问题
I am building on an app which has a function which records the sound which comes in the microphone. It would be handy to give a graphical view of the incoming sound, like http://www.filebuzz.com/software_screenshot/full/10920-Audio_Edit.gif for example.
I searched a little bit for a tutorial online, but the only thing I found was Audalyzer, but it is difficult for me to get a grip on it, it also is using the whole interface and not clear how to implement it as a widget...
Maybe somebody knows a good tutorial or example code on this?
回答1:
You'd probably want to use a Fast Fourier Transform for this.
I'd try jTransforms: https://sites.google.com/site/piotrwendykier/software/jtransforms
The blog here: http://trueharmoniccolours.co.uk/Blog/ gives a good introduction into what the FFT does and how you can turn it into a chart. I fear that by the end of this you'll understand FFTs though...
来源：https://stackoverflow.com/questions/15338298/graphic-sound-analyzer-of-microphone