DPCM


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DPCM

DPCM

(Differential PCM) A PCM technique that codes the difference between sample points to compress the digital data. Because audio waves propagate in predictable patterns, DPCM predicts the next sample and codes the difference between the prediction and the actual point. The differences are smaller numbers than the numerical value of each sample on the full scale and thereby reduce the resulting bitstream. See PCM, ADPCM and sampling.
References in periodicals archive ?
Estrakh, "A modified OWA operator and its use in lossless DPCM image compression", Int.
Denic, "Compression of the highly correlated measurement signals using DPCM technique", Elektronika ir Elektrotechnika, vol.
Spasic, "On the sensitivity of the recursive filter with arbitrary order predictor in DPCM system", Serbian Journal of Electrical Engineering, vol.
Peric, "A probability of stability estimation of DPCM system with the first order predictor", Facta Universitatis, Series: Automatic Control and Robotics, vol.
Jocic, "Stability study of the second order recursive filter in DPCM system", Elektronika ir Elektrotechnika.
Neuvo, "Interframe DPCM with robust median-based predictors for transmission of image sequences over noise channel", IEEE Trans.
In DPCM system, value of a; is defined in advance, according to the class of signals which are considered and it is known both in the encoder and in the decoder.
The quality of the reconstructed signal for the DPCM system is defined with two parameters [3], [11], [12]:
Results shown in this section are obtained by the simulation of DPCM and ADPCM systems.
For DPCM system, the dependences of parameters SQNR and PRD on the predictor coefficient [a.
We can see that the optimal performances of the DPCM system are obtained for [a.