For detecting the frequencies of the live input, I am using a library from the Astronomical Institute of Leithbridge. Finding the frequency is done using an Async Task so that the processing is done in the background and is different from the UI thread. The frequency spectrum of the microphone is plotted on the display.
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zhaozw/android_hearingaid
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An Android app that takes real time input and plots the frequency spectrum and displays the peak frequency at any time
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