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Published byNoelle Burroughs
Modified over 2 years ago
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
Frequency Range Of Speakers. Frequency Of Subs The Frequency of The 2subwoofers go from Hz.
Introduction to Audio. What is "Audio"? Audio means "of sound" or "of the reproduction of sound“. Specifically, it refers to the range of frequencies.
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ENS 203- Amplitude Modulation and Demodulation Lab 6 Radio Experiment Meric Ozcan After you configure the radio as specified in your lab sheet, you will.
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Ya Bao, South Bank University 1 Noise Richard Read, The Essence of Communications Theory, Chapter 3.
PROJECT MEETING II Theremi n THEREMIN. Variable Oscillator Fixed Oscillator Detector Pitch Control Variable Oscillator Volume Tuning Volume Control Freq.
1 Department of Electrical and Computer Engineering Advisor: Professor Zink Team Acoustic Beamformer Midway Design Review 11/25/2013.
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Digital to Analogue Conversion Natural signals tend to be analogue Need to convert to digital.
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Microphone Array Project ECE5525 – Speech Processing Robert Villmow 12/11/03.
Spectrum Analyzer. Another Oscilloscope??? Like an oscilloscope Oscilloscope in time domain Spectrum analyzer in frequency domain (selectable)
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