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Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

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Binaural Heterophasic Superdirective Beamforming.

Yuzhu Wang¹, Jingdong Chen¹, Jacob Benesty²

¹Center of Intelligent Acoustics and Immersive Communications, Northwestern Polytechnical University, 127 Youyi West Road, Xi'an 710072, China.

Sensors (Basel, Switzerland)

|December 30, 2020

Summary

A new binaural superdirective beamformer tackles white noise amplification in acoustic signal processing. This method enhances the human auditory system's ability to separate desired signals from noise.

Keywords:

beampattern binaural beamforming directivity factor heterophasic interaural coherence microphone arrays superdirective beamformer white noise gain

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Last Updated: Nov 23, 2025

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

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Published on: June 7, 2019

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Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station

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Published on: April 1, 2020

Area of Science:

Acoustic Signal Processing
Psychoacoustics
Auditory Perception

Background:

Superdirective beamformers are effective for broadband acoustic signals but amplify white noise.
Conventional beamformers require extremely low self-noise sensors, which are difficult to achieve.
Existing methods struggle with effective noise reduction in complex acoustic environments.

Purpose of the Study:

To propose a novel binaural superdirective beamformer design.
To address the challenge of white noise amplification in acoustic signal processing.
To improve the separation of target acoustic signals from noise for enhanced auditory perception.

Main Methods:

Developed a binaural beamformer composed of two orthogonal sub-beamformers.
Applied psychoacoustic principles to design filters that decorrelate white noise components.
Maximized interaural coherence for diffuse noise to aid sound source localization.

Main Results:

The proposed binaural beamformer produces in-phase signals of interest and random-phase white noise.
Experimental results demonstrate superior performance compared to conventional monaural beamformers.
The design facilitates better separation of acoustic signals from white noise by the human auditory system.

Conclusions:

The novel binaural superdirective beamformer effectively mitigates white noise amplification.
This approach leverages psychoacoustic principles for improved noise reduction and source localization.
The proposed method offers a significant advancement over traditional monaural beamforming techniques.