import type { FnU3, NumericArray } from "@thi.ng/api";
import type { FilterConfig, FilterResponse } from "./api.js";
/**
 * Returns filter response for given filter coefficients at normalized
 * frequency `f`. If `db` is true (default), the magnitude in the
 * returned object will be in dBFS.
 *
 * References:
 *
 * - https://www.earlevel.com/main/2016/12/01/evaluating-filter-frequency-response/
 * - https://www.earlevel.com/main/2016/12/08/filter-frequency-response-grapher/
 * - https://github.com/mohayonao/freqr
 *
 * @param zeroes -
 * @param poles -
 * @param freq -
 * @param db -
 */
export declare const filterResponseRaw: (zeroes: NumericArray, poles: NumericArray, freq: number, db?: boolean) => FilterResponse;
export declare const filterResponse: (coeffs: FilterConfig, freq: number, db?: boolean) => FilterResponse;
export declare const freqRange: FnU3<number, number[]>;
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