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Add FFTW3
author Chris Cannam
date Wed, 20 Mar 2013 15:35:50 +0000
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58 <h4 class="subsection">4.8.5 1d Discrete Hartley Transforms (DHTs)</h4>
59
60 <p><a name="index-discrete-Hartley-transform-322"></a><a name="index-DHT-323"></a>The discrete Hartley transform (DHT) of a 1d real array X of size
61 n computes a real array Y of the same size, where:
62 <center><img src="equation-dht.png" align="top">.</center>
63
64 <p><a name="index-normalization-324"></a>FFTW computes an unnormalized transform, in that there is no coefficient
65 in front of the summation in the DHT. In other words, applying the
66 transform twice (the DHT is its own inverse) will multiply the input by
67 n.
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