Spectrogrammer

Android app that shows a spectrogram

Disclaimer:

The code for this project is just an experiment doesn't follow best practices.

Features

• Low latency audio processing, uses
  • Multithreaded native code
  • OpenSL
• Spectrum types:
  • FFT, for scientific purposes
    • Up to 8192 frequency bins
    • Log/Linear scales
  • Goertzel bank filter, centered at notes frequencies, for tuning instruments
• Configurable FFT overlap
• Vertical bars smoothing
• Pan & Zoom
• Measuring cursor

Screenshots

This is me singing from the lowest note I can perform to the highest. I did this just for the screenshot, and it turns out I have the range of a baritono!

And the final Q/A test, displaying Lena(https://www.youtube.com/watch?v=S64FROErFYA), or half of it as YouTube downsampled the sound to 22Khz.