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52 lines
2.4 KiB
52 lines
2.4 KiB
8 years ago
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<script type="text/x-red" data-help-name="AudioEffectChorus">
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<h3>Summary</h3>
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<div class=tooltipinfo>
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<p>The chorus effect simulates the richness of several nearly-identical
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sound sources (like the way a choir sounds different to a single singer).
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It does this by sampling from a delay line, so each voice is actually
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the same but at a slightly different point in time. This is a type of
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comb filtering.</p>
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</div>
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<p>Chorus combines one or more samples ranging from the most recent
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sample back to about 50ms ago. The additional samples are evenly spread
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through the supplied delay line, and there is no modulation.</p>
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<p>If the number of voices is specified as 2, then the
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effect combines the current sample and the oldest sample (the last one
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in the delay line). If the number of voices is 3 then the effect combines
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the most recent sample, the oldest sample and the sample in the middle of
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the delay line.</p>
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<p>For two voices the effect can be represented as:<br/>
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result = (sample(0) + sample(dt))/2<br/>
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where sample(0) represents the current sample and sample(dt)
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is the sample in the delay line from dt milliseconds ago.</p>
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<h3>Audio Connections</h3>
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<table class=doc align=center cellpadding=3>
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<tr class="top"><th>Port</th><th>Purpose</th></tr>
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<tr class="odd"><td align="center">In 0</td><td>Signal Input</td></tr>
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<tr class="odd"><td align="center">Out 0</td><td>Chorused Output</td></tr>
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</table>
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<h3>Functions</h3>
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<p class=func><span class=keyword>begin</span>(delayBuffer, length, n_chorus);</p>
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<p class=desc>Create a chorus by specifying the address of the delayline, the
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total number of samples in the delay line (often done as an integer multiple of
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AUDIO_BLOCK_SAMPLES) and the number of voices in the chorus <em>including</em>
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the original voice (so, 2 and up to get a chorus effect, although you can
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specify 1 if you want).
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</p>
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<p class=func><span class=keyword>modify</span>(n_chorus);</p>
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<p class=desc>Alters the number of voices in a running chorus (previously started with begin).
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</p>
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<h3>Examples</h3>
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<p class=exam>File > Examples > Audio > Effects > Chorus
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</p>
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<h3>Notes</h3>
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<p>The longer the length of the chorus, the more memory blocks are used.</p>
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</script>
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<script type="text/x-red" data-template-name="AudioEffectChorus">
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<div class="form-row">
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<label for="node-input-name"><i class="fa fa-tag"></i> Name</label>
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<input type="text" id="node-input-name" placeholder="Name">
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</div>
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</script>
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