Theory and modulation methods of the length-limited parametric array loudspeaker
Theory and modulation methods of the length-limited parametric array loudspeaker
This paper presents the theory and modulation methods of the length-limited parametric array loudspeaker (PAL). The PAL is a directional sound device using the nonlinear acoustic effect to generate an audio beam in air. The audio signal is modulated on an ultrasonic carrier before being transmitted. The audio beam, once formed, lasts until it is absorbed. The length-limited PAL targets to control the length of the audio beam by using two different ultrasonic carriers. The simulation and experiment works to validate the feasibility of the length-limited PAL have been formerly reported. However, there is a lack of theory and modulation methods of the length-limited PAL. An extension to the Westervelt’s derivation is thus adopted to model the length-limited PAL. Based on this model equation, specific modulation methods are newly proposed.
1641-1647
International Institute of Acoustics and Vibration
Shi, Chuang
c46f72bd-54c7-45ee-ac5d-285691fccf81
1 November 2018
Shi, Chuang
c46f72bd-54c7-45ee-ac5d-285691fccf81
Shi, Chuang
(2018)
Theory and modulation methods of the length-limited parametric array loudspeaker.
In 25th International Congress on Sound and Vibration 2018 (ICVS 25): Hiroshima Calling.
International Institute of Acoustics and Vibration.
.
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Conference or Workshop Item
(Paper)
Abstract
This paper presents the theory and modulation methods of the length-limited parametric array loudspeaker (PAL). The PAL is a directional sound device using the nonlinear acoustic effect to generate an audio beam in air. The audio signal is modulated on an ultrasonic carrier before being transmitted. The audio beam, once formed, lasts until it is absorbed. The length-limited PAL targets to control the length of the audio beam by using two different ultrasonic carriers. The simulation and experiment works to validate the feasibility of the length-limited PAL have been formerly reported. However, there is a lack of theory and modulation methods of the length-limited PAL. An extension to the Westervelt’s derivation is thus adopted to model the length-limited PAL. Based on this model equation, specific modulation methods are newly proposed.
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Published date: 1 November 2018
Venue - Dates:
25th International Congress on Sound and Vibration 2018: Hiroshima Calling, ICSV 2018, , Hiroshima, Japan, 2018-07-08 - 2018-07-12
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Local EPrints ID: 484469
URI: http://eprints.soton.ac.uk/id/eprint/484469
PURE UUID: c103787c-b4ac-4176-a8b3-05d46beabb95
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Date deposited: 16 Nov 2023 13:17
Last modified: 07 Mar 2024 03:09
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Author:
Chuang Shi
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