Spectrum Analyzer
See the frequencies in a voice, instrument or audio file
See which frequencies make up a sound and how they change over time. Compare a pure test tone with a voice, instrument or audio file.
Key idea
A spectrum shows how signal energy is distributed across frequency; a spectrogram adds the time dimension. A waveform instead shows the signal changing moment by moment. These are different views of the same input.
Try this first
Compare a pure test tone with a sung vowel. Look for the fundamental and the additional components, then use the spectrogram to follow how they change over time. Keep the input steady before changing analysis settings.
How to get started
- Press Start microphone and allow access, or choose an audio file or the built-in test tone.
- Compare the spectrum, spectrogram, oscilloscope and radial views while making or playing a sound.
- Adjust gain and smoothing for a readable display; Freeze holds the picture for inspection. Keep microphone monitoring off unless you need to hear it.
Explore a little further
Try another experiment
Sustain two different vowels at approximately the same pitch. Compare the harmonic spacing with the relative strength of the peaks. Notice how the sound can change without a large change in its fundamental pitch.
Good to know
Microphone readings depend on your device, input processing and surroundings. This analyzer is a learning tool, not a calibrated sound-level meter or a hearing test.
Public Lite tools share 20 free minutes a day, without an account. New accounts receive a 10-day full-access trial without a card. Paid access continues under the selected plan.
Compare access options →