prensf2010:normalize
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prensf2010:normalize [2010/07/05 10:17] nels_oscar created |
prensf2010:normalize [2010/07/05 10:22] nels_oscar |
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| - | <code java> | + | ^Ess ^Minim ^ |
| + | |<code java> // Example by Krister Olsson | ||
| + | // Modified by spc | ||
| + | |||
| + | import krister.Ess.*; | ||
| + | |||
| + | AudioChannel myChannel; | ||
| + | |||
| + | void setup() { | ||
| + | size(256,200); | ||
| + | background(0, 0, 255); | ||
| + | |||
| + | // start up Ess | ||
| + | Ess.start(this); | ||
| + | |||
| + | // load "cell.aif" into a new AudioChannel | ||
| + | myChannel=new AudioChannel("bassoon-g4.wav"); | ||
| + | normalize(myChannel); | ||
| + | |||
| + | /* draw every 200th sample | ||
| + | for (int i=0;i<256;i++) { | ||
| + | set(i,(int)(100+myChannel.samples[i*200]*100),255); | ||
| + | }*/ | ||
| + | |||
| + | // draw each sample (as many as the window can hold) | ||
| + | for (int i=0;i<myChannel.size;i++) { | ||
| + | set(i,(int)(100+myChannel.samples[i]*100),0); | ||
| + | } | ||
| + | |||
| + | // start the sound looping forever | ||
| + | myChannel.play(); | ||
| + | myChannel.saveSound("modified.wav"); | ||
| + | } | ||
| + | |||
| + | float maxSample(AudioChannel chan) { | ||
| + | float largest = 0; | ||
| + | for (int i = 0; i < chan.size; i++) { | ||
| + | if (largest < chan.samples[i]) | ||
| + | largest = chan.samples[i]; | ||
| + | } | ||
| + | return largest; | ||
| + | } | ||
| + | |||
| + | void normalize(AudioChannel chan) { | ||
| + | float largest; | ||
| + | |||
| + | // find the value of the largest amplitude | ||
| + | largest = maxSample(chan); | ||
| + | println(largest); | ||
| + | |||
| + | // compute a multiplier, assuming max positive == max negative | ||
| + | float mult = 1.0 / largest; | ||
| + | |||
| + | // apply the multiplier to every sample | ||
| + | for (int i = 0; i < chan.size; i++) { | ||
| + | chan.samples[i] *= mult; | ||
| + | } | ||
| + | } | ||
| + | |||
| + | void draw() { | ||
| + | } | ||
| + | |||
| + | // we are done, clean up Ess | ||
| + | |||
| + | public void stop() { | ||
| + | Ess.stop(); | ||
| + | super.stop(); | ||
| + | }</code>|<code java> | ||
| // Nels Oscar | // Nels Oscar | ||
| // Simple normalization using Minims AudioEffecs interface | // Simple normalization using Minims AudioEffecs interface | ||
| Line 9: | Line 76: | ||
| AudioSample sample; | AudioSample sample; | ||
| - | |||
| - | AudioSignal modified; | ||
| - | |||
| - | AudioOutput out; | ||
| void setup(){ | void setup(){ | ||
| Line 18: | Line 81: | ||
| background(0); | background(0); | ||
| minim=new Minim(this); | minim=new Minim(this); | ||
| - | out=minim.getLineOut(); | + | sample=minim.loadSample("c4.wav",4096); |
| - | sample=minim.loadSample("c4.wav",1024); | + | |
| sample.addEffect(new Nermalize()); | sample.addEffect(new Nermalize()); | ||
| } | } | ||
| Line 52: | Line 114: | ||
| hiSample=abs(sig[j]); | hiSample=abs(sig[j]); | ||
| } | } | ||
| - | float diff=1.+hiSample; | + | float diff=1./hiSample; |
| for(int i=0; i<sig.length; i++){ | for(int i=0; i<sig.length; i++){ | ||
| sig[i]*=diff; | sig[i]*=diff; | ||
| Line 63: | Line 125: | ||
| | | ||
| } | } | ||
| - | </code> | + | </code>| |
prensf2010/normalize.txt · Last modified: 2010/07/05 10:22 by nels_oscar
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