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iRoq

iRoq. Chad, Jamal, Ryan. Chad Ostrowski. Electrical Engineering & Engineering Science. Coursework/Interests Artificial Neural Networks & Learning Machines Analytical Modeling Usability. Jamal Spearmon. Electrical Engineering. Coursework/Interests Satellite Comm. Systems RF Engineering

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iRoq

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  1. iRoq Chad, Jamal, Ryan

  2. Chad Ostrowski Electrical Engineering & Engineering Science Coursework/Interests Artificial Neural Networks & Learning Machines Analytical Modeling Usability

  3. Jamal Spearmon Electrical Engineering Coursework/Interests Satellite Comm. Systems RF Engineering Comm. Networks

  4. Ryan Clothier Electrical Engineering Coursework/Interests Industry Quality Engineering Product Realization MOSFET Semiconductor Fabrication Lab Optics

  5. Ultrasonic Directional Speakers

  6. Problems Finding Transducers that operate in desired range Finding components that sample at the rate needed Generating the desired output Parts are cost prohibitive

  7. Technical Update Conceptual Verification from Product Realization Use of Tweeters as opposed to Transducers Eliminated V/F ~ F/V block in design Stereo Signal Output produced by Matlab

  8. Tech Specs Tweeters- 70 [W] RMS per channel Rated @ 8 Ω ± 0.1% Signal to Noise Ratio – 99 dB Overall Frequency Response – 25 Hz to 40 KHz Input signal from soundcard - 175 mV

  9. We Can Hear Ultrasound Beat Frequencies!

  10. Matlab function this=noise(SecsOfPlay,FreqOfPlayLeft,FreqOfPlayRight) if nargin==2 FreqOfPlayRight=FreqOfPlayLeft; end Fs=FreqOfPlayLeft/.05; bits=SecsOfPlay*Fs; NumWavesLeft=.05*bits; NumWavesRight=FreqOfPlayRight*SecsOfPlay; t=linspace(0,bits,bits); y=zeros(bits,2); y(:,1)=sin(2*pi*NumWavesLeft*t); y(:,2)=sin(2*pi*NumWavesRight*t); sound(y,Fs)

  11. Right Channel @ 18880 Hz

  12. Left Channel @ 18000 Hz

  13. Summary High directivity of sound Frequency shifted signal to hear beat freq Offering privacy in a congested world iRoq

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