网络音频API WaveShaperNode
答
请随时查看示例here。
详细地,创建一个波形成形曲线与此功能:
WAAMorningStar.prototype.createWSCurve = function (amount, n_samples) {
if ((amount >= 0) && (amount < 1)) {
ND.dist = amount;
var k = 2 * ND.dist/(1 - ND.dist);
for (var i = 0; i < n_samples; i+=1) {
// LINEAR INTERPOLATION: x := (c - a) * (z - y)/(b - a) + y
// a = 0, b = 2048, z = 1, y = -1, c = i
var x = (i - 0) * (1 - (-1))/(n_samples - 0) + (-1);
this.wsCurve[i] = (1 + k) * x/(1+ k * Math.abs(x));
}
}
然后,它在这样的波形成形器节点“负载”:
this.createWSCurve(ND.dist, this.nSamples);
this.sigmaDistortNode = this.context.createWaveShaper();
this.sigmaDistortNode.curve = this.wsCurve;
每次我需要改变失真参数,我重新创建波形曲线:
WAAMorningStar.prototype.setDistortion = function (distValue) {
var distCorrect = distValue;
if (distValue < -1) {
distCorrect = -1;
}
if (distValue >= 1) {
distCorrect = 0.985;
}
this.createWSCurve (distCorrect, this.nSamples);
}
(我使用distCorrect使dist比例声音更好,价值发现euristically)。 您可以找到我用来创建波形曲线的算法here