import { NormalRange, PowerOfTwo } from "../../core/type/Units";
import { MeterBase, MeterBaseOptions } from "./MeterBase";
export interface FFTOptions extends MeterBaseOptions {
    size: PowerOfTwo;
    smoothing: NormalRange;
    normalRange: boolean;
}
/**
 * Get the current frequency data of the connected audio source using a fast Fourier transform.
 * @category Component
 */
export declare class FFT extends MeterBase<FFTOptions> {
    readonly name: string;
    /**
     * If the output should be in decibels or normal range between 0-1. If `normalRange` is false,
     * the output range will be the measured decibel value, otherwise the decibel value will be converted to
     * the range of 0-1
     */
    normalRange: boolean;
    /**
     * @param size The size of the FFT. Value must be a power of two in the range 16 to 16384.
     */
    constructor(size?: PowerOfTwo);
    constructor(options?: Partial<FFTOptions>);
    static getDefaults(): FFTOptions;
    /**
     * Gets the current frequency data from the connected audio source.
     * Returns the frequency data of length [[size]] as a Float32Array of decibel values.
     */
    getValue(): Float32Array;
    /**
     * The size of analysis. This must be a power of two in the range 16 to 16384.
     * Determines the size of the array returned by [[getValue]] (i.e. the number of
     * frequency bins). Large FFT sizes may be costly to compute.
     */
    size: PowerOfTwo;
    /**
     * 0 represents no time averaging with the last analysis frame.
     */
    smoothing: NormalRange;
}