@thi.ng/dsp/osc.js

Composable signal generators, oscillators, filters, FFT, spectrum, windowing & related DSP utils

import { isNumber } from "@thi.ng/checks/is-number";
import { Add, add } from "./add.js";
import { AGen } from "./agen.js";
import { Const } from "./const.js";
import { sum } from "./sum.js";
const osc = (osc2, freq, amp, dc, phase) => new Osc(osc2, freq, amp, dc, phase);
const modOsc = (osc2, freq, fmod, amod = 1, dc, phase) => new Osc(
  osc2,
  sum(
    isNumber(fmod) ? new Const(fmod) : fmod,
    isNumber(freq) ? add(freq) : freq
  ),
  amod,
  dc,
  phase
);
class Osc extends AGen {
  constructor(_osc, freq, amp = 1, _dc = 0, phase = 0) {
    super(0);
    this._osc = _osc;
    this._dc = _dc;
    isNumber(freq) ? this.setFreq(freq, phase) : this.setFreq(freq);
    this.setAmp(amp);
  }
  _phase;
  _amp;
  next() {
    return this._val = this._osc(
      this._phase.next(),
      1,
      this._amp.next(),
      this._dc
    );
  }
  setFreq(freq, phase) {
    this._phase = isNumber(freq) ? new Add(freq, phase || 0) : freq;
  }
  setAmp(amp) {
    this._amp = isNumber(amp) ? new Const(amp) : amp;
  }
}
export {
  Osc,
  modOsc,
  osc
};