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How Is Sound Produced?. Tweeters Use Corona Discharge to Produce Sound Corona is Produced by Dielectric Breakdown Of Air due to Extremely High Voltages Varying Voltage Causes Size of Corona to Vary Variation in Corona Affects Surrounding Air Pressure Causing Sound. Enhancements.

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Presentation Transcript
how is sound produced
How Is Sound Produced?
  • Tweeters Use Corona Discharge to Produce Sound
  • Corona is Produced by Dielectric Breakdown Of Air due to Extremely High Voltages
  • Varying Voltage Causes Size of Corona to Vary
  • Variation in Corona Affects Surrounding Air Pressure Causing Sound
enhancements
Enhancements
  • More efficient use of power due to use of modern semiconductors instead of vacuum tubes.
  • Wider Frequency response Expected from a higher power Efficiency
  • Smaller physical size of system.
  • Less heat radiated by components.
coil research
Coil Research
  • Forms resonant circuit due to winding self-capacitance
  • Coil wound with thick wire to minimize resistive loss.
  • Uses air-core coil for minimal hysteresis.
why use ion tweeters
Why Use Ion Tweeters?
  • Nearly perfect transient response
  • Omnidirectionality
    • Normal tweeters beam high frequencies, distorting off-axis sound.
    • Ion tweeters have equalfrequency content in all directions.
specifications
Specifications
  • Resonant high voltage oscillator operates at ~9.1MHz.
  • Output voltage to sustain corona discharge must be greater than 20,000 volts. 1 millimeter of corona forms for every 2,000 volts above this reference.
  • Power consumption to be less than 200watts.
oscillator theory
Oscillator Theory
  • The use of feedback keeps the coil locked in at its self-resonant frequency.
  • The feedback signals interrupts current via the switching device.
  • The quickly changing current in the coil causes high voltage to be produced.
team members
Team Members

Group 21

Rob Alejnikov

Mark Blattner

Colin Joye

specifications frequency response
Specifications & Frequency Response
  • Gain
    • Variable from zero to 60
  • High Pass Filter
    • Cutoff at 2 kHz, 12 dB/octave
  • Low Pass Filter
    • Cutoff at 40 kHz, 12 dB/octave
  • Low Power Consumption
    • Consumes 0.36 Watts
  • High quality op-amps
    • LF356 audio op-amps
advisors
Advisors
  • Academia
      • Dr. Robert Caverly
      • Dr. Joseph Kozikowski
      • Dr. Pritpal Singh
  • Industry
      • Mr. Joseph Fell