Explain DPCM with block diagram.

Explain DPCM with block diagram.
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The above figure shows the block diagram of DPCM transmitter x(t) is the analog input signal and x^(t) is its approximated signal. What is important to know is whether x^(t) is larger or smaller than x(t) and by how much. At each sampling instant the difference amplifier compares x(t) and x^(t) and the sample and hold circuit will hold the result of this subtraction. The difference signals at the output of sample and hold circuit is quantized by the quantizer. The quantizer output S0(t) is the transmitted as it is or it is encoded into a stream of bits as explained in conventional PCM system. The quantizer output is also used to produce the approximated signal x^(t)by passing the quantizer output through a predictor and accumulator.

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