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FFT (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 FFT</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.FFT</B>
</PRE>
<HR>
<DL>
<DT><PRE>public class <B>FFT</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>
FFT stands for Fast Fourier Transform. It is an efficient way to calculate the Complex Discrete Fourier Transform. There is not
much to say about this class other than the fact that when you want to analyze the spectrum of an audio buffer you will almost
always use this class. One restriction of this class is that the audio buffers you want to analyze must have a length that is a
power of two. If you try to construct an FFT with a <code>timeSize</code> that is not a power of two, an
IllegalArgumentException will be thrown.
<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="http://www.dspguide.com/ch12.htm">The Fast Fourier Transform</a></DL>
<HR>

<P>


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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/FFT.html#FFT(int, float)">FFT</A></B>(int timeSize,
float sampleRate)</CODE>

<BR>
          Constructs an FFT that will accept sample buffers that are <code>timeSize</code> long and 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/FFT.html#allocateArrays()">allocateArrays</A></B>()</CODE>

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           </TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../com/badlogic/gdx/audio/analysis/FFT.html#forward(float[])">forward</A></B>(float[] buffer)</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/FFT.html#forward(float[], float[])">forward</A></B>(float[] buffReal,
float[] buffImag)</CODE>

<BR>
          Performs a forward transform on the passed buffers.</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/FFT.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/FFT.html#scaleBand(int, float)">scaleBand</A></B>(int i,
float s)</CODE>

<BR>
          Scales the amplitude of the <code>i<sup>th</sup></code> frequency band by <code>s</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/FFT.html#setBand(int, float)">setBand</A></B>(int i,
float a)</CODE>

<BR>
          Sets the amplitude of the <code>i<sup>th</sup></code> frequency band to <code>a</code>.</TD>
</TR>
</TABLE>
 <A NAME="methods_inherited_from_class_com.badlogic.gdx.audio.analysis.FourierTransform"></A>
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<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>
</TR>
<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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<A NAME="FFT(int, float)"></A><H3>
FFT</H3>
<PRE>
public <B>FFT</B>(int timeSize,
float sampleRate)</PRE>
<DL>
<DD>Constructs an FFT that will accept sample buffers that are <code>timeSize</code> long and have been recorded with a sample
rate of <code>sampleRate</code>. <code>timeSize</code> <em>must</em> be a power of two. This will throw an exception if it
is not.
<P>
<DL>
<DT><B>Parameters:</B><DD><CODE>timeSize</CODE> - the length of the sample buffers you will be analyzing<DD><CODE>sampleRate</CODE> - the sample rate of the audio you will be analyzing</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><B>Description copied from class: <CODE><A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#scaleBand(int, float)">FourierTransform</A></CODE></B></DD>
<DD>Scales the amplitude of the <code>i<sup>th</sup></code> frequency band by <code>s</code>. You can use this to shape the
spectrum before using <code>inverse()</code>.
<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><B>Description copied from class: <CODE><A HREF="../../../../../com/badlogic/gdx/audio/analysis/FourierTransform.html#setBand(int, float)">FourierTransform</A></CODE></B></DD>
<DD>Sets the amplitude of the <code>i<sup>th</sup></code> frequency band to <code>a</code>. You can use this to shape the
spectrum before using <code>inverse()</code>.
<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[] buffer)</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>buffer</CODE> - the buffer to analyze</DL>
</DD>
</DL>
<HR>

<A NAME="forward(float[], float[])"></A><H3>
forward</H3>
<PRE>
public void <B>forward</B>(float[] buffReal,
float[] buffImag)</PRE>
<DL>
<DD>Performs a forward transform on the passed buffers.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>buffReal</CODE> - the real part of the time domain signal to transform<DD><CODE>buffImag</CODE> - the imaginary part of the time domain signal to transform</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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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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