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<a id="max_k"></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>
</div>
<div class="refsect1">
<a id="idm281472915915032"></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">
<a id="idm281472915911048"></a>
<h2>Syntax</h2>
<pre class="synopsis">knumkout <span class="command"><strong>max_k</strong></span> asig, ktrig, itype</pre>
</div>
<div class="refsect1">
<a id="idm281472915908840"></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">
<a id="idm281472915835448"></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>
</div>
<div class="refsect1">
<a id="idm281472915828328"></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="idm281472915826472"></a>
<p class="title">
<strong>Example 526. 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>
<div class="refsect1">
<a id="idm281472739935544"></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>
-odac -Ma <span class="c1">;;;realtime audio out and midi in (on all inputs)</span>
<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 max_k.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="vg">0dbfs</span> <span class="o">=</span> <span class="mi">1</span>
<span class="nb">FLpanel</span> <span class="s">"This Panel contains VU-meter"</span><span class="p">,</span><span class="mi">300</span><span class="p">,</span><span class="mi">100</span>
gk<span class="n">1</span><span class="p">,</span>gi<span class="n">h1</span> <span class="nb">FLslider</span> <span class="s">"VU-meter"</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span><span class="mi">1</span><span class="p">,</span><span class="mi">0</span><span class="p">,</span><span class="mi">1</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span><span class="p">,</span> <span class="mi">250</span><span class="p">,</span><span class="mi">30</span><span class="p">,</span> <span class="mi">30</span><span class="p">,</span><span class="mi">30</span>
<span class="nb">FLsetColor2</span> <span class="mi">50</span><span class="p">,</span> <span class="mi">50</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> gi<span class="n">h1</span>
<span class="nb">FLpanel_end</span>
<span class="nb">FLrun</span>
ga<span class="n">1</span> <span class="nb">init</span> <span class="mi">0</span>
<span class="kd">instr</span> <span class="nf">1</span>
k<span class="n">env</span> <span class="nb">linsegr</span> <span class="mi">0</span><span class="p">,</span><span class="mf">.5</span><span class="p">,</span><span class="mf">.7</span><span class="p">,</span><span class="mf">.5</span><span class="p">,</span><span class="mf">.5</span><span class="p">,</span><span class="mf">.2</span><span class="p">,</span><span class="mi">0</span>
i<span class="n">freq</span> <span class="nb">cpsmidi</span>
a<span class="n">1</span> <span class="nb">poscil</span> <span class="vg">0dbfs</span><span class="o">*</span>k<span class="n">env</span><span class="p">,</span> i<span class="n">freq</span><span class="p">,</span> <span class="mi">1</span>
ga<span class="n">1</span> <span class="o">=</span> ga<span class="n">1</span><span class="o">+</span>a<span class="n">1</span>
<span class="kd">endin</span>
<span class="kd">instr</span> <span class="nf">2</span>
<span class="nb">outs</span> ga<span class="n">1</span><span class="p">,</span> ga<span class="n">1</span>
k<span class="n">trig</span> <span class="nb">metro</span> <span class="mi">25</span> <span class="c1">;refresh 25 times per second</span>
k<span class="n">val</span> <span class="nb">max_k</span> ga<span class="n">1</span><span class="p">,</span> k<span class="n">trig</span><span class="p">,</span> <span class="mi">1</span>
<span class="nb">FLsetVal</span> k<span class="n">trig</span><span class="p">,</span> k<span class="n">val</span><span class="p">,</span> gi<span class="n">h1</span>
ga<span class="n">1</span> <span class="o">=</span> <span class="mi">0</span>
<span class="kd">endin</span>
<span class="nt"></CsInstruments></span>
<span class="nt"><CsScore></span>
<span class="nb">f</span><span class="mi">1</span> <span class="mi">0</span> <span class="mi">1024</span> <span class="mi">10</span> <span class="mi">1</span>
<span class="nb">i</span><span class="mi">2</span> <span class="mi">0</span> <span class="mi">3600</span>
<span class="nb">f</span><span class="mi">0</span> <span class="mi">3600</span>
<span class="nb">e</span>
<span class="nt"></CsScore></span>
<span class="nt"></CsoundSynthesizer></span>
</pre>
</div>
</div>
</div>
<p><br class="example-break" />
</p>
</div>
<div class="refsect1">
<a id="idm281472915822184"></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>
</div>
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