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<h2>
<span class="refentrytitle">peak</span>
</h2>
<p>peak —
Maintains the output equal to the highest absolute value received.
</p>
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<div class="refsect1">
<a id="idm281472904197800"></a>
<h2>Description</h2>
<p>
These opcodes maintain the output k-rate variable as the peak absolute level so far received.
</p>
</div>
<div class="refsect1">
<a id="idm281472904153960"></a>
<h2>Syntax</h2>
<pre class="synopsis">kres <span class="command"><strong>peak</strong></span> asig</pre>
<pre class="synopsis">kres <span class="command"><strong>peak</strong></span> ksig</pre>
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<div class="refsect1">
<a id="idm281472904150280"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>kres</em></span> -- Output equal to the highest absolute value received so far. This is effectively an input to the opcode as well, since it reads <span class="emphasis"><em>kres</em></span> in order to decide whether to write something higher into it.
</p>
<p>
<span class="emphasis"><em>ksig </em></span> -- k-rate input signal.
</p>
<p>
<span class="emphasis"><em>asig </em></span> -- a-rate input signal.
</p>
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<div class="refsect1">
<a id="idm281472904146120"></a>
<h2>Examples</h2>
<p>
Here is an example of the peak opcode. It uses the file <a class="ulink" href="examples/peak.csd" target="_top"><em class="citetitle">peak.csd</em></a>, and <a class="ulink" href="examples/beats.wav" target="_top"><em class="citetitle">beats.wav</em></a>.
</p>
<div class="example">
<a id="idm281472904143496"></a>
<p class="title">
<strong>Example 683. Example of the peak 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="idm281472726628680"></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">; Audio out Audio in</span>
-odac -iadc <span class="c1">;;;RT audio I/O</span>
<span class="c1">; For Non-realtime ouput leave only the line below:</span>
<span class="c1">; -o peak.wav -W ;;; for file output any platform</span>
<span class="nt"></CsOptions></span>
<span class="nt"><CsInstruments></span>
<span class="c1">; Initialize the global variables.</span>
<span class="vg">sr</span> <span class="o">=</span> <span class="mi">44100</span>
<span class="vg">kr</span> <span class="o">=</span> <span class="mi">44100</span>
<span class="vg">ksmps</span> <span class="o">=</span> <span class="mi">1</span>
<span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">1</span>
<span class="c1">; Instrument #1 - play an audio file.</span>
<span class="kd">instr</span> <span class="nf">1</span>
<span class="c1">; Capture the highest amplitude in the "beats.wav" file.</span>
a<span class="n">sig</span> <span class="nb">soundin</span> <span class="s">"beats.wav"</span>
k<span class="n">p</span> <span class="nb">peak</span> a<span class="n">sig</span>
<span class="c1">; Print out the peak value once per second.</span>
<span class="nb">printk</span> <span class="mi">1</span><span class="p">,</span> k<span class="n">p</span>
<span class="nb">out</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">; Play Instrument #1, the audio file, for three seconds.</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">3</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" />
Its output should include lines like this:
</p>
<pre class="screen">
i 1 time 0.00002: 4835.00000
i 1 time 1.00002: 29312.00000
i 1 time 2.00002: 32767.00000
</pre>
<p>
</p>
</div>
<div class="refsect1">
<a id="idm281472904138440"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Robin Whittle</td>
</tr>
<tr>
<td>Australia</td>
</tr>
<tr>
<td>May 1997</td>
</tr>
</table>
<p>
</p>
<p>Example written by Kevin Conder.</p>
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