<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <link rel="stylesheet" href="style.css" type="text/css"> <meta content="text/html; charset=iso-8859-1" http-equiv="Content-Type"> <link rel="Start" href="index.html"> <link rel="Up" href="Audio.Mono.Analyze.html"> <link title="Index of types" rel=Appendix href="index_types.html"> <link title="Index of exceptions" rel=Appendix href="index_exceptions.html"> <link title="Index of values" rel=Appendix href="index_values.html"> <link title="Index of class methods" rel=Appendix href="index_methods.html"> <link title="Index of classes" rel=Appendix href="index_classes.html"> <link title="Index of class types" rel=Appendix href="index_class_types.html"> <link title="Index of modules" rel=Appendix href="index_modules.html"> <link title="Index of module types" rel=Appendix href="index_module_types.html"> <link title="Audio" rel="Chapter" href="Audio.html"> <link title="Image" rel="Chapter" href="Image.html"> <link title="MIDI" rel="Chapter" href="MIDI.html"> <link title="Ringbuffer" rel="Chapter" href="Ringbuffer.html"> <link title="Synth" rel="Chapter" href="Synth.html"> <link title="Video" rel="Chapter" href="Video.html"><title>Audio.Mono.Analyze.FFT</title> </head> <body> <div class="navbar"> <a class="up" href="Audio.Mono.Analyze.html" title="Audio.Mono.Analyze">Up</a> </div> <h1>Module <a href="type_Audio.Mono.Analyze.FFT.html">Audio.Mono.Analyze.FFT</a></h1> <pre><span class="keyword">module</span> FFT: <code class="code">sig</code> <a href="Audio.Mono.Analyze.FFT.html">..</a> <code class="code">end</code></pre><div class="info module top"> Simple implementation of the FFT algorithm. For fastest implementations optimized libraries such as fftw are recommended.<br> </div> <hr width="100%"> <pre><span id="TYPEt"><span class="keyword">type</span> <code class="type"></code>t</span> </pre> <div class="info "> Internal data for computing FFT.<br> </div> <pre><span id="VALinit"><span class="keyword">val</span> init</span> : <code class="type">int -> <a href="Audio.Mono.Analyze.FFT.html#TYPEt">t</a></code></pre><div class="info "> Initialize FFT for an analysis of <code class="code">2^n</code> samples.<br> </div> <pre><span id="VALduration"><span class="keyword">val</span> duration</span> : <code class="type"><a href="Audio.Mono.Analyze.FFT.html#TYPEt">t</a> -> int</code></pre><div class="info "> Duration of the FFT buffer analysis in samples.<br> </div> <pre><span id="VALcomplex_create"><span class="keyword">val</span> complex_create</span> : <code class="type"><a href="Audio.Mono.html#TYPEbuffer">Audio.Mono.buffer</a> -> int -> int -> Complex.t array</code></pre><div class="info "> <code class="code">complex_create buf ofs len</code> create a array of complex numbers of size <code class="code">len</code> by copying data from <code class="code">buf</code> from ofset <code class="code">ofs</code> (the imaginary part is null).<br> </div> <pre><span id="VALfft"><span class="keyword">val</span> fft</span> : <code class="type"><a href="Audio.Mono.Analyze.FFT.html#TYPEt">t</a> -> Complex.t array -> unit</code></pre><div class="info "> Perform an FFT analysis.<br> </div> <pre><span id="VALband_freq"><span class="keyword">val</span> band_freq</span> : <code class="type">int -> <a href="Audio.Mono.Analyze.FFT.html#TYPEt">t</a> -> int -> float</code></pre><div class="info "> Frequency associated to the <code class="code">k</code>-th coefficient of an FFT.<br> </div> <pre><span class="keyword">module</span> <a href="Audio.Mono.Analyze.FFT.Window.html">Window</a>: <code class="code">sig</code> <a href="Audio.Mono.Analyze.FFT.Window.html">..</a> <code class="code">end</code></pre><div class="info"> Windowing functions. </div> <pre><span id="VALnotes"><span class="keyword">val</span> notes</span> : <code class="type">int -><br> <a href="Audio.Mono.Analyze.FFT.html#TYPEt">t</a> -><br> ?window:(Complex.t array -> unit) -><br> ?note_min:int -><br> ?note_max:int -><br> ?volume_min:float -><br> ?filter_harmonics:bool -><br> float array -> int -> int -> (<a href="Audio.Note.html#TYPEt">Audio.Note.t</a> * float) list</code></pre> <pre><span id="VALloudest_note"><span class="keyword">val</span> loudest_note</span> : <code class="type">(<a href="Audio.Note.html#TYPEt">Audio.Note.t</a> * float) list -> (<a href="Audio.Note.html#TYPEt">Audio.Note.t</a> * float) option</code></pre></body></html>
