import { MelSpectrogramConfig, AudioSegment } from '../core/types';
export declare class AudioPreprocessor {
    private config;
    private melFilterBank;
    private fftProcessor;
    constructor(config?: Partial<MelSpectrogramConfig>);
    private initializeMelFilterBank;
    private hzToMel;
    private melToHz;
    preEmphasis(signal: Float32Array): Float32Array;
    private applyWindow;
    private fft;
    computeMelSpectrogram(audioSegment: AudioSegment): Float32Array;
    reshapeForModel(melSpectrogram: Float32Array, numFrames: number): Float32Array;
}
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