1	A Novel Sound Reproduction System
2	Background
3	Background
4	Background
5	Background
6	Background
7	Background
8	Background
9	Background
10	Background
11	Background
12	Background
13	Past and Present Development May 2000 Texas Instruments: S$60K (Equipment) Jun 2000 Ministry of Education: S$164K [Devices) Jul 2000 A*STAR: S$520K (Manpower/Equipment) Mar 2001 NTU: S$490K [Manpower] Mar 2001 Development of 1^st working prototype Apr 2001 In-depth theoretical analysis and review Jul 2001 Emitter research and development Aug 2001 Beamforming and steering research Sep 2001 Development of real-time DSP pre-processing
14	Past and Present Development Sep 2001 Fabrication of 2^nd working prototype in real-time Oct 2001 Expanded to a total strength of 12 research members Nov 2001 Filed application for 2 Singapore patents Dec 2001 Established current research focus in DSP, emitter and amplifier developments Apr 2002 Developed research link with Prof Tomoo Kamakura (Univ. of Electro-Communications, Japan) May 2002 Filed application for PCT patent in beamsteering Jul 2002 Expanded to a total strength of 13 research members
15	Past and Present Development Sep 2002 Application for 2^nd PCT patent in distortion correction in preparation Oct 2002 Research on digital class-D amplifiers Nov 2002 FPGA-based DSP hardware development Dec 2002 NTU visit by ATC VP Business, Mr Bob Todrank Jan 2003 Joint-exploration with ATC in research and potential business development Mar 2003 Development of current FPGA/class-D amplifier prototype unit with ATC HSS emitter
16	Past and Present Development Apr 2003 Visits and presentations at the Esplanade, National Library Board and Art Museum May 2003 Application for TEC funding for public service trials Jun 2003 Submission of A*STAR funding application
17	Theory
18	Theory
19	Theory
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25
26	Current Research Focus (DSP) Baseband distortion correction Bass perception enhancement Dynamic range control Digital beamforming and steering control of audio beam FPGA-based DSP hardware development
27	Current Research Focus (Emitter) Array simulation and modeling Nonlinear wave propagation models Emitter array design, prototyping and measurements Emitter material research and process
28	Current Research Focus (Amplifier) Power-efficient class-D amplification of ultrasonic signals with low switching rate Miniaturization for small footprint and light weight Robustness to handle capacitive emitter loads
29	Current Research Focus (Results)
30	Current Research Focus (Results)
31	Current Research Focus (Results)
32	Audio Beam Prototypes
33	Prototypes (Emitters)
34	Prototypes (Emitters)
35	Prototypes (Emitters)
36	Prototypes (DSP/Amplifier)
37	Prototypes (DSP/Amplifier)
38	Prototypes (DSP/Amplifier)
39	Prototypes (DSP/Amplifier)
40	Hardware Setup
41	Hardware Setup
42	Hardware Setup
43	Hardware Setup
44	Experiments
45	Experiment 1
46	Experiment 2
47	Experiment 3
48	Experiment 4 (part 1)
49	Experiment 4 (part 2)
50	Applications
51	Applications
52	Applications
53	Applications
54	Applications
55	Milestones Achieved
56	Milestones Achieved
57	Milestones Achieved
58	Audio Beam Group
59	Future Research Theoretical and practical investigation of electronic beam control via array focusing and steering methods Advanced acoustic research on piezoelectric materials (PVDF/PZT), MEMS-based array design and prototype development Development of acoustic range and directivity control methods in both parametric emitters and conventional loudspeakers Development of integrated FPGA core for proprietary DSP algorithms and PWM control in digital amplifiers
60	Acknowledgements Project Team Assoc Prof Woon-Seng Gan Dr Jun Yang Kelvin Lee Furi Andi Karnapi Yi Wang Dennis Koh Khim-Sia Tan Kan Sha Project Advisors Prof Meng-Hwa Er Mr Venkataraman Sridhar Mr Ramesh Samtani Technical/Admin Support Sung-Kheng Yeo Say-Cheng Ong