Weighted Orthogonal Vector Rejection Method for Loudspeaker-Based Binaural Audio Reproduction

Hamdan, Eric; Fazi, Filippo Maria

doi:10.1109/taslp.2021.3080915

Cited by 2 publications

(2 citation statements)

References 21 publications

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“…These could be further classified into uniform or non-uniform depending on the inter-element distance or pitch [5]. Owing to their versatility, they have found applications in RADAR [6], 5G communication [7][8][9], binaural audio synthesis [10,11], home audio [12][13][14], ultrasound imaging [15,16], structural health monitoring [17][18][19][20][21][22][23][24], acoustic levitation [25], and acoustic holography [26], to name a few.…”

Section: Introductionmentioning

confidence: 99%

On-demand harmonic wave suppression in non-Hermitian space-time-periodic phased arrays

Adlakha

Nouh

2023

Smart Mater. Struct.

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Phased arrays have been a cornerstone of non-destructive evaluation, sonar communications, and medical imaging for years. Conventional arrays work by imparting a static phase gradient across a set of transducers to steer a self-created wavefront in a desired direction. Most recently, space-time-periodic (STP) phased arrays have been explored in the context of multi-harmonic wave beaming. Owing to the STP phase profile, multiple scattered harmonics of a single-frequency input are generated which propagate simultaneously in different directional lanes. Each of these lanes is characterized by a principal angle and a distinct frequency signature that can be computationally predicted. However, owing to the Hermitian (real) nature of the spatiotemporal phase gradient, waves emergent from the array are still bound to propagate simultaneously along up- and down-converted directions with a perfectly symmetric energy distribution. Seeking to push this boundary, this paper presents a class of non-Hermitian STP phased arrays which exercise a degree of unprecedented control over the transmitted waves through an interplay between gain, loss, and coupling between its individual components. A complex phase profile under two special symmetries, PT and anti-PT, is introduced that enables the modulation of the amplitude of various harmonics and decouples up- and down-converted harmonics of the same order. We show that these arrays provide on-demand suppression of either up- or down-converted harmonics at an exceptional point – a degeneracy in the parameter space where the system’s eigenvalues and eigenvectors coalesce. An experimental prototype of the non-Hermitian array is constructed to illustrate the selective directional suppression via time-transient measurements of the out-of-plane displacements of an elastic substrate via laser vibrometry. The theory of non-Hermitian phased arrays and their experimental realization unlock rich opportunities in precise elastoacoustic wave manipulation that can be tailored for a diverse range of engineering applications.

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Section: Introductionmentioning

confidence: 99%

On-demand harmonic wave suppression in non-Hermitian space-time-periodic phased arrays

Adlakha

Nouh

2023

Smart Mater. Struct.

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“…If using a pair of loudspeakers, unwanted crosstalk from each loudspeaker to the opposite ear occurs. Crosstalk cancellation is necessary to invert the transfer function of transmission paths [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Autonomous Technology for 2.1 Channel Audio Systems

Yao¹,

Huang²

2022

Electronics

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During the COVID-19 pandemic, smart home requirements have shifted toward entertainment at home. The purpose of this research project was therefore to develop a robotic audio system for home automation. High-end audio systems normally refer to multichannel home theaters. Although multichannel audio systems enable people to enjoy surround sound as they do at the cinema, stereo audio systems have been popularly used since the 1980s. The major shortcoming of a stereo audio system is its narrow listening area. If listeners are out of the area, the system has difficulty providing a stable sound field. This is because of the head-shadow effect blocking the high-frequency sound. The proposed system, by integrating computer vision and robotics, can track the head movement of a user and adjust the directions of loudspeakers, thereby helping the sound wave travel through the air. Unlike previous studies, in which only a diminutive scenario was built, in this work, the idea was applied to a commercial 2.1 audio system, and listening tests were conducted. The theory and the simulation coincide with the experimental results. The approximate rate of audio quality improvement is 31%. The experimental results are encouraging, especially for high-pitched music.

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Weighted Orthogonal Vector Rejection Method for Loudspeaker-Based Binaural Audio Reproduction

Cited by 2 publications

References 21 publications

On-demand harmonic wave suppression in non-Hermitian space-time-periodic phased arrays

On-demand harmonic wave suppression in non-Hermitian space-time-periodic phased arrays

Autonomous Technology for 2.1 Channel Audio Systems

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