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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| Other Authors: | |
| Format: | Final Year Project (FYP) |
| Language: | English |
| Published: |
2013
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| Online Access: | http://hdl.handle.net/10356/53920 |
| _version_ | 1826121612074680320 |
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| author | Lim, Fabian Zi Yao. |
| author2 | Chong Yong Kim |
| author_facet | Chong Yong Kim Lim, Fabian Zi Yao. |
| author_sort | Lim, Fabian Zi Yao. |
| collection | NTU |
| description | 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. |
| first_indexed | 2024-10-01T05:35:22Z |
| format | Final Year Project (FYP) |
| id | ntu-10356/53920 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:35:22Z |
| publishDate | 2013 |
| record_format | dspace |
| spelling | ntu-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 |
| spellingShingle | 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 |
| title | 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_short | Efficient technique of driving a directional loudspeaker |
| title_sort | efficient technique of driving a directional loudspeaker |
| topic | DRNTU::Engineering::Electrical and electronic engineering::Power electronics DRNTU::Engineering::Electrical and electronic engineering::Electronic systems::Signal processing |
| url | http://hdl.handle.net/10356/53920 |
| work_keys_str_mv | AT limfabianziyao efficienttechniqueofdrivingadirectionalloudspeaker |