initial

index.js

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+
+/**
+ * @module osc
+ * @author stagas
+ * @org opendsp
+ * @desc oscillators
+ * @license mit
+ */
+
+var tau = 2 * Math.PI;
+
+export function sin(t, f){
+  return Math.sin(f * t * tau);
+}
+
+export function saw(t, f){
+  return 1 - 2 * (t % (1 / f)) * f;
+}
+
+export function ramp(t, f){
+  return 2 * (t % (1 / f)) * f - 1;
+}
+
+export function tri(t, f){
+  return Math.abs(1 - (2 * t * f) % 2) * 2 - 1;
+}
+
+export function sqr(t, f){
+  return (t*f % 1/f < 1/f/2) * 2 - 1;
+}
+
+export function noise(){
+  return Math.random() * 2 - 1;
+}

test.js

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+
+/**
+ * test
+ */
+
+import { sin, saw, ramp, tri, sqr, noise } from './index';
+
+export function dsp(t){
+  //return (sqr(t, .1) + sin(t, .1)) / 3;
+  return [sin, saw, ramp, tri, sqr, noise][2*t%6|0](t, 300) * 0.4;
+}