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Analog input signal Low-pass filter Sampler Flat-topped PAM + – Quantizer (2 level) Variable gain ADM transmitter Integrator Step size f(d) Sequence detector Channel ADM signal ADM receiver Variable gain Integrator Analog output signal Sequence detector f(d) Step size Figure 3–34 ADM system. 205

Analog input<br />

signal<br />

Low-pass<br />

filter<br />

Sampler<br />

Flat-topped<br />

PAM +<br />

–<br />

<br />

Quantizer (2 level)<br />

Variable gain<br />

ADM transmitter<br />

Integrator<br />

Step size<br />

f(d)<br />

Sequence<br />

detector<br />

Channel<br />

ADM signal<br />

ADM receiver<br />

Variable gain<br />

Integrator<br />

Analog output<br />

signal<br />

Sequence<br />

detector<br />

f(d)<br />

Step size<br />

Figure 3–34<br />

ADM system.<br />

205

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