@thi.ng/dsp/pink-noise.d.ts

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

import type { IReset, Tuple } from "@thi.ng/api";
import type { IRandom } from "@thi.ng/random";
import { AGen } from "./agen.js";
export type PNoiseCoeffs = Tuple<number, 5>;
/**
 * Pink noise generator with customizable frequency distribution. The
 * default config produces a power spectrum roughly following the `1/f`
 * pink characteristic.
 *
 * @remarks
 * Custom frequency/power distributions can be obtained by providing
 * `amp` and `prob`ability tuples for the 5 internal bins used to
 * compute the noise. `amp` defines per-bin power contributions, the
 * latter bin update probabilities.
 *
 * Resulting noise values are normalized to given `gain`, which itself
 * is scale relative to the sum of given `amp` values.
 *
 * References:
 *
 * - http://web.archive.org/web/20160513114217/http://home.earthlink.net/~ltrammell/tech/newpink.htm
 * - http://web.archive.org/web/20160515145318if_/http://home.earthlink.net/~ltrammell/tech/pinkalg.htm
 * - https://www.musicdsp.org/en/latest/Synthesis/220-trammell-pink-noise-c-class.html
 *
 * @param gain -
 * @param rnd -
 * @param amp -
 * @param prob -
 */
export declare const pinkNoise: (gain?: number, rnd?: IRandom, amp?: PNoiseCoeffs, prob?: PNoiseCoeffs) => PinkNoise;
export declare class PinkNoise extends AGen<number> implements IReset {
    protected _gain: number;
    protected _rnd: IRandom;
    protected _amp: PNoiseCoeffs;
    protected _bins: number[];
    protected _psum: number[];
    constructor(_gain?: number, _rnd?: IRandom, _amp?: PNoiseCoeffs, prob?: PNoiseCoeffs);
    reset(): this;
    next(): number;
}
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