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<div class="refentry" title="upsamp">
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<a id="IndexUpsamp" class="indexterm"></a>
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<h2>
<span class="refentrytitle">upsamp</span>
</h2>
<p>upsamp —
Modify a signal by up-sampling.
</p>
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<div class="refsect1" title="Description">
<a id="idp49841848"></a>
<h2>Description</h2>
<p>
Modify a signal by up-sampling.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp49842488"></a>
<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>upsamp</strong></span> ksig</pre>
</div>
<div class="refsect1" title="Performance">
<a id="idp49887272"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>upsamp</em></span> converts a control signal to an audio signal. It does it by simple repetition of the kval. <span class="emphasis"><em>upsamp</em></span> is a slightly more efficient form of the assignment, <span class="emphasis"><em>asig</em></span> = <span class="emphasis"><em>ksig</em></span>.
</p>
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<div class="refsect1" title="Examples">
<a id="idp49888880"></a>
<h2>Examples</h2>
<p>
Here is an example of the upsamp opcode. It uses the file <a class="ulink" href="examples/upsamp.csd" target="_top"><em class="citetitle">upsamp.csd</em></a>.
</p>
<div class="example">
<a id="idp49889848"></a>
<p class="title">
<strong>Example 909. Example of the upsamp opcode.</strong>
</p>
<div class="example-contents">
<pre class="programlisting">
<span class="csdtag"><CsoundSynthesizer></span>
<span class="csdtag"><CsOptions></span>
<span class="comment">; Select audio/midi flags here according to platform</span>
-odac <span class="comment">;;;realtime audio out</span>
<span class="comment">;-iadc ;;;uncomment -iadc if RT audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o upsamp.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="comment">;;with code from Steven Cook / David Akbari, Menno Knevel and Joachim Heintz</span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">ksmps</span> <span class="op">=</span> 32
<span class="ohdr">nchnls</span> <span class="op">=</span> 2
<span class="ohdr">0dbfs</span> <span class="op">=</span> 1
<span class="ohdr">seed</span> 0
<span class="oblock">opcode</span> Decimator, a, akk <span class="comment">;UDO Sample rate / Bit depth reducer</span>
<span class="comment">;see http://www.csounds.com/udo/displayOpcode.php?opcode_id=73</span>
<span class="opc">setksmps</span> 1
ain, kbit, ksrate <span class="opc">xin</span>
kbits <span class="op">=</span> 2^kbit <span class="comment">;bit depth (1 to 16)</span>
kfold <span class="op">=</span> (<span class="ohdr">sr</span><span class="op">/</span>ksrate) <span class="comment">;sample rate</span>
kin <span class="opc">downsamp</span> ain <span class="comment">;convert to kr</span>
kin <span class="op">=</span> (kin<span class="op">+</span>0dbfs) <span class="comment">;add DC to avoid (-)</span>
kin <span class="op">=</span> kin<span class="op">*</span>(kbits<span class="op">/</span>(<span class="ohdr">0dbfs</span><span class="op">*</span>2)) <span class="comment">;scale signal level</span>
kin <span class="op">=</span> <span class="opc">int</span>(kin) <span class="comment">;quantise</span>
aout <span class="opc">upsamp</span> kin <span class="comment">;convert to sr</span>
aout <span class="op">=</span> aout<span class="op">*</span>(2<span class="op">/</span>kbits)<span class="op">-</span><span class="ohdr">0dbfs</span> <span class="comment">;rescale and remove DC</span>
a0ut <span class="opc">fold</span> aout, kfold <span class="comment">;resample</span>
<span class="opc">xout</span> a0ut
<span class="oblock">endop</span>
<span class="oblock">instr</span> 1 <span class="comment">;avoid playing this too loud</span>
kbit <span class="op">=</span> p4
ksr <span class="op">=</span> 44100
asig <span class="opc">diskin</span> "fox.wav", 1
aout Decimator asig, kbit, ksr
<span class="opc">printks</span> "bitrate <span class="op">=</span> <span class="op">%</span>d, ", 3, kbit
<span class="opc">printks</span> "with samplerate <span class="op">=</span> <span class="op">%</span>d\\n", 3, ksr
<span class="opc">outs</span> aout<span class="op">*</span>.7, aout<span class="op">*</span>.7
<span class="oblock">endin</span>
<span class="oblock">instr</span> 2 <span class="comment">;moving randomly between different bit values (1 - 6)</span>
kbit <span class="opc">randomi</span> 1, 6, .5, 1
asig <span class="opc">diskin</span> "fox.wav", 1, 0, 1 <span class="comment">;loop play</span>
aout Decimator asig, kbit, 44100
<span class="opc">printks</span> "bitrate <span class="op">=</span> <span class="op">%</span>f\n", .3, kbit
<span class="opc">outs</span> aout<span class="op">*</span>.7, aout<span class="op">*</span>.7
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">i</span> 1 0 3 16 <span class="comment">;sounds allright but</span>
<span class="stamnt">i</span> 1 + 3 5 <span class="comment">;it's getting worse</span>
<span class="stamnt">i</span> 1 + 3 2 <span class="comment">;and worse...</span>
<span class="stamnt">i</span> 2 9 22 <span class="comment">;or quality moves randomly</span>
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
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<p><br class="example-break" />
</p>
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<div class="refsect1" title="See Also">
<a id="idp49890856"></a>
<h2>See Also</h2>
<p>
<a class="link" href="diff.html" title="diff"><em class="citetitle">diff</em></a>,
<a class="link" href="downsamp.html" title="downsamp"><em class="citetitle">downsamp</em></a>,
<a class="link" href="integ.html" title="integ"><em class="citetitle">integ</em></a>,
<a class="link" href="interp.html" title="interp"><em class="citetitle">interp</em></a>,
<a class="link" href="samphold.html" title="samphold"><em class="citetitle">samphold</em></a>
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