/**
 * AudioFilter.ts
 *
 * Audio filters: low-pass, high-pass, band-pass,
 * parametric EQ, resonance, and cascaded biquads.
 *
 * @module audio
 */
export type FilterType = 'lowpass' | 'highpass' | 'bandpass' | 'notch' | 'peaking';
export interface FilterConfig {
    type: FilterType;
    frequency: number;
    q: number;
    gain: number;
}
export interface EQBand {
    id: string;
    config: FilterConfig;
    enabled: boolean;
}
export declare class AudioFilter {
    private bands;
    addBand(id: string, config: FilterConfig): void;
    removeBand(id: string): void;
    setBandEnabled(id: string, enabled: boolean): void;
    setFrequency(id: string, freq: number): void;
    setQ(id: string, q: number): void;
    setGain(id: string, gain: number): void;
    getResponse(frequency: number): number;
    private computeBandResponse;
    getBand(id: string): EQBand | undefined;
    getBandCount(): number;
    getEnabledBandCount(): number;
}
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