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<h2>
<span class="refentrytitle">zkmod</span>
</h2>
<p>zkmod —
Facilitates the modulation of one signal by another.
</p>
</div>
<div class="refsect1">
<a id="idm281472866492824"></a>
<h2>Description</h2>
<p>
Facilitates the modulation of one signal by another.
</p>
</div>
<div class="refsect1">
<a id="idm281472866489432"></a>
<h2>Syntax</h2>
<pre class="synopsis">kres <span class="command"><strong>zkmod</strong></span> ksig, kzkmod</pre>
</div>
<div class="refsect1">
<a id="idm281472866487192"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>ksig</em></span> -- the input signal
</p>
<p>
<span class="emphasis"><em>kzkmod</em></span> -- controls which zk variable is used for modulation. A positive value means additive modulation, a negative value means multiplicative modulation. A value of 0 means no change to <span class="emphasis"><em>ksig</em></span>. <span class="emphasis"><em>kzkmod</em></span> can be i-rate or k-rate
</p>
<p>
<span class="emphasis"><em>zkmod</em></span> facilitates the modulation of one signal by another, where the modulating signal comes from a zk variable. Either additive or mulitiplicative modulation can be specified.
</p>
</div>
<div class="refsect1">
<a id="idm281472866410376"></a>
<h2>Examples</h2>
<p>
Here is an example of the zkmod opcode. It uses the file <a class="ulink" href="examples/zkmod.csd" target="_top"><em class="citetitle">zkmod.csd</em></a>.
</p>
<div class="example">
<a id="idm281472866408600"></a>
<p class="title">
<strong>Example 1161. Example of the zkmod 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="idm281472684981032"></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 zkmod.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">2</span>
<span class="c1">; Initialize the ZAK space.</span>
<span class="c1">; Create 2 a-rate variables and 2 k-rate variables.</span>
<span class="nb">zakinit</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">2</span>
<span class="c1">; Instrument #1 -- a signal with jitter.</span>
<span class="kd">instr</span> <span class="nf">1</span>
<span class="c1">; Generate a k-rate signal goes from 30 to 2,000.</span>
k<span class="n">line</span> <span class="nb">line</span> <span class="mi">30</span><span class="p">,</span> <span class="nb">p3</span><span class="p">,</span> <span class="mi">2000</span>
<span class="c1">; Add the signal into zk variable #1.</span>
<span class="nb">zkw</span> k<span class="n">line</span><span class="p">,</span> <span class="mi">1</span>
<span class="kd">endin</span>
<span class="c1">; Instrument #2 -- generates audio output.</span>
<span class="kd">instr</span> <span class="nf">2</span>
<span class="c1">; Create a k-rate signal modulated the jitter opcode.</span>
k<span class="n">amp</span> <span class="nb">init</span> <span class="mi">20</span>
k<span class="n">cpsmin</span> <span class="nb">init</span> <span class="mi">40</span>
k<span class="n">cpsmax</span> <span class="nb">init</span> <span class="mi">60</span>
k<span class="n">jtr</span> <span class="nb">jitter</span> k<span class="n">amp</span><span class="p">,</span> k<span class="n">cpsmin</span><span class="p">,</span> k<span class="n">cpsmax</span>
<span class="c1">; Get the frequency values from zk variable #1.</span>
k<span class="n">freq</span> <span class="nb">zkr</span> <span class="mi">1</span>
<span class="c1">; Add the the frequency values in zk variable #1 to </span>
<span class="c1">; the jitter signal.</span>
k<span class="n">jfreq</span> <span class="nb">zkmod</span> k<span class="n">jtr</span><span class="p">,</span> <span class="mi">1</span>
<span class="c1">; Use a simple sine waveform for the left speaker.</span>
a<span class="n">left</span> <span class="nb">oscil</span> <span class="mi">20000</span><span class="p">,</span> k<span class="n">freq</span><span class="p">,</span> <span class="mi">1</span>
<span class="c1">; Use a sine waveform with jitter for the right speaker.</span>
a<span class="n">right</span> <span class="nb">oscil</span> <span class="mi">20000</span><span class="p">,</span> k<span class="n">jfreq</span><span class="p">,</span> <span class="mi">1</span>
<span class="c1">; Generate the audio output.</span>
<span class="nb">outs</span> a<span class="n">left</span><span class="p">,</span> a<span class="n">right</span>
<span class="c1">; Clear the zk variables, prepare them for </span>
<span class="c1">; another pass.</span>
<span class="nb">zkcl</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">2</span>
<span class="kd">endin</span>
<span class="nt"></CsInstruments></span>
<span class="nt"><CsScore></span>
<span class="c1">; Table #1, a sine wave.</span>
<span class="nb">f</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">16384</span> <span class="mi">10</span> <span class="mi">1</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">0</span> <span class="mi">2</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="idm281472866404376"></a>
<h2>See Also</h2>
<p>
<a class="link" href="zamod.html" title="zamod"><em class="citetitle">zamod</em></a>,
<a class="link" href="zkcl.html" title="zkcl"><em class="citetitle">zkcl</em></a>,
<a class="link" href="zkr.html" title="zkr"><em class="citetitle">zkr</em></a>,
<a class="link" href="zkwm.html" title="zkwm"><em class="citetitle">zkwm</em></a>,
<a class="link" href="zkw.html" title="zkw"><em class="citetitle">zkw</em></a>
</p>
</div>
<div class="refsect1">
<a id="idm281472866398552"></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>New in version 3.45</p>
<p>Example written by Kevin Conder.</p>
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