# Minimでノコギリ波，矩形波，ホワイトノイズを合成する

```/**
* Synthesis of Saw Wave, Square Wave, White Noise
*
* @author aa_debdeb
* @date 2015/12/19
*/

import ddf.minim.*;
import ddf.minim.analysis.*;
import ddf.minim.effects.*;
import ddf.minim.signals.*;
import ddf.minim.spi.*;
import ddf.minim.ugens.*;

Minim minim;
AudioOutput out;
Summer summer;

void setup(){
size(512, 200);
minim = new Minim(this);
out = minim.getLineOut();

summer = getSawWave(440, 0.5, 50);
summer.patch(out);

}

void draw(){
background(0);
stroke(255);
strokeWeight(1);
for(int i = 0; i < out.bufferSize() - 1; i++){
line(i, 50 + out.left.get(i) * 50, i + 1, 50 + out.left.get(i + 1) * 50);
line(i, 150 + out.right.get(i) * 50, i + 1, 150 + out.right.get(i + 1) * 50);
}
}

void keyPressed(){
switch(key){
case '1':
summer.unpatch(out);
summer = getSawWave(440, 0.5, 50);
summer.patch(out);
break;
case '2':
summer.unpatch(out);
summer = getSquareWave(440, 0.5, 50);
summer.patch(out);
break;
case '3':
summer.unpatch(out);
summer = getWhiteNoise(0.5, 50);
summer.patch(out);
break;
}
}

Summer getSawWave(float freq, float amp, int n){
Summer summer = new Summer();
for(int i = 0; i < n; i++){
Oscil wave = new Oscil(freq * i, amp / (i + 1), Waves.SINE);
wave.patch(summer);
}
return summer;
}

Summer getSquareWave(float freq, float amp, int n){
Summer summer = new Summer();
for(int i = 0; i < n; i++){
Oscil wave = new Oscil(freq * (i * 2 + 1), amp / (i * 2 + 1), Waves.SINE);
wave.patch(summer);
}
return summer;
}

Summer getWhiteNoise(float amp, int n){
Summer summer = new Summer();
for(int i = 0; i < n; i++){
Oscil wave = new Oscil(random(20000), amp * 0.1, Waves.SINE);
wave.patch(summer);
}
return summer;
}
```