import { Filter, FilterStreamRef } from '../../../Filter';
import { Stream } from '../../../Compiler';
/**
  * 9.6 hilbert
  * Generate odd-tap Hilbert transform FIR coefficients.
  *
  * The resulting stream can be used with afir filter for phase-shifting the signal by 90 degrees.
  *
  * This is used in many matrix coding schemes and for analytic signal generation. The process is often written as a multiplication by i (or j), the imaginary unit.
  *
  * The filter accepts the following options:
  */
export declare class AudioHilbert extends Filter<AudioHilbertParameters> {
    outputs: FilterStreamRef<AudioHilbertParameters, AudioHilbert>[];
    constructor(inputs?: Stream | Stream[], parameters?: AudioHilbertParameters);
}
export interface AudioHilbertParameters {
    /**
      * Set sample rate, default is 44100.
      * @aliases s
      */
    sample_rate?: string | number;
    /**
      * Set sample rate, default is 44100.
      * @aliasof sample_rate
      */
    s?: string | number;
    /**
      * Set length of FIR filter, default is 22051.
      * @aliases t
      */
    taps?: string | number;
    /**
      * Set length of FIR filter, default is 22051.
      * @aliasof taps
      */
    t?: string | number;
    /**
      * Set number of samples per each frame.
      * @aliases n
      */
    nb_samples?: string | number;
    /**
      * Set number of samples per each frame.
      * @aliasof nb_samples
      */
    n?: string | number;
    /**
      * Set window function to be used when generating FIR coefficients.
      * @aliases w
      */
    win_func?: string | number;
    /**
      * Set window function to be used when generating FIR coefficients.
      * @aliasof win_func
      */
    w?: string | number;
    [key: string]: string | number;
}
/**
  * 9.6 hilbert
  * Generate odd-tap Hilbert transform FIR coefficients.
  *
  * The resulting stream can be used with afir filter for phase-shifting the signal by 90 degrees.
  *
  * This is used in many matrix coding schemes and for analytic signal generation. The process is often written as a multiplication by i (or j), the imaginary unit.
  *
  * The filter accepts the following options:
  */
export declare function audioHilbert(inputs?: Stream | Stream[], parameters?: AudioHilbertParameters): AudioHilbert;