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<div class="refentry" title="tablexkt">
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<h2>
<span class="refentrytitle">tablexkt</span>
</h2>
<p>tablexkt —
Reads function tables with linear, cubic, or sinc interpolation.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp48134440"></a>
<h2>Description</h2>
<p>
Reads function tables with linear, cubic, or sinc interpolation.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp48194720"></a>
<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>tablexkt</strong></span> xndx, kfn, kwarp, iwsize [, ixmode] [, ixoff] [, iwrap]</pre>
</div>
<div class="refsect1" title="Initialization">
<a id="idp48195840"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>iwsize</em></span> -- This parameter controls the type of interpolation to be used:
</p>
<div class="itemizedlist">
<ul class="itemizedlist" type="disc">
<li class="listitem">
<p><span class="emphasis"><em>2:</em></span> Use linear interpolation. This is the lowest quality, but also the fastest mode.</p>
</li>
<li class="listitem">
<p><span class="emphasis"><em>4:</em></span> Cubic interpolation. Slightly better quality than iwsize = 2, at
the expense of being somewhat slower.</p>
</li>
<li class="listitem">
<p><span class="emphasis"><em>8 and above (up to 1024):</em></span> sinc interpolation with window size set to iwsize (should be an integer multiply of 4). Better quality than linear or cubic interpolation, but very slow. When transposing up, a kwarp value above 1 can be used for anti-aliasing (this is even slower).</p>
</li>
</ul>
</div>
<p>
</p>
<p>
<span class="emphasis"><em>ixmode1</em></span> (optional) -- index data mode. The default value is 0.
</p>
<div class="itemizedlist">
<ul class="itemizedlist" type="disc">
<li class="listitem">
<p><span class="emphasis"><em>0:</em></span> raw index</p>
</li>
<li class="listitem">
<p><span class="emphasis"><em>any non-zero value:</em></span> normalized (0 to 1)</p>
</li>
</ul>
</div>
<p>
</p>
<div class="note" title="Notes" style="margin-left: 0.5in; margin-right: 0.5in;">
<table border="0" summary="Note: Notes">
<tr>
<td rowspan="2" align="center" valign="top" width="25">
<img alt="[Note]" src="images/note.png" />
</td>
<th align="left">Notes</th>
</tr>
<tr>
<td align="left" valign="top">
<p>
if <span class="emphasis"><em>tablexkt</em></span> is used to play back samples with looping (e.g. table index is generated by lphasor), there must be at least iwsize / 2 extra samples after the loop end point for interpolation, otherwise audible clicking may occur (also, at least iwsize / 2 samples should be before the loop start point).
</p>
</td>
</tr>
</table>
</div>
<p>
<span class="emphasis"><em>ixoff</em></span> (optional) -- amount by which index is to be offset. For a table with origin at center, use tablesize / 2 (raw) or 0.5 (normalized). The default value is 0.
</p>
<p>
<span class="emphasis"><em>iwrap</em></span> (optional) -- wraparound index flag. The default value is 0.
</p>
<div class="itemizedlist">
<ul class="itemizedlist" type="disc">
<li class="listitem">
<p><span class="emphasis"><em>0:</em></span> Nowrap (index < 0 treated as index = 0; index >= tablesize (or 1.0 in normalized mode) sticks at the guard point).</p>
</li>
<li class="listitem">
<p><span class="emphasis"><em>any non-zero value:</em></span> Index is wrapped to the allowed range (not including the guard point in this case).</p>
</li>
</ul>
</div>
<p>
</p>
<div class="note" title="Note" style="margin-left: 0.5in; margin-right: 0.5in;">
<table border="0" summary="Note: Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25">
<img alt="[Note]" src="images/note.png" />
</td>
<th align="left">Note</th>
</tr>
<tr>
<td align="left" valign="top">
<p>
<span class="emphasis"><em>iwrap</em></span> also applies to extra samples for interpolation.
</p>
</td>
</tr>
</table>
</div>
</div>
<div class="refsect1" title="Performance">
<a id="idp48206216"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>ares</em></span> -- audio output
</p>
<p>
<span class="emphasis"><em>xndx</em></span> -- table index
</p>
<p>
<span class="emphasis"><em>kfn</em></span> -- function table number
</p>
<p>
<span class="emphasis"><em>kwarp</em></span> -- if greater than 1, use sin (x / kwarp) / x function for sinc interpolation, instead of the default sin (x) / x. This is useful to avoid aliasing when transposing up (<span class="emphasis"><em>kwarp</em></span> should be set to the transpose factor in this case, e.g. 2.0 for one octave), however it makes rendering up to twice as slow. Also, <span class="emphasis"><em>iwsize</em></span> should be at least kwarp * 8. This feature is experimental, and may be optimized both in terms of speed and quality in new versions.
</p>
<div class="note" title="Note" style="margin-left: 0.5in; margin-right: 0.5in;">
<table border="0" summary="Note: Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25">
<img alt="[Note]" src="images/note.png" />
</td>
<th align="left">Note</th>
</tr>
<tr>
<td align="left" valign="top">
<p>
<span class="emphasis"><em>kwarp</em></span> has no effect if it is less than, or equal to 1, or linear or cubic interpolation is used.
</p>
</td>
</tr>
</table>
</div>
</div>
<div class="refsect1" title="Examples">
<a id="idp48210464"></a>
<h2>Examples</h2>
<p>
Here is an example of the tablexkt opcode. It uses the file <a class="ulink" href="examples/tablexkt.csd" target="_top"><em class="citetitle">tablexkt.csd</em></a>.
</p>
<div class="example">
<a id="idp48211456"></a>
<p class="title">
<strong>Example 860. Example of the tablexkt 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>
<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>
<span class="comment">; Audio out Audio in</span>
-odac -iadc <span class="comment">;;;RT audio I/O</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o tablexkt.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="comment">;Example by Jonathan Murphy</span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">ksmps</span> <span class="op">=</span> 10
<span class="ohdr">nchnls</span> <span class="op">=</span> 1
<span class="oblock">instr</span> 1
ifn <span class="op">=</span> 1 <span class="comment">; query f1 as to number of samples</span>
ilen <span class="op">=</span> <span class="opc">nsamp</span>(ifn)
itrns <span class="op">=</span> 4 <span class="comment">; transpose up 4 octaves</span>
ilps <span class="op">=</span> 16 <span class="comment">; allow iwsize/2 samples at start</span>
ilpe <span class="op">=</span> ilen <span class="op">-</span> 16 <span class="comment">; and at end</span>
imode <span class="op">=</span> 3 <span class="comment">; loop forwards and backwards</span>
istrt <span class="op">=</span> 16 <span class="comment">; start 16 samples into loop</span>
alphs <span class="opc">lphasor</span> itrns, ilps, ilpe, imode, istrt
<span class="comment">; use lphasor as index</span>
andx <span class="op">=</span> alphs
kfn <span class="op">=</span> 1 <span class="comment">; read f1</span>
kwarp <span class="op">=</span> 4 <span class="comment">; anti-aliasing, should be same value as itrns above</span>
iwsize <span class="op">=</span> 32 <span class="comment">; iwsize must be at least 8 * kwarp</span>
atab <span class="opc">tablexkt</span> andx, kfn, kwarp, iwsize
atab <span class="op">=</span> atab <span class="op">*</span> 10000
<span class="opc">out</span> atab
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">f</span> 1 0 262144 1 "beats.wav" 0 4 1
<span class="stamnt">i</span>1 0 60
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp48213752"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Istvan Varga</td>
</tr>
<tr>
<td>January 2002</td>
</tr>
<tr>
<td>Example by: Jonathan Murphy 2006</td>
</tr>
</table>
<p>
</p>
<p>New in version 4.18</p>
</div>
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