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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 , , :
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.