Excited Linear Prediction Algorithm