Differential pulse code modulation (DPCM) system plays an important role in communication systems. In this paper a considerable amount of theoretical analysis has been carried out on DPCM structure, degree of predictor and quantizer unit. Simulation has been done using
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Differential pulse code modulation (DPCM) system plays an important role in communication systems. In this paper a considerable amount of theoretical analysis has been carried out on DPCM structure, degree of predictor and quantizer unit. Simulation has been done using DPCM scheme. Here, instead of direct coding of signal, difference between two signals, input to DPCM and estimated output, is encoded. Consequently, application of the difference signal to quantizer unit, fewer bits for each sample is achieved at the output of the quantizer unit. In this study, Levinson-Durbin algorithm is utilized to design the optimal predictor. For the optimal quantized levels, classical together with Lloyd method are employed. Finally, second order predictor together with optimal quantized levels, 2-bit for normal case and 3-bit for optimal case, is successfully achieved to process ECG signal at DPCM scheme.
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