<?xml version="1.0" encoding="UTF-8" standalone="no"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>tableimix</title> <link rel="stylesheet" type="text/css" href="csound.css" /> <meta name="generator" content="DocBook XSL Stylesheets V1.76.1" /> <link rel="home" href="index.html" title="The Canonical Csound Reference Manual" /> <link rel="up" href="OpcodesTop.html" title="Orchestra Opcodes and Operators" /> <link rel="prev" href="tableikt.html" title="tableikt" /> <link rel="next" href="tableiw.html" title="tableiw" /> </head> <body> <div class="navheader"> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">tableimix</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="tableikt.html">Prev</a> </td> <th width="60%" align="center">Orchestra Opcodes and Operators</th> <td width="20%" align="right"> <a accesskey="n" href="tableiw.html">Next</a></td> </tr> </table> <hr /> </div> <div class="refentry" title="tableimix"> <a id="tableimix"></a> <div class="titlepage"></div> <a id="IndexTableimix" class="indexterm"></a> <div class="refnamediv"> <h2> <span class="refentrytitle">tableimix</span> </h2> <p>tableimix — Mixes two tables. </p> </div> <div class="refsect1" title="Description"> <a id="idp47482496"></a> <h2>Description</h2> <p> Mixes two tables. </p> </div> <div class="refsect1" title="Syntax"> <a id="idp47483128"></a> <h2>Syntax</h2> <pre class="synopsis"><span class="command"><strong>tableimix</strong></span> idft, idoff, ilen, is1ft, is1off, is1g, is2ft, is2off, is2g</pre> </div> <div class="refsect1" title="Initialization"> <a id="idp47486616"></a> <h2>Initialization</h2> <p> <span class="emphasis"><em>idft</em></span> -- Destination function table. </p> <p> <span class="emphasis"><em>idoff</em></span> -- Offset to start writing from. Can be negative. </p> <p> <span class="emphasis"><em>ilen</em></span> -- Number of write operations to perform. Negative means work backwards. </p> <p> <span class="emphasis"><em>is1ft</em></span>, <span class="emphasis"><em>is2ft</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>is1off</em></span>, <span class="emphasis"><em>is2off</em></span> -- Offsets to start reading from in source tables. </p> <p> <span class="emphasis"><em>is1g</em></span>, <span class="emphasis"><em>is2g</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> </div> <div class="refsect1" title="Performance"> <a id="idp47567544"></a> <h2>Performance</h2> <p> <span class="emphasis"><em>tableimix</em></span> -- This opcode mixes from two tables, with separate gains into the destination table. Writing is done for <span class="emphasis"><em>ilen</em></span> locations, usually stepping forward through the table - if <span class="emphasis"><em>ilen</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>ilen</em></span> is 0, no writing occurs. Note that the internal integer value of <span class="emphasis"><em>ilen</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>ilen</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>ilen</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="tableigpw.html" title="tableigpw"><em class="citetitle">tableigpw</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>ilen</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="idp47573424"></a> <h2>Examples</h2> <p> Here is an example of the tableimix opcode. It uses the file <a class="ulink" href="examples/tableimix.csd" target="_top"><em class="citetitle">tableimix.csd</em></a>. </p> <div class="example"> <a id="idp47574416"></a> <p class="title"> <strong>Example 853. Example of the tableimix 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 tableimix.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 gisine <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">;used to mix</span> <span class="oblock">instr</span> 1 <span class="opc">tableimix</span> 100, 0, 256, 1, 0, 1, 2, 0, .5 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 5 <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="idp47576696"></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="tablemix.html" title="tablemix"><em class="citetitle">tablemix</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> </p> </div> <div class="refsect1" title="Credits"> <a id="idp47579632"></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> </div> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="tableikt.html">Prev</a> </td> <td width="20%" align="center"> <a accesskey="u" href="OpcodesTop.html">Up</a> </td> <td width="40%" align="right"> <a accesskey="n" href="tableiw.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">tableikt </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> tableiw</td> </tr> </table> </div> </body> </html>