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<div class="refentry" title="ampmidid">
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<h2>
<span class="refentrytitle">ampmidid</span>
</h2>
<p>ampmidid —
Musically map MIDI velocity to peak amplitude within a specified dynamic range in decibels.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp13509696"></a>
<h2>Description</h2>
<p>
Musically map MIDI velocity to peak amplitude within a specified dynamic range in decibels.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp13510520"></a>
<h2>Syntax</h2>
<pre class="synopsis">iamplitude <span class="command"><strong>ampmidid</strong></span> ivelocity, idecibels</pre>
<pre class="synopsis">kamplitude <span class="command"><strong>ampmidid</strong></span> kvelocity, idecibels</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp13521704"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>iamplitude</em></span> -- Amplitude.
</p>
<p>
<span class="emphasis"><em>ivelocity</em></span> -- MIDI velocity number, ranging from 0 through 127.
</p>
<p>
<span class="emphasis"><em>idecibels</em></span> -- Desired dynamic range in decibels.
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp13523632"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>kamplitude</em></span> -- Amplitude.
</p>
<p>
<span class="emphasis"><em>kvelocity</em></span> -- MIDI velocity number, ranging from 0 through 127.
</p>
<p>
Musically map MIDI velocity to peak amplitude
within a specified dynamic range in decibels:
a = (m * v + b) ^ 2,
where a = amplitude,
v = MIDI velocity,
r = 10 ^ (R / 20),
b = 127 / (126 * sqrt( r )) - 1 / 126,
m = (1 - b) / 127,
and R = specified dynamic range in decibels.
See Roger Dannenberg, "The Interpretation of MIDI Velocity,"
in Georg Essl and Ichiro Fujinaga (Eds.), Proceedings of the
2006 International Computer Music Conference,
November 6-11, 2006 (San Francisco:
The International Computer Music Association), pp. 193-196.
</p>
</div>
<div class="refsect1" title="Examples">
<a id="idp13634832"></a>
<h2>Examples</h2>
<p>
Here is an example of the ampmidid opcode. It uses the file <a class="ulink" href="examples/ampmidid.csd" target="_top"><em class="citetitle">ampmidid.csd</em></a>.
</p>
<div class="example">
<a id="idp13635808"></a>
<p class="title">
<strong>Example 49. Example of the ampmidid opcode.</strong>
</p>
<div class="example-contents">
<p>See the sections <a class="link" href="UsingRealTime.html" title="Real-Time Audio"><em class="citetitle">Real-time Audio</em></a> and <a class="link" href="CommandFlags.html" title="Csound command line"><em class="citetitle">Command Line Flags</em></a> for more information on using command line flags.</p>
<pre class="programlisting">
<span class="csdtag"><CsoundSynthesizer></span>
<span class="csdtag"><CsOptions></span>
<span class="comment">; Select audio/midi flags here according to platform</span>
<span class="comment">;;;RT audio out, note=p4 and velocity=p5</span>
-odac --midi-key=4 --midi-velocity-amp=5
<span class="comment">;-iadc ;;;uncomment -iadc if RT audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o ampmidid.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">ksmps</span> <span class="op">=</span> 32
<span class="ohdr">nchnls</span> <span class="op">=</span> 2
<span class="ohdr">massign</span> 0, 1 <span class="comment">;assign all midi to instr. 1</span>
<span class="oblock">instr</span> 1
isine <span class="opc">ftgenonce</span> 0, 0, 4096, 10, 1 <span class="comment">;sine wave</span>
ihz <span class="op">=</span> <span class="opc">cpsmidinn</span>(p4)
ivelocity <span class="op">=</span> p5
idb <span class="opc">ampmidid</span> ivelocity, 20 <span class="comment">;map to dynamic range of 20 dB.</span>
idb <span class="op">=</span> idb <span class="op">+</span> 60 <span class="comment">;limit range to 60 to 80 decibels</span>
iamplitude <span class="op">=</span> <span class="opc">ampdb</span>(idb) <span class="comment">;loudness in dB to signal amplitude</span>
a1 <span class="opc">oscili</span> iamplitude, ihz, isine
aenv <span class="opc">madsr</span> 0.05, 0.1, 0.5, 0.2
asig <span class="op">=</span> a1 <span class="op">*</span> aenv
<span class="opc">outs</span> asig, asig
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="comment">; note velocity</span>
<span class="stamnt">i</span> 1 0 2 61 100
<span class="stamnt">i</span> 1 + 2 65 10
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
</p>
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<div class="refsect1" title="See Also">
<a id="idp13638072"></a>
<h2>See Also</h2>
<p>
<a class="link" href="aftouch.html" title="aftouch"><em class="citetitle">aftouch</em></a>,
<a class="link" href="cpsmidi.html" title="cpsmidi"><em class="citetitle">cpsmidi</em></a>,
<a class="link" href="cpsmidib.html" title="cpsmidib"><em class="citetitle">cpsmidib</em></a>,
<a class="link" href="midictrl.html" title="midictrl"><em class="citetitle">midictrl</em></a>,
<a class="link" href="notnum.html" title="notnum"><em class="citetitle">notnum</em></a>,
<a class="link" href="octmidi.html" title="octmidi"><em class="citetitle">octmidi</em></a>,
<a class="link" href="octmidib.html" title="octmidib"><em class="citetitle">octmidib</em></a>,
<a class="link" href="pchbend.html" title="pchbend"><em class="citetitle">pchbend</em></a>,
<a class="link" href="pchmidi.html" title="pchmidi"><em class="citetitle">pchmidi</em></a>,
<a class="link" href="pchmidib.html" title="pchmidib"><em class="citetitle">pchmidib</em></a>,
<a class="link" href="veloc.html" title="veloc"><em class="citetitle">veloc</em></a>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp13644008"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Michael Gogins</td>
</tr>
<tr>
<td>2006</td>
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