Minim |
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NONE |
Description A constant indicating no window should be used on sample buffers. Also referred as a Rectangular window.Signature WindowFunction NONE Related Rectangular windowWindowFunction Example /** * This sketch demonstrates how to use an FFT to analyze an * AudioBuffer and draw the resulting spectrum. <br /> * It also allows you to turn windowing on and off, * but you will see there is not much difference in the spectrum.<br /> * Use the number keys to choose different windows. * <p> * For more information about Minim and additional features, * visit http://code.compartmental.net/minim/ */ import ddf.minim.analysis.*; import ddf.minim.*; Minim minim; AudioPlayer jingle; FFT fft; String windowName; void setup() { size(512, 200, P3D); minim = new Minim(this); jingle = minim.loadFile("jingle.mp3", 2048); jingle.loop(); // create an FFT object that has a time-domain buffer // the same size as jingle's sample buffer // note that this needs to be a power of two // and that it means the size of the spectrum // will be 512. see the online tutorial for more info. fft = new FFT(jingle.bufferSize(), jingle.sampleRate()); textFont(createFont("Arial", 16)); windowName = "Rectangular Window"; } void draw() { background(0); stroke(255); // perform a forward FFT on the samples in jingle's left buffer // note that if jingle were a MONO file, // this would be the same as using jingle.right or jingle.left fft.forward(jingle.mix); for(int i = 0; i < fft.specSize(); i++) { // convert the magnitude to a DB value. // this means values will range roughly from 0 for the loudest // bands to some negative value. float bandDB = 20 * log( 2 * fft.getBand(i) / fft.timeSize() ); // so then we want to map our DB value to the height of the window // given some reasonable range float bandHeight = map( bandDB, 0, -150, 0, height ); line(i, height, i, bandHeight ); } fill(255); // keep us informed about the window being used text("The window being used is: " + windowName, 5, 20); } void keyReleased() { WindowFunction newWindow = FFT.NONE; if ( key == '1' ) { newWindow = FFT.BARTLETT; } else if ( key == '2' ) { newWindow = FFT.BARTLETTHANN; } else if ( key == '3' ) { newWindow = FFT.BLACKMAN; } else if ( key == '4' ) { newWindow = FFT.COSINE; } else if ( key == '5' ) { newWindow = FFT.GAUSS; } else if ( key == '6' ) { newWindow = FFT.HAMMING; } else if ( key == '7' ) { newWindow = FFT.HANN; } else if ( key == '8' ) { newWindow = FFT.LANCZOS; } else if ( key == '9' ) { newWindow = FFT.TRIANGULAR; } fft.window( newWindow ); windowName = newWindow.toString(); } Usage Web & Application |