Convolution Reverb

The p5.Convolver can recreate the sound of actual spaces using convolution. Convolution takes an Impulse Response, (the sound of a room reverberating), and uses that to recreate the sound of that space.

Click to play a sound through convolution. Every time you click, the sound is convolved with a different Impulse Response. To hear the Impulse Response itself, press any key.

To run this example locally, you will need the p5.sound library a sound file, and a running local server. These convolution samples are Creative Commons BY recordinghopkins

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
let sound, env, cVerb, fft;
let currentIR = 0;
let rawImpulse;
function preload() {
  // we have included both MP3 and OGG versions of all the impulses/sounds
  soundFormats('ogg', 'mp3');
  // create a p5.Convolver
  cVerb = createConvolver('assets/bx-spring');
  // add Impulse Responses to cVerb.impulses array, in addition to bx-spring
  cVerb.addImpulse('assets/small-plate');
  cVerb.addImpulse('assets/drum');
  cVerb.addImpulse('assets/beatbox');
  cVerb.addImpulse('assets/concrete-tunnel');
  // load a sound that will be processed by the p5.ConvultionReverb
  sound = loadSound('assets/Damscray_DancingTiger');
}
function setup() {
  createCanvas(710, 400);
  rawImpulse = loadSound('assets/' + cVerb.impulses[currentIR].name);
  // disconnect from master output...
  sound.disconnect();
  // ... and process with cVerb
  // so that we only hear the reverb
  cVerb.process(sound);
  fft = new p5.FFT();
}
function draw() {
  background(30);
  fill(0, 255, 40);
  let spectrum = fft.analyze();
  // Draw every value in the frequencySpectrum array as a rectangle
  noStroke();
  for (let i = 0; i < spectrum.length; i++) {
    let x = map(i, 0, spectrum.length, 0, width);
    let h = -height + map(spectrum[i], 0, 255, height, 0);
    rect(x, height, width / spectrum.length, h);
  }
}
function mousePressed() {
  // cycle through the array of cVerb.impulses
  currentIR++;
  if (currentIR >= cVerb.impulses.length) {
    currentIR = 0;
  }
  cVerb.toggleImpulse(currentIR);
  // play the sound through the impulse
  sound.play();
  // display the current Impulse Response name (the filepath)
  println('Convolution Impulse Response: ' + cVerb.impulses[currentIR].name);
  rawImpulse.setPath('assets/' + cVerb.impulses[currentIR].name);
}
// play the impulse (without convolution)
function keyPressed() {
  rawImpulse.play();
}
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Language Settings

Convolution Reverb