/** Calculates the A-weight values for the specified frequency/frequencies
 * @function A
 * @param {number|number[]} f frequency/frequencies
 */
declare function A(f: number | number[]): void;

/** Calculates the B-weight values for the specified frequency/frequencies
 * @function B
 * @param {number|number[]} f frequency/frequencies
 */
declare function B(f: number | number[]): void;

/** Class for converting weighted measurements
 */
declare class WeightConverter {
    constructor();
}