@thi.ng/dsp/sincos.js

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

import { TAU } from "@thi.ng/math/api";
import { AGen } from "./agen.js";
class SinCos extends AGen {
  constructor(_freq, _amp = 1) {
    super([0, _amp]);
    this._freq = _freq;
    this._amp = _amp;
    this.calcCoeffs();
  }
  _f;
  _s;
  _c;
  copy() {
    return new SinCos(this._freq, this._amp);
  }
  reset() {
    this.calcCoeffs();
    return this;
  }
  next() {
    this._val = [this._s, this._c];
    this._s += this._f * this._c;
    this._c -= this._f * this._s;
    return this._val;
  }
  freq() {
    return this._freq;
  }
  setFreq(freq) {
    this._freq = freq;
    this.calcCoeffs();
  }
  amp() {
    return this._amp;
  }
  setAmp(amp) {
    this._amp = amp;
    this.calcCoeffs();
  }
  calcCoeffs() {
    this._f = TAU * this._freq;
    this._s = 0;
    this._c = this._amp;
  }
}
export {
  SinCos
};