Highlights⌗

Description⌗

AnalyseAudio is a realtime spectrogram viewer written in C# with the recent framework for Windows, WinUI 3.

The core package used to draw the spectrogram is Spectrogram by Scott W Harden. AnalyseAudio is simply an interface to create a bridge from an audio source and to configure a SpectrogramGenerator. The project would have been different without this package.

The application is in four parts:

  • Capture: Select a source type (Microphone, Speaker, WASAPI), a source, a sample rate and a number of bits per sample. Button to start and stop the generator.
  • Spectrogram: View the spectrogram and configure it with FFT and display settings
  • Piano: Do music with sin/triangle/square/sawtooth waves and white/pink noises.
  • Console: See logs of the application (used for development)

Comparison with Audacity:

FeatureAnalyseAudioAudacity
RealtimeYes (about 100 ms of delay)Render every 5 seconds
Spectrogram anchorFixed on the right, or rollingJump to the record cursor
Keep previous valuesNo, memory usage is constantYes, requires more memory over time
FFT config changesClear the spectrogramSpectrogram updated with previous samples
Audio SourcesLive only (In/Out device, WASAPI)Devices, streams, files, …
ChannelsOnly 1 channel supportedOne spectrogram per channel
Other benefitsIndependent window, lightwayMore tools and configurations

The application is translated in English and French.

Context⌗

AnalyseAudio was a project of 4CI02, Projet scientifique, made in two weeks.

The project had to be C++ or C#. I chose C# to take advantage of the easy configuration of audio devices, especially with WASAPI. I also chose C# because of WinUI 3, the latest and most interesting Microsoft framework at the time of the project.

Overview⌗

1. Select a capture device (Microphone, Speaker, WASAPI) and start the generator
Capture page - Two combobox to select the device type and the device, three spinbox to configure the sample rate, channels number and bits per sample. A button to start the generator.
2. Configure the spectrogram
Spectrogram page - The spectrogram of a song. A scale on the right displays the frequencies. Current colormap is Viridis. Song used: Fractions by Juniper Vale, I the Ai Remix
3. Try different notes and wave types and watch the result with the standalone spectrogram
Piano page - The spectrogram is visible in the uper-left corner as a standalone window. The spectrogram shows that the notes from C 261.63 Hz to C 523.25 Hz (do to do) where played with the wave type Sawtooth. The note do at 523.25 Hz is still pressed. Colormap is Turbo.