Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/53920
Title: Efficient technique of driving a directional loudspeaker
Authors: Lim, Fabian Zi Yao.
Keywords: DRNTU::Engineering::Electrical and electronic engineering::Power electronics
DRNTU::Engineering::Electrical and electronic engineering::Electronic systems::Signal processing
Issue Date: 2013
Abstract: 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.
URI: http://hdl.handle.net/10356/53920
Rights: Nanyang Technological University
Fulltext Permission: restricted
Fulltext Availability: With Fulltext
Appears in Collections:EEE Student Reports (FYP/IA/PA/PI)

Files in This Item:
File Description SizeFormat 
E3065-121.pdf
  Restricted Access
FYP Final Report2.21 MBAdobe PDFView/Open
redirect_1.html
  Restricted Access
222 BHTMLView/Open
redirect_2.html
  Restricted Access
222 BHTMLView/Open
redirect_3.html
  Restricted Access
222 BHTMLView/Open
redirect_4.html
  Restricted Access
222 BHTMLView/Open
redirect_5.html
  Restricted Access
222 BHTMLView/Open
redirect_6.html
  Restricted Access
222 BHTMLView/Open
redirect_7.html
  Restricted Access
222 BHTMLView/Open
redirect_8.html
  Restricted Access
222 BHTMLView/Open
redirect_9.html
  Restricted Access
222 BHTMLView/Open
redirect_10.html
  Restricted Access
222 BHTMLView/Open
redirect_11.html
  Restricted Access
222 BHTMLView/Open
redirect_12.html
  Restricted Access
222 BHTMLView/Open
redirect_13.html
  Restricted Access
222 BHTMLView/Open
redirect_14.html
  Restricted Access
222 BHTMLView/Open
redirect_15.html
  Restricted Access
222 BHTMLView/Open
redirect_16.html
  Restricted Access
222 BHTMLView/Open

Page view(s) 50

284
Updated on Nov 25, 2020

Download(s) 50

29
Updated on Nov 25, 2020

Google ScholarTM

Check

Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.