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Reference.org
Wavelet packet decomposition
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<p>Originally known as optimal subband tree structuring (SB-TS), also called wavelet packet decomposition (WPD; sometimes known as just wavelet packets or subband tree), is a <a href="/facts/Wavelet/3XcX4uIP">wavelet</a> transform where the discrete-time (sampled) signal is passed through more filters than the <a href="/facts/Discrete_wavelet_transform/19DVnk4n">discrete wavelet transform</a> (DWT). </p>