A new technique for regular pulse predictive coding of speech at low bit rates
Ibrahim Mansour, Samer J. Alabed, Ahmad. Atieh · The International Conference on Electrical Engineering/The International Conference on Electrical Engineering · 2008
Speech coding is a very important area that finds civilian and military applications. Itcan be considered as one of the important stages in speech processing. It is used tocompress speech; this is because the speech signal is very redundant. Speech coding hasmany applications; it is used in digital telephony, in multimedia and in security ofdigital communications. In this paper, we focused on developing algorithms andmethods for a waveform speech coder operating at low bit rate with good qualityreconstructed speech signal. Moreover, a new model for linear predictive coding ofspeech that can be used to produce high quality speech at low data rate is introduced. Inthis model, we divided the residual (excitation signal) to subframes and made energyand voice / unvoice classifications to choose the best pulses in the residual that give uslow bit rate and good quality for the reconstructed speech. Hence, this vocoder forms anexcitation sequence which consists of groups of uniformly spaced pulses. Duringanalysis the amplitude and LP coefficients of the pulses are determined. In addition, anew technique in the quantization of the amplitude of each pulse as well as linearprediction parameters is proposed.