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DPCM transmitter<br />

Analog input<br />

signal<br />

Low-pass<br />

filter<br />

Bandlimited<br />

analog signal<br />

Flat-topped<br />

Quantized<br />

Sampler<br />

+ DPAM<br />

DPAM<br />

Quantizer<br />

<br />

M levels<br />

Encoder<br />

–<br />

DPCM<br />

z n<br />

PAM, w n<br />

e n<br />

y n<br />

Predictor<br />

+<br />

<br />

+<br />

Channel<br />

DPCM receiver<br />

Regeneration<br />

circuit<br />

DPCM<br />

Decoder<br />

DPAM<br />

+<br />

<br />

+<br />

PAM<br />

Reconstruction<br />

filter<br />

(low pass)<br />

Analog<br />

output<br />

signal<br />

Predictor<br />

Figure 3–30<br />

DPCM, using prediction from quantized differential signal.<br />

197

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