I'm working on a 3D web app where I want to use positional 3D audio.
I started noticing that a crackling noise appears on the output as the sound source changes its position. Initially I thought it could be a programming issue or a library issue (I was using howler.js).
I made a very basic example based on plain JS and Webaudio API which is shown here
let params={
"xPosition":0,
"zPosition":-1
};
let gui=new dat.GUI( { autoPlace: true, width: 500 });
const AudioContext = window.AudioContext || window.webkitAudioContext;
let audioCtx;
let panner;
let listener;
let source;
let osc;
function initWebAudio(){
audioCtx = new AudioContext();
panner = audioCtx.createPanner();
listener = audioCtx.listener;
osc = audioCtx.createOscillator();
osc.frequency.value = 70;
osc.connect(panner);
osc.start(0);
panner.connect(audioCtx.destination);
panner.panningModel = 'HRTF';
panner.distanceModel = 'linear';
panner.maxDistance = 60;
panner.refDistance = 1;
panner.rolloffFactor = 1;
panner.coneInnerAngle = 360;
panner.coneOuterAngle = 360;
panner.coneOuterGain = 0;
panner.positionX.setValueAtTime(0,audioCtx.currentTime);
panner.positionY.setValueAtTime(1,audioCtx.currentTime);
panner.positionZ.setValueAtTime(1,audioCtx.currentTime);
if(panner.orientationX) {
panner.orientationX.value = 1;
panner.orientationY.value = 0;
panner.orientationZ.value = 0;
} else {
panner.setOrientation(1,0,0);
}
if(listener.forwardX) {
listener.forwardX.value = 0;
listener.forwardY.value = 0;
listener.forwardZ.value = -1;
listener.upX.value = 0;
listener.upY.value = 1;
listener.upZ.value = 0;
} else {
listener.setOrientation(0,0,-1,0,1,0);
}
if(listener.positionX) {
listener.positionX.value = 0;
listener.positionY.value = 0;
listener.positionZ.value = 0;
} else {
listener.setPosition(0,0,0);
}
}
function positionPanner() {
if(panner.positionX) {
panner.positionX.setValueAtTime(params.xPosition, audioCtx.currentTime);
} else {
panner.setPosition(params.xPosition,0,params.zPosition);
}
}
function tick(){
positionPanner();
}
function onClickStart(){
initWebAudio();
gui.add(osc.frequency,"value",50,220).name("frequency");
setInterval(tick,50);
}
function buildMenu(){
gui.add(params,"xPosition",-3,3).step(0.001);
gui.add(window,"onClickStart").name("start");
}
buildMenu();
https://jsfiddle.net/fedeM75/t9vpm8so/23/
Press start, then as you change the xPosition slider a crackling sound appears. It is specially noticeable using headphones.
I searched on google and some people say that it has to do with the rate of change of the position. But I tried with different value ranges and it still happens with small changes.
By the way if the condition to use the panner is to have a very slow rate of change in the position it does not seem to be useful in real world cases.
I use a timer to update the position but the same happens using requestAnimationFrame()
Does anyone has a clue on why this happens and how to solve it?
from Webaudio panner crackling sound when position is changed
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