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A fork of Audio spectrum Analyzer for Android (See README.old for its original readme)
This software shows the frequency components' magnitude distribution (called spectrum) of the sound heard by your cell phone. Can be used to help tuning musical instrument or tone in singing, (tentative) measure environmental noise and sound revent education or experiments.
This app does not send any personal or non-personal information in any form over network.
Only with user's permission and explicit order, this app can store microphone data on the user's device.
The permission to read microphone is required because that is the essential data this app needs to compute and display the spectrum and spectrogram.
The permission to read and write storage is for saving microphone data (in WAV PCM format) only and is optional. This is provided for convenience of user (e.g. user might want to use another app to process the recorded data). It is user's responsibility to remove the recorded data if they are no longer needed.
This software, Audio Spectrum Analyzer for Android, is released under the Apache License, Version 2.0.
Copyright thinkingcow, bewantbe, woheller69
The whole program structure is roughly follows the MVC model:
AnalyzerActivity.java is the controler, as the main activity, it receives user inputs and system events, then sent corresponding commands to views or sampling and analyzing procedures.
AnalyzerViews.java is the view in MVC. It is used to manage (initialization, display, refresh) UI texts, buttons, dialogs and graphics. AnalyzerGraphic.java is a main sub-view which manage display of spectrum(SpectrumPlot.java) and spectrogram(SpectrogramPlot.java).
SamplingLoop.java is more or less the "model" part. It performs the sampling and FFT analysis, and inform the graphics update.
The data process loop is located in run()
in SamplingLoop.java (after commit c9e430b (Feb 06, 2017), but basicly this process didn't change since the initial commit), as well as the trigger of graphics refresh.
In every loop of while (isRunning)
, it reads a chunk of audio samples by
record.read(audioSamples, 0, readChunkSize);
, then "stream" it to STFT.java
by
stft.feedData(audioSamples, numOfReadShort);
which calculates RMS and FFT whenever enough data is collected. The view is then informed through
activity.analyzerViews.update(spectrumDBcopy);
which ultimately calls invalidate()
of the graphic view to request an update, then the AnalyzerGraphic.onDraw(Canvas c)
will be called automatically.