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A Solid-State Ion Tweeter
Our Team Members Rob Alejnikov Mark Blattner Colin Joye
Our Advisors Dr. Robert Caverly Dr. Pritpal Singh Dr. Joseph Kozikowski
Presentation Objectives
Need IdentificationProject Objectives and AnalysisPossible SolutionsStrategy
Need Identification
Increase the Range of Optimal Listening AreaQuest for higher Quality Sound Reproduction
Off-Axis Frequency Response
Conventional Speakers Frequency Response degrades as Off-Axis
angle increases Must be On-Axis for
Optimal Frequency Response
Constructive and Destructive Interference causes unpredictable Frequency Attenuations
Project Objectives
Create a Device that Offers the Same Frequency Content in all DirectionsConcentrate on High Frequencies Since They Tend to Beam the Most
Possible Solutions
Line Source Emits a Line Dispersion Pattern
Omni-Polar Siamese Tractrix Produces Radial Dispersion Patterns
Hypersonic Pseudo-Point Source Offers Hemispherical Dispersion Patterns
Omni-Directional Point Source Radiates Spherical Dispersion Patterns
Types of Sources
Line Source Solves Vertical
Positioning Does not solve Horizontal
Omni-Polar (Siamese
Tractrix) Solves Horizontal
Positioning Does not solve Vertical
Types of Sources (cont.)
Hemispherical Source
Solves Horizontal and Vertical Positioning
Uses Beat Frequencies
Requires specific physical positioning
Point Source Solves both Horizontal
and Vertical Positioning
The Point Source Decision
The Point Source Offers Nearly Ideal Spherical Dispersion PatternsCorona Discharge Creates a Nearly Ideal Point SourceUse of CoronaAllows for a More Perfect TransientResponse
Point Source Implementation
Ion Flame Best Practical Point
Source Existing Ion Tweeters
use Vacuum Tubes, creating Excessive Heat
Higher Efficiency could lead to wider Frequency Response
Goal Raise Efficiency, then
widen Frequency Response
Strategy
Model Corona Discharge as an RLC CircuitModel Existing Ion Tweeters with above modelDesign and Build Efficient, High-Voltage CircuitControl High-Voltage Circuit With Audio SignalTime Permitting, Upsize High-Voltage CircuitTime Permitting, Design/Build Power Supply
Semester Plan
Join Us…
At http://ee.vill.edu/ion to Monitor Our Progress
References Olson,Harry F. Modern Sound Reproduction. Van
Nostrand Reinhold company, New York, 1972. Pg30 Web References are Located on Our Web Page
Questions????