A few examples (images are clickable):
Audio is processed on the client.
- Download a random birdsong from xeno-canto.org
- Click on the image below to select the birdsong.
- Click zoom-in and zoom-out to adjust sample rate.
- Increase or decrease brightness of the image.
- Alternatively: record some audio using your mic.
This is the good old DFT spectrogram mapped to a circle. Compare (images are clickable):