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<h2>
<span class="refentrytitle">wguide1</span>
</h2>
<p>wguide1 —
A simple waveguide model consisting of one delay-line and one first-order lowpass filter.
</p>
</div>
<div class="refsect1">
<a id="idm281472868826648"></a>
<h2>Description</h2>
<p>
A simple waveguide model consisting of one delay-line and one first-order lowpass filter.
</p>
</div>
<div class="refsect1">
<a id="idm281472868825208"></a>
<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>wguide1</strong></span> asig, xfreq, kcutoff, kfeedback</pre>
</div>
<div class="refsect1">
<a id="idm281472868822952"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>asig</em></span> -- the input of excitation noise.
</p>
<p>
<span class="emphasis"><em>xfreq</em></span> -- the frequency (i.e. the inverse of delay time) Changed to x-rate in Csound version 3.59.
</p>
<p>
<span class="emphasis"><em>kcutoff</em></span> -- the filter cutoff frequency in Hz.
</p>
<p>
<span class="emphasis"><em>kfeedback</em></span> -- the feedback factor.
</p>
<p>
<span class="emphasis"><em>wguide1</em></span> is the most elemental waveguide model, consisting of one delay-line and one first-order lowpass filter.
</p>
<p>
Implementing waveguide algorithms as opcodes, instead of orc instruments, allows the user to set <span class="emphasis"><em>kr</em></span> different than <span class="emphasis"><em>sr</em></span>, allowing better performance particulary when using real-time.
</p>
<p>
</p>
<div class="mediaobject">
<img src="images/wguide1.png" alt="wguide1." />
<div class="caption">
<p>wguide1.</p>
</div>
</div>
<p>
</p>
</div>
<div class="refsect1">
<a id="idm281472868747656"></a>
<h2>Examples</h2>
<p>
Here is an example of the wguide1 opcode. It uses the file <a class="ulink" href="examples/wguide1.csd" target="_top"><em class="citetitle">wguide1.csd</em></a>.
</p>
<div class="example">
<a id="idm281472868745880"></a>
<p class="title">
<strong>Example 1129. Example of the wguide1 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="idm281472688618584"></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 No messages</span>
-odac -iadc -d <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 wguide1.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">4410</span>
<span class="vg">ksmps</span> <span class="o">=</span> <span class="mi">10</span>
<span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">1</span>
<span class="c1">; Instrument #1 - a simple noise waveform.</span>
<span class="kd">instr</span> <span class="nf">1</span>
<span class="c1">; Generate some noise.</span>
a<span class="n">sig</span> <span class="nb">noise</span> <span class="mi">20000</span><span class="p">,</span> <span class="mf">0.5</span>
<span class="nb">out</span> a<span class="n">sig</span>
<span class="kd">endin</span>
<span class="c1">; Instrument #2 - a waveguide example.</span>
<span class="kd">instr</span> <span class="nf">2</span>
<span class="c1">; Generate some noise.</span>
a<span class="n">sig</span> <span class="nb">noise</span> <span class="mi">20000</span><span class="p">,</span> <span class="mf">0.5</span>
<span class="c1">; Run it through a wave-guide model.</span>
k<span class="n">freq</span> <span class="nb">init</span> <span class="mi">200</span>
k<span class="n">cutoff</span> <span class="nb">init</span> <span class="mi">3000</span>
k<span class="n">feedback</span> <span class="nb">init</span> <span class="mf">0.8</span>
a<span class="n">wg1</span> <span class="nb">wguide1</span> a<span class="n">sig</span><span class="p">,</span> k<span class="n">freq</span><span class="p">,</span> k<span class="n">cutoff</span><span class="p">,</span> k<span class="n">feedback</span>
<span class="nb">out</span> a<span class="n">wg1</span>
<span class="kd">endin</span>
<span class="nt"></CsInstruments></span>
<span class="nt"><CsScore></span>
<span class="c1">; Play Instrument #1 for 2 seconds.</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">2</span>
<span class="c1">; Play Instrument #2 for 2 seconds.</span>
<span class="nb">i</span> <span class="mi">2</span> <span class="mi">2</span> <span class="mi">2</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="idm281472868741656"></a>
<h2>See Also</h2>
<p>
<a class="link" href="wguide2.html" title="wguide2"><em class="citetitle">wguide2</em></a>
</p>
</div>
<div class="refsect1">
<a id="idm281472868739544"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Gabriel Maldonado</td>
</tr>
<tr>
<td>Italy</td>
</tr>
<tr>
<td>October 1998</td>
</tr>
</table>
<p>
</p>
<p>Example written by Kevin Conder.</p>
<p>New in Csound version 3.49</p>
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