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<title>Adaptive predictive coding</title>
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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">Adaptive predictive coding</span></span>
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<div id="mw-content-text" class="mw-body-content mw-content-ltr" lang="en" dir="ltr"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><p><b>Adaptive predictive coding</b> (<b>APC</b>) is a <a href="Narrowband" title="Narrowband">narrowband</a> <a href="Analog-to-digital_converter" title="Analog-to-digital converter">analog-to-digital conversion</a> that uses a one-level or multilevel <a href="Sampling_(signal_processing)" title="Sampling (signal processing)">sampling system</a> in which the value of the <a href="Signal_(information_theory)" class="mw-redirect" title="Signal (information theory)">signal</a> at each sampling instant is predicted according to a linear function of the past values of the <a href="Quantization_(signal_processing)" title="Quantization (signal processing)">quantized</a> signals.<sup id="cite_ref-Keiser2012_1-0" class="reference"><a href="#cite_note-Keiser2012-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>
</p><p>APC is related to <a href="Linear_predictive_coding" title="Linear predictive coding">linear predictive coding</a> (LPC) in that both use adaptive predictors. However, APC uses fewer prediction coefficients, thus requiring a higher <a href="Sampling_rate" class="mw-redirect" title="Sampling rate">sampling rate</a> than LPC.
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</style><cite id="CITEREFKeiserStrange2012" class="citation book cs1">Keiser, Bernard E.; Strange, Eugene (2012). <a rel="nofollow" class="external text" href="https://books.google.com/books?id=4E3TBwAAQBAJ&dq=adaptive+predictive+coding+ADC&pg=PA94"><i>Digital Telephony and Network Integration</i></a>. Springer Science & Business Media. p. 94. <a href="ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <bdi>9781461517870</bdi><span class="reference-accessdate">. Retrieved <span class="nowrap">5 April</span> 2018</span>.</cite></span>
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</style><span class="citation 1037C"><span class="noviewer" typeof="mw:File"><span></span></span> This article incorporates <a href="Copyright_status_of_works_by_the_federal_government_of_the_United_States" title="Copyright status of works by the federal government of the United States">public domain material</a> from <cite class="citation cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20220122224547/https://www.its.bldrdoc.gov/fs-1037/fs-1037c.htm"><i>Federal Standard 1037C</i></a>. <a href="General_Services_Administration" title="General Services Administration">General Services Administration</a>. Archived from <a rel="nofollow" class="external text" href="https://www.its.bldrdoc.gov/fs-1037/fs-1037c.htm">the original</a> on 2022-01-22.</cite></span>
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