export declare class AudioFile {
    rate: number;
    samples: Int16Array;
    constructor(rate: number, samples: Int16Array);
}
/**
 * Simple high-pass filter.
 *
 * @param samples samples to filter.
 * @param size size of filter
 * @returns filtered samples.
 */
export declare function highPassFilter(samples: Int16Array, size: number): Int16Array;
/**
 * @param frame the frame number to be described as a timestamp.
 * @param hz number of frames per second in original recording.
 * @param brief omit hour if zero, omit milliseconds and frame itself.
 */
export declare function frameToTimestamp(frame: number, hz: number, brief?: boolean): string;
/**
 * @param frame the frame duration to be described as a string.
 * @param hz number of frames per second in original recording.
 */
export declare function frameDurationToString(frame: number, hz: number): string;
/**
 * Return the total number of audio samples in the list of audio samples.
 */
export declare function totalAudioSamples(samplesList: Int16Array[]): number;
/**
 * Concatenate a list of audio samples into one.
 */
export declare function concatAudio(samplesList: Int16Array[]): Int16Array;
/**
 * Clamp the number to the range of signed 16-bit int.
 */
export declare function clampToInt16(x: number): number;
/**
 * Generate a certain amount of silence.
 */
export declare function makeSilence(seconds: number, sampleRate: number): Int16Array;
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