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Adaptive predictive coding
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<p>Adaptive predictive coding (APC) is a <a href="/facts/Narrowband/76nBsRml">narrowband</a> <a href="/facts/Analog-to-digital_converter/8YYNsMFg">analog-to-digital conversion</a> that uses a one-level or multilevel <a href="/facts/Sampling_(signal_processing)/xxck7aLN">sampling system</a> in which the value of the <a href="/facts/Signal_(information_theory)/41YqUJ8c">signal</a> at each sampling instant is predicted according to a linear function of the past values of the <a href="/facts/Quantization_(signal_processing)/fddS3BE2">quantized</a> signals. </p><p>APC is related to <a href="/facts/Linear_predictive_coding/2Bl1xdSN">linear predictive coding</a> (LPC) in that both use adaptive predictors. However, APC uses fewer prediction coefficients, thus requiring a higher <a href="/facts/Sampling_rate/xxck7aLN">sampling rate</a> than LPC. </p> <p> This article incorporates <a href="/facts/Copyright_status_of_works_by_the_federal_government_of_the_United_States/Q1jvr96g">public domain material</a> from <a 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="/facts/General_Services_Administration/Np3opv9x">General Services Administration</a>. Archived from <a href="https://www.its.bldrdoc.gov/fs-1037/fs-1037c.htm">the original</a> on 2022-01-22. </p>