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Warped linear predictive coding
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<p>Warped linear predictive coding (warped LPC or WLPC) is a variant of <a href="/facts/Linear_predictive_coding/2Bl1xdSN">linear predictive coding</a> in which the spectral representation of the system is modified, for example by replacing the unit delays used in an LPC implementation with first-order <a href="/facts/All-pass_filter/MbLLEH7I">all-pass filters</a>. This can have advantages in reducing the bitrate required for a given level of perceived audio quality/intelligibility, especially in <a href="/facts/Wideband/wv1yPnkF">wideband</a> audio coding. </p>