Differential PCM (DPCM) technique is the process of preventing the redundant information that is formed when the highly correlated samples are encoded by PCM technique. A sampled value which is calculated from its previous output is used to summarize them with the quantized values.
It contains Quantizer and Predictor as well with two summer circuits. Below is the pictorial representation of DPCM transmitter.
The signals at each point are named as −
The predictor outputs the assumed samples from its previous outputs. The quantized versions of the input signal x(nTs)x(nTs) is given as input to this predictor.
Quantizer Output is represented as −
Where q (nTs) is the quantization error
Predictor input is the sum of quantizer output and predictor output,
To regenerate the original input, the same predictor circuit is used to decode.
DPCM receiver contains a decoder, a predictor, and summit circuit. Below is the DPCM receiver.
The encoded receiver input is same as the encoded transmitter output in the absence of noise.
The input to the decoder is processed and that output is summed up with the output of the predictor for output.
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