Results
Detected/selected vibrato region is highlighted.
ROI: automatic vibrato region. Drag across the F0 plot to select a stable manual ROI.
For singing passages, drag across the most stable part of the vibrato if the automatic region includes onset, offset, or non-vibrato material.
Instructions
Quick start
- Record or upload a sustained note or singing passage.
- Check the highlighted vibrato region.
- Drag on the F0 plot to define a manual ROI if needed.
- Use the app zoom control to fit the full interface to your browser.
For better F0 tracking, prefer an external microphone or audio interface. Webcam microphones may filter low notes.
CoreFM (Core Frequency Modulation)
Pedagogic explanation
CoreFM describes the regularity of the measured F0 modulation. It is not a judgment of vocal quality, beauty, or technique.
- 80–100: high frequency-modulation regularity;
- 65–79: moderate-to-high regularity;
- 50–64: variable but partially organized;
- < 50: low regularity or unreliable tracking.
About VibratoScope Web Lite
VibratoScope Web Lite is a browser-only prototype inspired by the VibratoScope desktop app. Developed by Dr. Tiago Lima Bicalho Cruz, it keeps audio in the browser and does not upload recordings to a server.
The free desktop software is available at Fonotech Academy.