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DFT (libgdx API)
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SUMMARY: NESTED | <A HREF="#fields_inherited_from_class_com.badlogic.gdx.audio.analysis.FourierTransform">FIELD</A> | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD>
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com.badlogic.gdx.audio.analysis</FONT>
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Class DFT</H2>
<PRE>
java.lang.Object
<IMG SRC="../../../../../resources/inherit.gif" ALT="extended by "><A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html" title="class in com.badlogic.gdx.audio.analysis">com.badlogic.gdx.audio.analysis.FourierTransform</A>
<IMG SRC="../../../../../resources/inherit.gif" ALT="extended by "><B>com.badlogic.gdx.audio.analysis.DFT</B>
</PRE>
<HR>
<DL>
<DT><PRE>public class <B>DFT</B><DT>extends <A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html" title="class in com.badlogic.gdx.audio.analysis">FourierTransform</A></DL>
</PRE>

<P>
DFT stands for Discrete Fourier Transform and is the most widely used Fourier Transform. You will never want to use this class
due to the fact that it is a brute force implementation of the DFT and as such is quite slow. Use an FFT instead. This exists
primarily as a way to ensure that other implementations of the DFT are working properly. This implementation expects an even
<code>timeSize</code> and will throw and IllegalArgumentException if this is not the case.
<P>

<P>
<DL>
<DT><B>Author:</B></DT>
<DD>Damien Di Fede</DD>
<DT><B>See Also:</B><DD><A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html" title="class in com.badlogic.gdx.audio.analysis"><CODE>FourierTransform</CODE></A>,
<A HREF="../../../../../com/badlogic/gdx/audio/analysis/FFT.html" title="class in com.badlogic.gdx.audio.analysis"><CODE>FFT</CODE></A>,
<a href="http://www.dspguide.com/ch8.htm">The Discrete Fourier Transform</a></DL>
<HR>

<P>


<A NAME="field_summary"></A>
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 <A NAME="fields_inherited_from_class_com.badlogic.gdx.audio.analysis.FourierTransform"></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TH ALIGN="left"><B>Fields inherited from class com.badlogic.gdx.audio.analysis.<A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html" title="class in com.badlogic.gdx.audio.analysis">FourierTransform</A></B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#averages">averages</A>, <A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#avgPerOctave">avgPerOctave</A>, <A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#bandWidth">bandWidth</A>, <A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#HAMMING">HAMMING</A>, <A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#imag">imag</A>, <A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#LINAVG">LINAVG</A>, <A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#LOGAVG">LOGAVG</A>, <A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#NOAVG">NOAVG</A>, <A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#NONE">NONE</A>, <A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#octaves">octaves</A>, <A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#real">real</A>, <A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#sampleRate">sampleRate</A>, <A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#spectrum">spectrum</A>, <A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#timeSize">timeSize</A>, <A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#TWO_PI">TWO_PI</A>, <A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#whichAverage">whichAverage</A>, <A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#whichWindow">whichWindow</A></CODE></TD>
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<TD><CODE><B><A HREF="../../../../../com/badlogic/gdx/audio/analysis/DFT.html#DFT(int, float)">DFT</A></B>(int timeSize,
float sampleRate)</CODE>

<BR>
          Constructs a DFT that expects audio buffers of length <code>timeSize</code> that have been recorded with a sample rate of
<code>sampleRate</code>.</TD>
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<CODE>protected  void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../com/badlogic/gdx/audio/analysis/DFT.html#allocateArrays()">allocateArrays</A></B>()</CODE>

<BR>
           </TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../com/badlogic/gdx/audio/analysis/DFT.html#forward(float[])">forward</A></B>(float[] samples)</CODE>

<BR>
          Performs a forward transform on <code>buffer</code>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../com/badlogic/gdx/audio/analysis/DFT.html#inverse(float[])">inverse</A></B>(float[] buffer)</CODE>

<BR>
          Performs an inverse transform of the frequency spectrum and places the result in <code>buffer</code>.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../com/badlogic/gdx/audio/analysis/DFT.html#scaleBand(int, float)">scaleBand</A></B>(int i,
float s)</CODE>

<BR>
          Not currently implemented.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../com/badlogic/gdx/audio/analysis/DFT.html#setBand(int, float)">setBand</A></B>(int i,
float a)</CODE>

<BR>
          Not currently implemented.</TD>
</TR>
</TABLE>
 <A NAME="methods_inherited_from_class_com.badlogic.gdx.audio.analysis.FourierTransform"></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TH ALIGN="left"><B>Methods inherited from class com.badlogic.gdx.audio.analysis.<A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html" title="class in com.badlogic.gdx.audio.analysis">FourierTransform</A></B></TH>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#avgSize()">avgSize</A>, <A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#calcAvg(float, float)">calcAvg</A>, <A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#doWindow(float[])">doWindow</A>, <A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#fillSpectrum()">fillSpectrum</A>, <A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#forward(float[], int)">forward</A>, <A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#freqToIndex(float)">freqToIndex</A>, <A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#getAverageCenterFrequency(int)">getAverageCenterFrequency</A>, <A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#getAvg(int)">getAvg</A>, <A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#getBand(int)">getBand</A>, <A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#getBandWidth()">getBandWidth</A>, <A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#getFreq(float)">getFreq</A>, <A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#getImaginaryPart()">getImaginaryPart</A>, <A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#getRealPart()">getRealPart</A>, <A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#getSpectrum()">getSpectrum</A>, <A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#hamming(float[])">hamming</A>, <A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#indexToFreq(int)">indexToFreq</A>, <A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#inverse(float[], float[], float[])">inverse</A>, <A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#linAverages(int)">linAverages</A>, <A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#logAverages(int, int)">logAverages</A>, <A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#noAverages()">noAverages</A>, <A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#scaleFreq(float, float)">scaleFreq</A>, <A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#setComplex(float[], float[])">setComplex</A>, <A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#setFreq(float, float)">setFreq</A>, <A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#specSize()">specSize</A>, <A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#timeSize()">timeSize</A>, <A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#window(int)">window</A></CODE></TD>
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<TH ALIGN="left"><B>Methods inherited from class java.lang.Object</B></TH>
</TR>
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<TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD>
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<P>



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<A NAME="DFT(int, float)"></A><H3>
DFT</H3>
<PRE>
public <B>DFT</B>(int timeSize,
float sampleRate)</PRE>
<DL>
<DD>Constructs a DFT that expects audio buffers of length <code>timeSize</code> that have been recorded with a sample rate of
<code>sampleRate</code>. Will throw an IllegalArgumentException if <code>timeSize</code> is not even.
<P>
<DL>
<DT><B>Parameters:</B><DD><CODE>timeSize</CODE> - the length of the audio buffers you plan to analyze<DD><CODE>sampleRate</CODE> - the sample rate of the audio samples you plan to analyze</DL>
</DL>



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<A NAME="allocateArrays()"></A><H3>
allocateArrays</H3>
<PRE>
protected void <B>allocateArrays</B>()</PRE>
<DL>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#allocateArrays()">allocateArrays</A></CODE> in class <CODE><A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html" title="class in com.badlogic.gdx.audio.analysis">FourierTransform</A></CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="scaleBand(int, float)"></A><H3>
scaleBand</H3>
<PRE>
public void <B>scaleBand</B>(int i,
float s)</PRE>
<DL>
<DD>Not currently implemented.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#scaleBand(int, float)">scaleBand</A></CODE> in class <CODE><A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html" title="class in com.badlogic.gdx.audio.analysis">FourierTransform</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>i</CODE> - the frequency band to modify<DD><CODE>s</CODE> - the scaling factor</DL>
</DD>
</DL>
<HR>

<A NAME="setBand(int, float)"></A><H3>
setBand</H3>
<PRE>
public void <B>setBand</B>(int i,
float a)</PRE>
<DL>
<DD>Not currently implemented.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#setBand(int, float)">setBand</A></CODE> in class <CODE><A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html" title="class in com.badlogic.gdx.audio.analysis">FourierTransform</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>i</CODE> - the frequency band to modify<DD><CODE>a</CODE> - the new amplitude</DL>
</DD>
</DL>
<HR>

<A NAME="forward(float[])"></A><H3>
forward</H3>
<PRE>
public void <B>forward</B>(float[] samples)</PRE>
<DL>
<DD><B>Description copied from class: <CODE><A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#forward(float[])">FourierTransform</A></CODE></B></DD>
<DD>Performs a forward transform on <code>buffer</code>.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#forward(float[])">forward</A></CODE> in class <CODE><A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html" title="class in com.badlogic.gdx.audio.analysis">FourierTransform</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>samples</CODE> - the buffer to analyze</DL>
</DD>
</DL>
<HR>

<A NAME="inverse(float[])"></A><H3>
inverse</H3>
<PRE>
public void <B>inverse</B>(float[] buffer)</PRE>
<DL>
<DD><B>Description copied from class: <CODE><A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#inverse(float[])">FourierTransform</A></CODE></B></DD>
<DD>Performs an inverse transform of the frequency spectrum and places the result in <code>buffer</code>.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#inverse(float[])">inverse</A></CODE> in class <CODE><A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html" title="class in com.badlogic.gdx.audio.analysis">FourierTransform</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>buffer</CODE> - the buffer to place the result of the inverse transform in</DL>
</DD>
</DL>

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