<?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>ampdb</title> <link rel="stylesheet" type="text/css" href="csound.css" /> <link rel="stylesheet" type="text/css" href="syntax-highlighting.css" /> <meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /> <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="alwayson.html" title="alwayson" /> <link rel="next" href="ampdbfs.html" title="ampdbfs" /> </head> <body> <div class="navheader"> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">ampdb</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="alwayson.html">Prev</a> </td> <th width="60%" align="center">Orchestra Opcodes and Operators</th> <td width="20%" align="right"> <a accesskey="n" href="ampdbfs.html">Next</a></td> </tr> </table> <hr /> </div> <div class="refentry"> <a id="ampdb"></a> <div class="titlepage"></div> <a id="IndexAmpdb" class="indexterm"></a> <div class="refnamediv"> <h2> <span class="refentrytitle">ampdb</span> </h2> <p>ampdb — Returns the amplitude equivalent of the decibel value x. </p> </div> <div class="refsect1"> <a id="idm281472951621880"></a> <h2>Description</h2> <p> Returns the amplitude equivalent of the decibel value x. Thus: </p> <div class="itemizedlist"> <ul class="itemizedlist" style="list-style-type: disc; "> <li class="listitem"> <p>60 dB = 1000</p> </li> <li class="listitem"> <p>66 dB = 1995.262</p> </li> <li class="listitem"> <p>72 dB = 3891.07</p> </li> <li class="listitem"> <p>78 dB = 7943.279</p> </li> <li class="listitem"> <p>84 dB = 15848.926</p> </li> <li class="listitem"> <p>90 dB = 31622.764</p> </li> </ul> </div> <p> </p> </div> <div class="refsect1"> <a id="idm281472951606600"></a> <h2>Syntax</h2> <pre class="synopsis"><span class="command"><strong>ampdb</strong></span>(x) (no rate restriction)</pre> </div> <div class="refsect1"> <a id="idm281472951604504"></a> <h2>Examples</h2> <p> Here is an example of the ampdb opcode. It uses the file <a class="ulink" href="examples/ampdb.csd" target="_top"><em class="citetitle">ampdb.csd</em></a>. </p> <div class="example"> <a id="idm281472951549688"></a> <p class="title"> <strong>Example 52. Example of the ampdb 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="idm281472982097608"></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> -odac <span class="c1">;;;RT audio out</span> <span class="c1">;-iadc ;;;uncomment -iadc if RT audio input is needed too</span> <span class="c1">; For Non-realtime ouput leave only the line below:</span> <span class="c1">; -o ampdb.wav -W ;;; for file output any platform</span> <span class="nt"></CsOptions></span> <span class="nt"><CsInstruments></span> <span class="vg">sr</span> <span class="o">=</span> <span class="mi">44100</span> <span class="vg">ksmps</span> <span class="o">=</span> <span class="mi">32</span> <span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">2</span> <span class="kd">instr</span> <span class="nf">1</span> i<span class="n">db</span> <span class="o">=</span> <span class="nb">p4</span> i<span class="n">amp</span> <span class="o">=</span> <span class="nb">ampdb</span><span class="p">(</span>i<span class="n">db</span><span class="p">)</span> a<span class="n">sig</span> <span class="nb">oscil</span> i<span class="n">amp</span><span class="p">,</span> <span class="mi">220</span> <span class="nb">print</span> i<span class="n">amp</span> <span class="nb">outs</span> a<span class="n">sig</span><span class="p">,</span> a<span class="n">sig</span> <span class="kd">endin</span> <span class="nt"></CsInstruments></span> <span class="nt"><CsScore></span> <span class="nb">i</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">1</span> <span class="mi">50</span> <span class="nb">i</span> <span class="mi">1</span> <span class="o">+</span> <span class="mi">1</span> <span class="mi">90</span> <span class="nb">i</span> <span class="mi">1</span> <span class="o">+</span> <span class="mi">1</span> <span class="mi">68</span> <span class="nb">i</span> <span class="mi">1</span> <span class="o">+</span> <span class="mi">1</span> <span class="mi">80</span> <span class="nb">e</span> <span class="nt"></CsScore></span> <span class="nt"></CsoundSynthesizer></span> </pre> </div> </div> </div> <p><br class="example-break" /> Its output should include lines like: </p> <pre class="screen"> instr 1: iamp = 316.228 instr 1: iamp = 31622.763 instr 1: iamp = 2511.886 instr 1: iamp = 9999.996 </pre> <p> </p> </div> <div class="refsect1"> <a id="idm281472951544632"></a> <h2>See Also</h2> <p> <a class="link" href="ampdbfs.html" title="ampdbfs"><em class="citetitle">ampdbfs</em></a>, <a class="link" href="db.html" title="db"><em class="citetitle">db</em></a>, <a class="link" href="dbamp.html" title="dbamp"><em class="citetitle">dbamp</em></a>, <a class="link" href="dbfsamp.html" title="dbfsamp"><em class="citetitle">dbfsamp</em></a> </p> </div> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="alwayson.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="ampdbfs.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">alwayson </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> ampdbfs</td> </tr> </table> </div> </body> </html>