Sub-array equalization technique for the parametric array loudspeaker to reduce nonlinear distortion
Sub-array equalization technique for the parametric array loudspeaker to reduce nonlinear distortion
The parametric array loudspeaker (PAL) is a directional loudspeaker which uses the nonlinear acoustic effect, namely the parametric array, to produce an audio beam from narrow ultrasonic beams. The PAL can efficiently deliver audible information, without generating noise to the surroundings. One significant drawback of the PAL is the nonlinear distortion. Therefore, many sophisticated methods have been proposed to preprocess the input signal of the PAL. However, those methods usually request a flat frequency response of the ultrasonic transducer array (UTA). In the past, equalization has been tried out for the whole UTA, but the performance was sometimes not satisfactory due to the inconsistent productions of ultrasonic transducers. This paper proposes to group the ultrasonic transducers by their impedances. Several sub-arrays are thereafter formed and equalized individually. The comparison results demonstrate that the propose sub-array equalization technique can suppress the nonlinear distortion of the PAL more effectively than the previous method.
1497-1504
Institute of Noise Control Engineering of the USA
Zhang, Chi
53d6ffe9-efc7-4dad-a9e7-49d41be079b4
Ren, Jing
ea941efc-4837-435a-a42e-ebaa810c2baf
Shi, Chuang
c46f72bd-54c7-45ee-ac5d-285691fccf81
Zhang, Chi
53d6ffe9-efc7-4dad-a9e7-49d41be079b4
Ren, Jing
ea941efc-4837-435a-a42e-ebaa810c2baf
Shi, Chuang
c46f72bd-54c7-45ee-ac5d-285691fccf81
Zhang, Chi, Ren, Jing and Shi, Chuang
(2021)
Sub-array equalization technique for the parametric array loudspeaker to reduce nonlinear distortion.
In INTER-NOISE and NOISE-CON Congress and Conference Proceedings: InterNoise21, Washington, D.C., USA, pages 970-1944.
Institute of Noise Control Engineering of the USA.
.
(doi:10.3397/IN-2021-1856).
Record type:
Conference or Workshop Item
(Paper)
Abstract
The parametric array loudspeaker (PAL) is a directional loudspeaker which uses the nonlinear acoustic effect, namely the parametric array, to produce an audio beam from narrow ultrasonic beams. The PAL can efficiently deliver audible information, without generating noise to the surroundings. One significant drawback of the PAL is the nonlinear distortion. Therefore, many sophisticated methods have been proposed to preprocess the input signal of the PAL. However, those methods usually request a flat frequency response of the ultrasonic transducer array (UTA). In the past, equalization has been tried out for the whole UTA, but the performance was sometimes not satisfactory due to the inconsistent productions of ultrasonic transducers. This paper proposes to group the ultrasonic transducers by their impedances. Several sub-arrays are thereafter formed and equalized individually. The comparison results demonstrate that the propose sub-array equalization technique can suppress the nonlinear distortion of the PAL more effectively than the previous method.
Text
Noise21_SubPAL_Submission
- Accepted Manuscript
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e-pub ahead of print date: 1 August 2021
Venue - Dates:
Internoise 2021, , Washington, D.C., United States, 2021-08-01 - 2021-08-05
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Local EPrints ID: 484235
URI: http://eprints.soton.ac.uk/id/eprint/484235
PURE UUID: a2688c26-4c31-43d6-9e56-fb7e6f56ed38
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Date deposited: 13 Nov 2023 18:42
Last modified: 18 Mar 2024 04:13
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Author:
Chi Zhang
Author:
Jing Ren
Author:
Chuang Shi
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