Free Spectrum Analyzer Software

Screenshot of Overtone Analyzer Free Edition

We developed the Free Edition of Overtone Analyzer to give everyone an opportunity to experiment with sound visualization and spectrum analysis, even if they cannot afford to buy our software and would only use freeware.

Overtone Analyzer Free Edition

The Free Edition is a fully fledged spectrum analyzer and spectrogram software and has the same core features as the other editions of Overtone Analyzer. It allows you to visualize any sound coming through your sound card. You can record and visualize your voice or your instrument with a microphone connected to your computer. Most sound cards also allow you to record the sound that is currently being played, so you can also use Overtone Analyzer Free Edition to visualize your existing recordings or live streams from the web.

Interactive Sound Visualization

Like many other freeware spectrum analyzer programs, Overtone Analyzer Free Edition records incoming audio data in an infinite loop and always remembers the last 10 seconds of your recording. So you can always leave it running to continually visualize the sound that you are currently hearing. What sets this program apart is the ability to stop the recording and to replay it, to zoom into the existing data, to scroll back, and to adjust all visualization parameters and update the existing data in real time without having to redo your recording.

In addition, you can use the Overtone Slider Overlay to take precise pitch measurements and to learn about the overtone sequence of your sounds. The piano keyboard shows all pitches in a musical context, while the frequency scale gives a more scientific view. You can display your recording as a spectrogram, a spectrum, a waveform, or an oscilloscope. Of course, the user interface is fully configurable, and all views can be switched on or off.

Spectrum Analyzer and Spectrogram Display

Below are some screenshots of the different display modes (click on the images for a larger version):

Spectrogram of a cello playing the note G2, with the Overtone Slider showing 8 harmonics (including the fundamental frequency) Spectrum Analyzer showing a cello playing the tone G2 Spectrum of a cello playing the tone G2 with the oszillogram showing the actual waveform. The spectrum is now shown with the linear frequency scale, and the overtone sliders are transparent. Spectrogram of the sung overtone scale. The slider overlay shows the position of the harmonics. Harmonics 1 and 2 are the fundamental tone of the voice, and harmonics 5 to 12 are the audible overtones being sung. Spectrogram of the spoken words: 'Overtone Analyzer Free Edition'. Spectrogram of a classical singer singing a vowel sequence. Notice the vibrato (fluctuations in pitch) of the voice.

These features make Overtone Analyzer Free Edition the perfect tool to learn about or teach the basics of the physics of sound, to experiment with the pitch and timbre of your voice, to learn the overtone scale, to get started with overtone singing, or to tune your instrument. There is a lot of free spectrum analyzer software to be found on the web. But we often hear that Overtone Analyzer stands out because of its simple, easy-to-use interface, and the strong aesthetic appeal of its visuals. If there is only one free spectrum analyzer software that you will use today, make it Overtone Analyzer Free Edition.