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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">
<a id="idm281472951466184"></a>
<h2>Description</h2>
<p>
Musically map MIDI velocity to peak amplitude within a specified dynamic range in decibels.
</p>
</div>
<div class="refsect1">
<a id="idm281472951396248"></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">
<a id="idm281472951392600"></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">
<a id="idm281472951389032"></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">
<a id="idm281472951384984"></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="idm281472951383208"></a>
<p class="title">
<strong>Example 55. 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>
<div class="refsect1">
<a id="idm281472786746696"></a>
<pre class="programlisting">
<span class="nt"><CsoundSynthesizer></span>
<span class="nt"><CsOptions></span>
<span class="c1">; Select audio/midi flags here according to platform</span>
<span class="c1">;;;RT audio out, note=p4 and velocity=p5</span>
-odac --midi-key=4 --midi-velocity-amp=5
<span class="c1">;-iadc ;;;uncomment -iadc if RT audio input is needed too</span>
<span class="c1">; For Non-realtime ouput leave only the line below:</span>
<span class="c1">; -o ampmidid.wav -W ;;; for file output any platform</span>
<span class="nt"></CsOptions></span>
<span class="nt"><CsInstruments></span>
<span class="vg">sr</span> <span class="o">=</span> <span class="mi">44100</span>
<span class="vg">ksmps</span> <span class="o">=</span> <span class="mi">32</span>
<span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">2</span>
<span class="nb">massign</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">1</span> <span class="c1">;assign all midi to instr. 1</span>
<span class="kd">instr</span> <span class="nf">1</span>
i<span class="n">sine</span> <span class="nb">ftgenonce</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">4096</span><span class="p">,</span> <span class="mi">10</span><span class="p">,</span> <span class="mi">1</span> <span class="c1">;sine wave</span>
i<span class="n">hz</span> <span class="o">=</span> <span class="nb">cpsmidinn</span><span class="p">(</span><span class="nb">p4</span><span class="p">)</span>
i<span class="n">velocity</span> <span class="o">=</span> <span class="nb">p5</span>
i<span class="n">db</span> <span class="nb">ampmidid</span> i<span class="n">velocity</span><span class="p">,</span> <span class="mi">20</span> <span class="c1">;map to dynamic range of 20 dB.</span>
i<span class="n">db</span> <span class="o">=</span> i<span class="n">db</span> <span class="o">+</span> <span class="mi">60</span> <span class="c1">;limit range to 60 to 80 decibels</span>
i<span class="n">amplitude</span> <span class="o">=</span> <span class="nb">ampdb</span><span class="p">(</span>i<span class="n">db</span><span class="p">)</span> <span class="c1">;loudness in dB to signal amplitude</span>
a<span class="n">1</span> <span class="nb">oscili</span> i<span class="n">amplitude</span><span class="p">,</span> i<span class="n">hz</span><span class="p">,</span> i<span class="n">sine</span>
a<span class="n">env</span> <span class="nb">madsr</span> <span class="mf">0.05</span><span class="p">,</span> <span class="mf">0.1</span><span class="p">,</span> <span class="mf">0.5</span><span class="p">,</span> <span class="mf">0.2</span>
a<span class="n">sig</span> <span class="o">=</span> a<span class="n">1</span> <span class="o">*</span> a<span class="n">env</span>
<span class="nb">outs</span> a<span class="n">sig</span><span class="p">,</span> a<span class="n">sig</span>
<span class="kd">endin</span>
<span class="nt"></CsInstruments></span>
<span class="nt"><CsScore></span>
<span class="c1">; note velocity</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">2</span> <span class="mi">61</span> <span class="mi">100</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="o">+</span> <span class="mi">2</span> <span class="mi">65</span> <span class="mi">10</span>
<span class="nb">e</span>
<span class="nt"></CsScore></span>
<span class="nt"></CsoundSynthesizer></span>
</pre>
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<p><br class="example-break" />
</p>
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<div class="refsect1">
<a id="idm281472951379016"></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">
<a id="idm281472951367304"></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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