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<div class="refentry" title="max_k">
<a id="max_k"></a>
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<a id="Indexmax_k" class="indexterm"></a>
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<h2>
<span class="refentrytitle">max_k</span>
</h2>
<p>max_k —
Local maximum (or minimum) value of an incoming asig signal
</p>
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<div class="refsect1" title="Description">
<a id="idp30506008"></a>
<h2>Description</h2>
<p>
<span class="emphasis"><em>max_k</em></span> outputs the local maximum (or minimum) value of the incoming asig signal, checked in the time interval between ktrig has become true twice.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp30506960"></a>
<h2>Syntax</h2>
<pre class="synopsis">knumkout <span class="command"><strong>max_k</strong></span> asig, ktrig, itype</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp30517416"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>itype</em></span> - itype determinates the behaviour of max_k (see below)
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp30518296"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>asig</em></span> - incoming (input) signal
</p>
<p>
<span class="emphasis"><em>ktrig</em></span> - trigger signal
</p>
<p>
max_k outputs the local maximum (or minimum) value of the incoming <span class="emphasis"><em>asig</em></span> signal, checked in the time interval between <span class="emphasis"><em>ktrig</em></span> has become true twice. <span class="emphasis"><em>itype</em></span> determinates the behaviour of max_k:</p>
<p>
1 - absolute maximum (sign of negative values is changed to positive before evaluation).
</p>
<p>
2 - actual maximum.
</p>
<p>
3 - actual minimum.
</p>
<p>
4 - calculate average value of <span class="emphasis"><em>asig</em></span> in the
time interval since the last trigger.
</p>
<p>
This opcode can be useful in several situations, for example to implement a vu-meter.
</p>
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<div class="refsect1" title="Examples">
<a id="idp30557096"></a>
<h2>Examples</h2>
<p>
Here is an example of the max_k opcode. It uses the file <a class="ulink" href="examples/max_k.csd" target="_top"><em class="citetitle">max_k.csd</em></a>.
</p>
<div class="example">
<a id="idp30557992"></a>
<p class="title">
<strong>Example 445. Example of the max_k 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>
-odac -Ma <span class="comment">;;;realtime audio out and midi in (on all inputs)</span>
<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 max_k.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">0dbfs</span> <span class="op">=</span> 1
<span class="opc">FLpanel</span> "This Panel contains VU<span class="op">-</span>meter",300,100
gk1,gih1 <span class="opc">FLslider</span> "VU<span class="op">-</span>meter", 0,1,0,1, <span class="op">-</span>1, 250,30, 30,30
<span class="opc">FLsetColor2</span> 50, 50, 255, gih1
<span class="opc">FLpanel_end</span>
<span class="opc">FLrun</span>
ga1 <span class="opc">init</span> 0
<span class="oblock">instr</span> 1
kenv <span class="opc">linsegr</span> 0,.5,.7,.5,.5,.2,0
ifreq <span class="opc">cpsmidi</span>
a1 <span class="opc">poscil</span> <span class="ohdr">0dbfs</span><span class="op">*</span>kenv, ifreq, 1
ga1 <span class="op">=</span> ga1<span class="op">+</span>a1
<span class="oblock">endin</span>
<span class="oblock">instr</span> 2
<span class="opc">outs</span> ga1, ga1
ktrig <span class="opc">metro</span> 25 <span class="comment">;refresh 25 times per second</span>
kval <span class="opc">max_k</span> ga1, ktrig, 1
<span class="opc">FLsetVal</span> ktrig, kval, gih1
ga1 <span class="op">=</span> 0
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">f</span>1 0 1024 10 1
<span class="stamnt">i</span>2 0 3600
<span class="stamnt">f</span>0 3600
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp30560264"></a>
<h2>Credits</h2>
<p>Written by Gabriel Maldonado.</p>
<p>New in Csound 5 (Previously available only on
CsoundAV)</p>
<p>Fixed to agree with documentation in 5.15</p>
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