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<h2>
<span class="refentrytitle">atonek</span>
</h2>
<p>atonek —
A hi-pass filter whose transfer functions are the complements of the <a class="link" href="tonek.html" title="tonek"><em class="citetitle">tonek</em></a> opcode.
</p>
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<div class="refsect1">
<a id="idm281472951112040"></a>
<h2>Description</h2>
<p>
A hi-pass filter whose transfer functions are the complements of the <a class="link" href="tonek.html" title="tonek"><em class="citetitle">tonek</em></a> opcode.
</p>
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<div class="refsect1">
<a id="idm281472951069800"></a>
<h2>Syntax</h2>
<pre class="synopsis">kres <span class="command"><strong>atonek</strong></span> ksig, khp [, iskip]</pre>
</div>
<div class="refsect1">
<a id="idm281472951067592"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>iskip</em></span> (optional, default=0) -- initial disposition of internal data space. Since filtering incorporates a feedback loop of previous output, the initial status of the storage space used is significant. A zero value will clear the space; a non-zero value will allow previous information to remain. The default value is 0.
</p>
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<div class="refsect1">
<a id="idm281472951065656"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>kres</em></span> -- the output signal at control-rate.
</p>
<p>
<span class="emphasis"><em>ksig</em></span> -- the input signal at control-rate.
</p>
<p>
<span class="emphasis"><em>khp</em></span> -- the response curve's half-power point, in Hertz. Half power is defined as peak power / root 2.
</p>
<p>
<span class="emphasis"><em>atonek</em></span> is a filter whose transfer functions is the complement of <a class="link" href="tonek.html" title="tonek"><em class="citetitle">tonek</em></a>. <span class="emphasis"><em>atonek</em></span> is thus a form of high-pass filter whose transfer functions represent the <span class="quote">“<span class="quote">filtered out</span>”</span> aspects of their complements. However, power scaling is not normalized in <span class="emphasis"><em>atonek</em></span> but remains the true complement of the corresponding unit.
</p>
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<div class="refsect1">
<a id="idm281472951058984"></a>
<h2>Examples</h2>
<p>
Here is an example of the atonek opcode. It uses the file <a class="ulink" href="examples/atonek.csd" target="_top"><em class="citetitle">atonek.csd</em></a>.
</p>
<div class="example">
<a id="idm281472951057128"></a>
<p class="title">
<strong>Example 59. Example of the atonek 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="idm281472786133960"></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 <span class="c1">;;;RT audio out</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 atonek.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>
gi<span class="n">sin</span> <span class="nb">ftgen</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">2</span><span class="o">^</span><span class="mi">10</span><span class="p">,</span> <span class="mi">10</span><span class="p">,</span> <span class="mi">1</span>
<span class="kd">instr</span> <span class="nf">1</span>
k<span class="n">sig</span> <span class="nb">randomh</span> <span class="mi">400</span><span class="p">,</span> <span class="mi">1800</span><span class="p">,</span> <span class="mi">150</span>
a<span class="n">out</span> <span class="nb">poscil</span> <span class="mf">.2</span><span class="p">,</span> <span class="mi">1000</span><span class="o">+</span>k<span class="n">sig</span><span class="p">,</span> gi<span class="n">sin</span>
<span class="nb">outs</span> a<span class="n">out</span><span class="p">,</span> a<span class="n">out</span>
<span class="kd">endin</span>
<span class="kd">instr</span> <span class="nf">2</span>
k<span class="n">sig</span> <span class="nb">randomh</span> <span class="mi">400</span><span class="p">,</span> <span class="mi">1800</span><span class="p">,</span> <span class="mi">150</span>
k<span class="n">hp</span> <span class="nb">line</span> <span class="mi">1</span><span class="p">,</span> <span class="nb">p3</span><span class="p">,</span> <span class="mi">400</span> <span class="c1">;vary high-pass</span>
k<span class="n">sig</span> <span class="nb">atonek</span> k<span class="n">sig</span><span class="p">,</span> k<span class="n">hp</span>
a<span class="n">out</span> <span class="nb">poscil</span> <span class="mf">.2</span><span class="p">,</span> <span class="mi">1000</span><span class="o">+</span>k<span class="n">sig</span><span class="p">,</span> gi<span class="n">sin</span>
<span class="nb">outs</span> a<span class="n">out</span><span class="p">,</span> a<span class="n">out</span>
<span class="kd">endin</span>
<span class="nt"></CsInstruments></span>
<span class="nt"><CsScore></span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">5</span>
<span class="nb">i</span> <span class="mi">2</span> <span class="mf">5.5</span> <span class="mi">5</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="idm281472951052840"></a>
<h2>See Also</h2>
<p>
<a class="link" href="areson.html" title="areson"><em class="citetitle">areson</em></a>,
<a class="link" href="aresonk.html" title="aresonk"><em class="citetitle">aresonk</em></a>,
<a class="link" href="atone.html" title="atone"><em class="citetitle">atone</em></a>,
<a class="link" href="port.html" title="port"><em class="citetitle">port</em></a>,
<a class="link" href="portk.html" title="portk"><em class="citetitle">portk</em></a>,
<a class="link" href="reson.html" title="reson"><em class="citetitle">reson</em></a>,
<a class="link" href="resonk.html" title="resonk"><em class="citetitle">resonk</em></a>,
<a class="link" href="tone.html" title="tone"><em class="citetitle">tone</em></a>,
<a class="link" href="tonek.html" title="tonek"><em class="citetitle">tonek</em></a>
</p>
</div>
<div class="refsect1">
<a id="idm281472951043112"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
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<td>Author: Robin Whittle</td>
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<td>Australia</td>
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<td>May 1997</td>
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