export default Directivity;
/**
 * @class Directivity
 * @description Directivity/occlusion filter.
 * @param {AudioContext} context
 * Associated {@link
https://developer.mozilla.org/en-US/docs/Web/API/AudioContext AudioContext}.
 * @param {Object} options
 * @param {Number} options.alpha
 * Determines directivity pattern (0 to 1). See
 * {@link Directivity#setPattern setPattern} for more details. Defaults to
 * {@linkcode Utils.DEFAULT_DIRECTIVITY_ALPHA DEFAULT_DIRECTIVITY_ALPHA}.
 * @param {Number} options.sharpness
 * Determines the sharpness of the directivity pattern (1 to Inf). See
 * {@link Directivity#setPattern setPattern} for more details. Defaults to
 * {@linkcode Utils.DEFAULT_DIRECTIVITY_SHARPNESS
 * DEFAULT_DIRECTIVITY_SHARPNESS}.
 */
declare class Directivity {
    constructor(context: any, options: any);
    _context: any;
    _lowpass: any;
    _cosTheta: number;
    input: any;
    output: any;
    /**
     * Compute the filter using the source's forward orientation and the listener's
     * position.
     * @param {Float32Array} forward The source's forward vector.
     * @param {Float32Array} direction The direction from the source to the
     * listener.
     */
    computeAngle(forward: Float32Array, direction: Float32Array): void;
    /**
     * Set source's directivity pattern (defined by alpha), where 0 is an
     * omnidirectional pattern, 1 is a bidirectional pattern, 0.5 is a cardiod
     * pattern. The sharpness of the pattern is increased exponenentially.
     * @param {Number} alpha
     * Determines directivity pattern (0 to 1).
     * @param {Number} sharpness
     * Determines the sharpness of the directivity pattern (1 to Inf).
     * DEFAULT_DIRECTIVITY_SHARPNESS}.
     */
    setPattern(alpha: number, sharpness: number): void;
    _alpha: number;
    _sharpness: number;
}