Design of parametric loudspeaker

Based on parametric array theory and nonlinear acoustic interaction theory, a parametric loudspeaker (a type of directional sound generator) was designed and implemented in this project. A parametric loudspeaker modulates and transmits audio signal with ultrasound carrier, and demodulates the signal...

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Main Author: Gao, Huiying
Other Authors: Chang, Joseph Sylvester
Format: Final Year Project
Language:English
Published: 2015
Subjects:
Online Access:http://hdl.handle.net/10356/64616
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-646162023-07-07T16:07:25Z Design of parametric loudspeaker Gao, Huiying Chang, Joseph Sylvester School of Electrical and Electronic Engineering DRNTU::Engineering::Electrical and electronic engineering Based on parametric array theory and nonlinear acoustic interaction theory, a parametric loudspeaker (a type of directional sound generator) was designed and implemented in this project. A parametric loudspeaker modulates and transmits audio signal with ultrasound carrier, and demodulates the signal with nonlinear interaction in air. The parametric loudspeaker designed in this project consists of four parts, signal processing circuit, audio amplifier, DC-DC voltage convertor and ultrasound transducers array, of which the DC-DC voltage convertor was not contained in other typical parametric loudspeakers. The signal processing part was designed based on square-root amplitude modulation (SRAM) theory, and double-integration was utilized in the signal pre-processing stage to reduce nonlinear distortion of parametric array. The addition of the DC-DC voltage convertor help to boost the voltage of amplified signal to drive the ultrasound emitter, and thus the required operation voltage of this design was reduced by 2/3, which means the power-consumption of this parametric loudspeaker could be much lower than a typical one. This project was to test the feasibility to solve the high power-consumption problem of parametric loudspeaker with this method. Bachelor of Engineering 2015-05-29T01:35:59Z 2015-05-29T01:35:59Z 2015 2015 Final Year Project (FYP) http://hdl.handle.net/10356/64616 en Nanyang Technological University 56 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering::Electrical and electronic engineering
spellingShingle DRNTU::Engineering::Electrical and electronic engineering
Gao, Huiying
Design of parametric loudspeaker
description Based on parametric array theory and nonlinear acoustic interaction theory, a parametric loudspeaker (a type of directional sound generator) was designed and implemented in this project. A parametric loudspeaker modulates and transmits audio signal with ultrasound carrier, and demodulates the signal with nonlinear interaction in air. The parametric loudspeaker designed in this project consists of four parts, signal processing circuit, audio amplifier, DC-DC voltage convertor and ultrasound transducers array, of which the DC-DC voltage convertor was not contained in other typical parametric loudspeakers. The signal processing part was designed based on square-root amplitude modulation (SRAM) theory, and double-integration was utilized in the signal pre-processing stage to reduce nonlinear distortion of parametric array. The addition of the DC-DC voltage convertor help to boost the voltage of amplified signal to drive the ultrasound emitter, and thus the required operation voltage of this design was reduced by 2/3, which means the power-consumption of this parametric loudspeaker could be much lower than a typical one. This project was to test the feasibility to solve the high power-consumption problem of parametric loudspeaker with this method.
author2 Chang, Joseph Sylvester
author_facet Chang, Joseph Sylvester
Gao, Huiying
format Final Year Project
author Gao, Huiying
author_sort Gao, Huiying
title Design of parametric loudspeaker
title_short Design of parametric loudspeaker
title_full Design of parametric loudspeaker
title_fullStr Design of parametric loudspeaker
title_full_unstemmed Design of parametric loudspeaker
title_sort design of parametric loudspeaker
publishDate 2015
url http://hdl.handle.net/10356/64616
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