Differential pulse-code modulation

<h2 id="option-1-difference-between-two-consecutive-quantized-samples">Option 1: difference between two consecutive quantized samples</h2>
<p>The encoder performs the function of differentiation; a quantizer precedes the differencing of adjacent quantized samples; the decoder is an accumulator, which if correctly initialized exactly recovers the quantized signal.
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<h2 id="option-2-analysis-by-synthesis">Option 2: analysis by synthesis</h2>
<p>The incorporation of the decoder inside the encoder allows quantization of the differences, including nonlinear quantization, in the encoder, as long as an approximate inverse quantizer is used appropriately in the receiver. When the quantizer is uniform, the decoder regenerates the differences implicitly, as in this simple diagram that Cutler showed:
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<h2 id="see-also">See also</h2>
<ul><li><a href="/facts/Adaptive_differential_pulse-code_modulation/Q6cFrNUb">Adaptive differential pulse-code modulation</a></li>
<li><a href="/facts/Delta_modulation/FHugWnV9">Delta modulation</a>, a special case of DPCM where the differences eQ[n] are represented with 1 bit as ±Δ</li>
<li><a href="/facts/Pulse_modulation_methods/aAXPjINv">Pulse modulation methods</a></li>
<li><a href="/facts/Delta-sigma_modulation/QrhBCoUe">Delta-sigma modulation</a></li></ul>

<h2 id="references">References</h2>

<ol>
<li id="fn:1"><p>U.S. patent 2605361, C. Chapin Cutler, "Differential Quantization of Communication Signals", filed June 29, 1950, issued July 29, 1952 <a href="https://patents.google.com/patent/US2605361" target="_blank">https://patents.google.com/patent/US2605361</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li>
</ol>

Differential pulse-code modulation open-in-new

Differential pulse-code modulation