Hello,
I work on a machine whose movement is actualized with certain frequencies of a music.
You can see an exemple here:
I started with the beat detect example from the minim library. But the detection is not very precise, I would like to have a program where we see the frequencies of the music, then another program, where we can detect a set of 10 frequencies for example between 50 and 150 hz, 150 and 250 hz …, 14,000 Hz to 16000 Hz. Is it possible?
I put the exemple of minim library
/**
* with successive buffers of audio. You can do this inside of <code>draw</code>, but you are likely to miss some
* audio buffers if you do this. The sketch implements an <code>AudioListener</code> called <code>BeatListener</code>
* so that it can call <code>detect</code> on every buffer of audio processed by the system without repeating a buffer
* or missing one.
* <p>
* This sketch plays an entire song so it may be a little slow to load.
* <p>
* For more information about Minim and additional features,
* visit http://code.compartmental.net/minim/
*/
import ddf.minim.*;
import ddf.minim.analysis.*;
Minim minim;
AudioPlayer song;
BeatDetect beat;
BeatListener bl;
float kickSize, snareSize, hatSize;
class BeatListener implements AudioListener
{
private BeatDetect beat;
private AudioPlayer source;
BeatListener(BeatDetect beat, AudioPlayer source)
{
this.source = source;
this.source.addListener(this);
this.beat = beat;
}
void samples(float[] samps)
{
beat.detect(source.mix);
}
void samples(float[] sampsL, float[] sampsR)
{
beat.detect(source.mix);
}
}
void setup()
{
size(512, 200, P3D);
minim = new Minim(this);
song = minim.loadFile("marcus_kellis_theme.mp3", 1024);
song.play();
// a beat detection object that is FREQ_ENERGY mode that
// expects buffers the length of song's buffer size
// and samples captured at songs's sample rate
beat = new BeatDetect(song.bufferSize(), song.sampleRate());
// set the sensitivity to 300 milliseconds
// After a beat has been detected, the algorithm will wait for 300 milliseconds
// before allowing another beat to be reported. You can use this to dampen the
// algorithm if it is giving too many false-positives. The default value is 10,
// which is essentially no damping. If you try to set the sensitivity to a negative value,
// an error will be reported and it will be set to 10 instead.
// note that what sensitivity you choose will depend a lot on what kind of audio
// you are analyzing. in this example, we use the same BeatDetect object for
// detecting kick, snare, and hat, but that this sensitivity is not especially great
// for detecting snare reliably (though it's also possible that the range of frequencies
// used by the isSnare method are not appropriate for the song).
beat.setSensitivity(300);
kickSize = snareSize = hatSize = 16;
// make a new beat listener, so that we won't miss any buffers for the analysis
bl = new BeatListener(beat, song);
textFont(createFont("Helvetica", 16));
textAlign(CENTER);
}
void draw()
{
background(0);
// draw a green rectangle for every detect band
// that had an onset this frame
float rectW = width / beat.detectSize();
for(int i = 0; i < beat.detectSize(); ++i)
{
// test one frequency band for an onset
if ( beat.isOnset(i) )
{
fill(0,200,0);
rect( i*rectW, 0, rectW, height);
}
}
// draw an orange rectangle over the bands in
// the range we are querying
int lowBand = 5;
int highBand = 15;
// at least this many bands must have an onset
// for isRange to return true
int numberOfOnsetsThreshold = 4;
if ( beat.isRange(lowBand, highBand, numberOfOnsetsThreshold) )
{
fill(232,179,2,200);
rect(rectW*lowBand, 0, (highBand-lowBand)*rectW, height);
}
if ( beat.isKick() ) kickSize = 32;
if ( beat.isSnare() ) snareSize = 32;
if ( beat.isHat() ) hatSize = 32;
fill(255);
textSize(kickSize);
text("KICK", width/4, height/2);
textSize(snareSize);
text("SNARE", width/2, height/2);
textSize(hatSize);
text("HAT", 3*width/4, height/2);
kickSize = constrain(kickSize * 0.95, 16, 32);
snareSize = constrain(snareSize * 0.95, 16, 32);
hatSize = constrain(hatSize * 0.95, 16, 32);
}
