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<div class="refentry" title="dispfft">
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<h2>
<span class="refentrytitle">dispfft</span>
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<p>displayfft —
Displays the Fourier Transform of an audio or control signal.
</p>
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<div class="refsect1" title="Description">
<a id="idp18412224"></a>
<h2>Description</h2>
<p>
These units will print orchestra init-values, or produce graphic display of orchestra control signals and audio signals. Uses X11 windows if enabled, else (or if <a class="link" href="CommandFlags.html#FlagsMinusLowerG"><em class="citetitle">-g</em></a> flag is set) displays are approximated in ASCII characters.
</p>
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<div class="refsect1" title="Syntax">
<a id="idp18445320"></a>
<h2>Syntax</h2>
<pre class="synopsis"><span class="command"><strong>dispfft</strong></span> xsig, iprd, iwsiz [, iwtyp] [, idbout] [, iwtflg]</pre>
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<div class="refsect1" title="Initialization">
<a id="idp18446320"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>iprd</em></span> -- the period of display in seconds.
</p>
<p>
<span class="emphasis"><em>iwsiz</em></span> -- size of the input window in samples. A window of <span class="emphasis"><em>iwsiz</em></span> points will produce a Fourier transform of <span class="emphasis"><em>iwsiz</em></span>/2 points, spread linearly in frequency from 0 to sr/2. <span class="emphasis"><em>iwsiz</em></span> must be a power of 2, with a minimum of 16 and a maximum of 4096. The windows are permitted to overlap.
</p>
<p>
<span class="emphasis"><em>iwtyp</em></span> (optional, default=0) -- window type. 0 = rectangular, 1 = Hanning. The default value is 0 (rectangular).
</p>
<p>
<span class="emphasis"><em>idbout</em></span> (optional, default=0) -- units of output for the Fourier coefficients. 0 = magnitude, 1 = decibels. The default is 0 (magnitude).
</p>
<p>
<span class="emphasis"><em>iwtflg</em></span> (optional, default=0) -- wait flag. If non-zero, each display is held until released by the user. The default value is 0 (no wait).
</p>
</div>
<div class="refsect1" title="Performance">
<a id="idp18450040"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>dispfft</em></span> -- displays the Fourier Transform of an audio or control signal (<span class="emphasis"><em>asig</em></span> or <span class="emphasis"><em>ksig</em></span>) every <span class="emphasis"><em>iprd</em></span> seconds using the Fast Fourier Transform method.
</p>
</div>
<div class="refsect1" title="Examples">
<a id="idp18451632"></a>
<h2>Examples</h2>
<p>
Here is an example of the dispfft opcode. It uses the file <a class="ulink" href="examples/dispfft.csd" target="_top"><em class="citetitle">dispfft.csd</em></a>.
</p>
<div class="example">
<a id="idp18452608"></a>
<p class="title">
<strong>Example 180. Example of the dispfft 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 dispfft.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
<span class="oblock">instr</span> 1
kcps <span class="op">=</span> 110
ifn <span class="op">=</span> 1
knh <span class="opc">line</span> p4, p3, p5
asig <span class="opc">buzz</span> 1, kcps, knh, ifn
<span class="opc">outs</span> asig, asig
<span class="opc">dispfft</span> asig, .1, 2048, 0, 1
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="comment">;sine wave.</span>
<span class="stamnt">f</span> 1 0 16384 10 1
<span class="stamnt">i</span> 1 0 3 20 20
<span class="stamnt">i</span> 1 + 3 3 3
<span class="stamnt">i</span> 1 + 3 150 1
<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="idp18454888"></a>
<h2>See Also</h2>
<p>
<a class="link" href="display.html" title="display"><em class="citetitle">display</em></a>,
<a class="link" href="print.html" title="print"><em class="citetitle">print</em></a>
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distrib
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Mageia
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x86_64
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media
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core-release
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b707d9a4ee443103660a75ccb6e51334
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files
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