/// <reference types="node" />
import { Transform, TransformCallback } from 'stream';
import { SpectralBuffer } from '../SpectralBuffer';
import { Smp } from '../global';
/**
 * Inverse fast fourier transform stream. Convert SpectralBuffer object stream to overlapping AudioBuffer stream.
 */
declare class IFFT extends Transform {
    windowSize: Smp;
    frameSize: Smp;
    fftFunction: any;
    constructor(windowSize?: number);
    _transform(spectrum: SpectralBuffer, encoding: string, callback: TransformCallback): void;
}
export { IFFT };