Sound Visualizer for Classrooms
Sound is invisible, which is exactly why it’s hard to teach. Put AudioVisualize on the projector, press Microphone and students can see what they hear: a high note squeezes the waveform, a low one stretches it, and a guitar chord splits into a ladder of harmonics on the spectrogram.
It runs in any modern browser with no installs and no student accounts, and nothing that the microphone hears is recorded or uploaded.
Recommended setups
Spectrogram
Time against frequency on a log scale — ideal for harmonics, vowels, birdsong and instrument timbre.
Spectrogram · 1080p · 1920×1080
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Oscilloscope waveform
The raw shape of the sound. Whistle, hum or sing and watch wavelength change with pitch.
Waveform · 1080p · 1920×1080
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Frequency bars
A 64-band spectrum analyzer from bass to treble. The Bass Test preset sweeps from 20 Hz upward.
Bars · 1080p · 1920×1080
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Start with the Bass Test sweep
The Bass Test demo is a sine sweep followed by sub-bass hits. It shows a single frequency moving cleanly across the spectrum before you introduce messier real-world sounds.
Compare instruments
Play the same note on a recorder, a violin and a voice. The fundamental lines up on the spectrogram, but the harmonics above it — the timbre — look completely different.
Turn off noise reduction
The visualizer asks the browser for a raw microphone signal. If the display looks gated or flat, check that your laptop’s audio software isn’t suppressing noise.
Save frames for worksheets
Pause and use the camera button to save a PNG of any moment for slides, worksheets or lab reports.