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Gary Scavone
2013-09-29 23:41:50 +02:00
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<h1>BlitSquare Class Reference</h1><!-- doxytag: class="BlitSquare" --><!-- doxytag: inherits="Generator" --><code>#include &lt;<a class="el" href="BlitSquare_8h-source.html">BlitSquare.h</a>&gt;</code>
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<a href="classBlitSquare-members.html">List of all members.</a><hr><a name="_details"></a><h2>Detailed Description</h2>
STK band-limited square wave class.
<p>
This class generates a band-limited square wave signal. It is derived in part from the approach reported by Stilson and Smith in "Alias-Free Digital Synthesis of Classic Analog Waveforms", 1996. The algorithm implemented in this class uses a SincM function with an even M value to achieve a bipolar bandlimited impulse train. This signal is then integrated to achieve a square waveform. The integration process has an associated DC offset but that is subtracted off the output signal.<p>
This class generates a band-limited square wave signal. It is derived in part from the approach reported by Stilson and Smith in "Alias-Free Digital Synthesis of Classic Analog Waveforms", 1996. The algorithm implemented in this class uses a SincM function with an even M value to achieve a bipolar bandlimited impulse train. This signal is then integrated to achieve a square waveform. The integration process has an associated DC offset so a DC blocking filter is applied at the output.<p>
The user can specify both the fundamental frequency of the waveform and the number of harmonics contained in the resulting signal.<p>
If nHarmonics is 0, then the signal will contain all harmonics up to half the sample rate. Note, however, that this setting may produce aliasing in the signal when the frequency is changing (no automatic modification of the number of harmonics is performed by the <a class="el" href="classBlitSquare.html#a5">setFrequency()</a> function).<p>
Based on initial code of Robin Davies, 2005. Modified algorithm code by Gary Scavone, 2005.
If nHarmonics is 0, then the signal will contain all harmonics up to half the sample rate. Note, however, that this setting may produce aliasing in the signal when the frequency is changing (no automatic modification of the number of harmonics is performed by the <a class="el" href="classBlitSquare.html#a5">setFrequency()</a> function). Also note that the harmonics of a square wave fall at odd integer multiples of the fundamental, so aliasing will happen with a lower fundamental than with the other <a class="el" href="classBlit.html">Blit</a> waveforms. This class is not guaranteed to be well behaved in the presence of significant aliasing.<p>
Based on initial code of Robin Davies, 2005. Modified algorithm code by Gary Scavone, 2005 - 2006.
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<tr><td><A HREF="http://ccrma.stanford.edu/software/stk/"><I>The Synthesis ToolKit in C++ (STK)</I></A></td></tr>
<tr><td>&copy;1995-2005 Perry R. Cook and Gary P. Scavone. All Rights Reserved.</td></tr>
<tr><td>&copy;1995-2007 Perry R. Cook and Gary P. Scavone. All Rights Reserved.</td></tr>
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