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<div class="refentry" title="tablemix">
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<h2>
<span class="refentrytitle">tablemix</span>
</h2>
<p>tablemix —
Mixes two tables.
</p>
</div>
<div class="refsect1" title="Description">
<a id="idp47657312"></a>
<h2>Description</h2>
<p>
Mixes two tables.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp47657944"></a>
<h2>Syntax</h2>
<pre class="synopsis"><span class="command"><strong>tablemix</strong></span> kdft, kdoff, klen, ks1ft, ks1off, ks1g, ks2ft, ks2off, ks2g</pre>
</div>
<div class="refsect1" title="Performance">
<a id="idp47661432"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>kdft</em></span> -- Destination function table.
</p>
<p>
<span class="emphasis"><em>kdoff</em></span> -- Offset to start writing from. Can be negative.
</p>
<p>
<span class="emphasis"><em>klen</em></span> -- Number of write operations to perform. Negative means work backwards.
</p>
<p>
<span class="emphasis"><em>ks1ft</em></span>, <span class="emphasis"><em>ks2ft</em></span> -- Source function tables. These can be the same as the destination table, if care is exercised about direction of copying data.
</p>
<p>
<span class="emphasis"><em>ks1off</em></span>, <span class="emphasis"><em>ks2off</em></span> -- Offsets to start reading from in source tables.
</p>
<p>
<span class="emphasis"><em>ks1g</em></span>, <span class="emphasis"><em>ks2g</em></span> -- Gains to apply when reading from the source tables. The results are added and the sum is written to the destination table.
</p>
<p>
<span class="emphasis"><em>tablemix</em></span> -- This opcode mixes from two tables, with separate gains into the destination table. Writing is done for <span class="emphasis"><em>klen</em></span> locations, usually stepping forward through the table - if <span class="emphasis"><em>klen</em></span> is positive. If it is negative, then the writing and reading order is backwards - towards lower indexes in the tables. This bi-directional option makes it easy to shift the contents of a table sideways by reading from it and writing back to it with a different offset.
</p>
<p>
If <span class="emphasis"><em>klen</em></span> is 0, no writing occurs. Note that the internal integer value of <span class="emphasis"><em>klen</em></span> is derived from the ANSI C floor() function - which returns the next most negative integer. Hence a fractional negative <span class="emphasis"><em>klen</em></span> value of -2.3 would create an internal length of 3, and cause the copying to start from the offset locations and proceed for two locations to the left.
</p>
<p>
The total index for table reading and writing is calculated from the starting offset for each table, plus the index value, which starts at 0 and then increments (or decrements) by 1 as mixing proceeds.
</p>
<p>
These total indexes can potentially be very large, since there is no restriction on the offset or the <span class="emphasis"><em>klen</em></span>. However each total index for each table is ANDed with a length mask (such as 0000 0111 for a table of length 8) to form a final index which is actually used for reading or writing. So no reading or writing can occur outside the tables. This is the same as <span class="quote">“<span class="quote">wrap</span>”</span> mode in table read and write. These opcodes do not read or write the guardpoint. If a table has been rewritten with one of these, then if it has a guardpoint which is supposed to contain the same value as the location 0, then call <a class="link" href="tablegpw.html" title="tablegpw"><em class="citetitle">tablegpw</em></a> afterwards.
</p>
<p>
The indexes and offsets are all in table steps - they are not normalized to 0 - 1. So for a table of length 256, <span class="emphasis"><em>klen</em></span> should be set to 256 if all the table was to be read or written.
</p>
<p>
The tables do not need to be the same length - wrapping occurs individually for each table.
</p>
</div>
<div class="refsect1" title="Examples">
<a id="idp47724296"></a>
<h2>Examples</h2>
<p>
Here is an example of the tablemix opcode. It uses the file <a class="ulink" href="examples/tablemix.csd" target="_top"><em class="citetitle">tablemix.csd</em></a>.
</p>
<div class="example">
<a id="idp47725280"></a>
<p class="title">
<strong>Example 856. Example of the tablemix 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>
-odac <span class="comment">;;;realtime audio out</span>
<span class="comment">;-iadc ;;;uncomment -iadc if realtime audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o tablemix.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></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
gisinoid <span class="ohdr">ftgen</span> 1, 0, 256, 10, 1, 0, 0, .4 <span class="comment">;sinoid</span>
gisaw <span class="ohdr">ftgen</span> 2, 0, 1024, 7, 0, 256, 1 <span class="comment">;saw</span>
gimix <span class="ohdr">ftgen</span> 100, 0, 256, 7, 0, 256, 1 <span class="comment">;destination table</span>
<span class="oblock">instr</span> 1
kgain <span class="opc">linseg</span> 0, p3<span class="op">*</span>.5, .5, p3<span class="op">*</span>.5, 0
<span class="opc">tablemix</span> 100, 0, 256, 1, 0, 1, 2, 0, kgain
asig <span class="opc">poscil</span> .5, 110, gimix <span class="comment">;mix table 1 & 2 </span>
<span class="opc">outs</span> asig, asig
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">i</span>1 0 10
<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="See Also">
<a id="idp47727560"></a>
<h2>See Also</h2>
<p>
<a class="link" href="tablecopy.html" title="tablecopy"><em class="citetitle">tablecopy</em></a>,
<a class="link" href="tablegpw.html" title="tablegpw"><em class="citetitle">tablegpw</em></a>,
<a class="link" href="tableicopy.html" title="tableicopy"><em class="citetitle">tableicopy</em></a>,
<a class="link" href="tableigpw.html" title="tableigpw"><em class="citetitle">tableigpw</em></a>,
<a class="link" href="tableimix.html" title="tableimix"><em class="citetitle">tableimix</em></a>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp47730496"></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 3.47</p>
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