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POReal-time FFT plotting
 

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    <p>I have a bit of am odd question that I am hoping someone here can help me with.</p> <p>BACKGROUND: I am trying to design a system that will take in continuous-time data from a VLF antenna/preamp system which will take that data, do an FFT analysis of on it (magnitude versus time) and plot the resulting FFT data as a real-time spectrogram. The project is what is known as a "hum sniffer" but specifically to see signal interference in the 15 - 35 kHz range. I have purchased a couple of "teach yourself java" books and am in the process of reading them. I am an engineering student with limited experience with programming in Ansi-C and Matlab.</p> <p>QUESTION: There are several applications on the Android market that will perform a similar function using the microphone as the input source and I have purchased all of them just to see how they operate. I have also purchased an Arduino Uno with USB Host shield from Sparkfun as well as a IOIO board from Sparkfun. I am really REALLY hoping that I can use a combination of those boards I have purchased in conjunction with the aforementioned antenna/preamp system to plot those real-time spectrograms in an Android program I have yet to create. </p> <p>I am not looking for anyone to hold my hand through this process but if anyone has any experience with anything similar I would appreciate any insight. My major concern at this point is whether I need to design the external system to do the A/D conversion before feeding that data into the phone or if I might be able to send the CT signal data into Android directly and have the phone do both the A/D conversion and the FFT plots. Oh, and whether or not I can use the USB port to send data into the phone. </p> <p>I am using my Nexus S 4G for all testing/applications.</p> <p>Thanks in advance for any input.</p>
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