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Chad, Jamal, Ryan
Chad Ostrowski Coursework/Interests Artificial Neural Networks & Learning Machines Analytical Modeling Usability Electrical Engineering & Engineering Science
Jamal Spearmon Coursework/Interests Satellite Comm. Systems RF Engineering Comm. Networks Electrical Engineering
Ryan Clothier Coursework/Interests Industry Quality Engineering Product Realization MOSFET Semiconductor Fabrication Lab Optics Electrical Engineering
Ultrasonic Directional Speakers
Problems Finding Transducers that operate in desired range Finding components that sample at the rate needed Generating the desired output Parts are cost prohibitive
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
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
We Can Hear Ultrasound Beat Frequencies!
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)
Right Channel @ 18880 Hz
Left Channel @ 18000 Hz
Summary High directivity of sound Frequency shifted signal to hear beat freq Offering privacy in a congested world
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