Efficient technique of driving a directional loudspeaker
In modern society, continuous advancements in industries such as the media and the military have led to a push for greater technology in sound reproduction. There are directional loudspeakers that offer impressive audio directionality [1]. Such loudspeakers can improve the the immersive multimedia e...
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sg-ntu-dr.10356-539202023-07-07T18:07:16Z Efficient technique of driving a directional loudspeaker Lim, Fabian Zi Yao. Chong Yong Kim Gan Woon Seng School of Electrical and Electronic Engineering DRNTU::Engineering::Electrical and electronic engineering::Power electronics DRNTU::Engineering::Electrical and electronic engineering::Electronic systems::Signal processing In modern society, continuous advancements in industries such as the media and the military have led to a push for greater technology in sound reproduction. There are directional loudspeakers that offer impressive audio directionality [1]. Such loudspeakers can improve the the immersive multimedia experience for the consumer or provide a means for specialized directional communications. A type of directional loudspeaker – the parametric loudspeaker, is one of such that can achieve high degree of audio directionality by its specialized use of ultrasonic emitters. While the parametric loudspeaker is a proven concept, it is known to have low electric-to-acoustic radiant power conversion efficiency due to the impedance mismatch between the circuit and the piezoelectric ultrasonic emitters [1]. One way to improve the conversion efficiency is to use a Class D amplifier in the integrated parametric loudspeaker system. Thus this project explores an efficient means to drive a parametric loudspeaker by means of a Class D amplifier based on the Nicera design schematic. This project will also explore a digital alternative to PWM signal generation by programming the Blackfin ADSP-BF533 Evaluation Board, to drive the Class D amplifier MOSFETs. This will replace the PWM signal generator component based on the popular 555 timer chip in the original Nicera Class D amplifier design setup. Bachelor of Engineering 2013-06-10T04:26:20Z 2013-06-10T04:26:20Z 2013 2013 Final Year Project (FYP) http://hdl.handle.net/10356/53920 en Nanyang Technological University 99 p. application/pdf text/html text/html text/html text/html text/html text/html text/html text/html text/html text/html text/html text/html text/html text/html text/html text/html |
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DRNTU::Engineering::Electrical and electronic engineering::Power electronics DRNTU::Engineering::Electrical and electronic engineering::Electronic systems::Signal processing Lim, Fabian Zi Yao. Efficient technique of driving a directional loudspeaker |
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In modern society, continuous advancements in industries such as the media and the military have led to a push for greater technology in sound reproduction. There are directional loudspeakers that offer impressive audio directionality [1]. Such loudspeakers can improve the the immersive multimedia experience for the consumer or provide a means for specialized directional communications. A type of directional loudspeaker – the parametric loudspeaker, is one of such that can achieve high degree of audio directionality by its specialized use of ultrasonic emitters.
While the parametric loudspeaker is a proven concept, it is known to have low electric-to-acoustic radiant power conversion efficiency due to the impedance mismatch between the circuit and the piezoelectric ultrasonic emitters [1]. One way to improve the conversion efficiency is to use a Class D amplifier in the integrated parametric loudspeaker system. Thus this project explores an efficient means to drive a parametric loudspeaker by means of a Class D amplifier based on the Nicera design schematic.
This project will also explore a digital alternative to PWM signal generation by programming the Blackfin ADSP-BF533 Evaluation Board, to drive the Class D amplifier MOSFETs. This will replace the PWM signal generator component based on the popular 555 timer chip in the original Nicera Class D amplifier design setup. |
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Chong Yong Kim |
author_facet |
Chong Yong Kim Lim, Fabian Zi Yao. |
format |
Final Year Project |
author |
Lim, Fabian Zi Yao. |
author_sort |
Lim, Fabian Zi Yao. |
title |
Efficient technique of driving a directional loudspeaker |
title_short |
Efficient technique of driving a directional loudspeaker |
title_full |
Efficient technique of driving a directional loudspeaker |
title_fullStr |
Efficient technique of driving a directional loudspeaker |
title_full_unstemmed |
Efficient technique of driving a directional loudspeaker |
title_sort |
efficient technique of driving a directional loudspeaker |
publishDate |
2013 |
url |
http://hdl.handle.net/10356/53920 |
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1772827119477325824 |