Vocal Formant Frequency Analyzer
Hold a sustained vowel into your microphone and watch its formant frequencies (F1, F2, F3) estimated live, plotted on a vowel-space chart with a nearest-vowel guess.
ℹ Formants are estimated with LPC (linear predictive coding) — an approximation of your vocal-tract resonances. Results depend on your voice, vowel, and microphone: children and higher voices have higher formants than the adult-average reference vowels shown. It works on steady vowels, not consonants or running speech, and isn’t a clinical tool. Your mic is analyzed live and never recorded or uploaded.
Vowel space: F2 (front–back) across, F1 (open–close) down. Dots are adult-average reference vowels; the bright marker is you.
How It Works
A vowel’s character comes from formants — resonant peaks created by the shape of your throat, mouth, and lips. The tool reads a short slice of your microphone, runs linear predictive coding (LPC) to model the spectral envelope as a set of resonances, and reads the lowest peaks as F1, F2, and F3. F1 tracks how open your mouth is (higher = more open, like “ah”); F2 tracks front-vs-back tongue position (higher = more front, like “ee”). Plotting F1 against F2 places your vowel in the classic vowel space, and the nearest reference vowel is your closest match. Everything runs live on your device; nothing is recorded.
LPC is an estimate, not a measurement. The number of resonances it finds depends on the model order and your sample rate, and it can miss or merge formants on breathy, nasal, or quiet sounds. The reference vowels are adult-average values — your absolute formants scale with vocal-tract length, so a child’s or higher voice will read higher than the chart. Use sustained, clear vowels for the steadiest readings, and treat the vowel guess as a rough indicator.