What This Tool Measures
LTAS (Long-Term Average Spectrum)
Averaged spectrum over the entire recording showing your voice's spectral "fingerprint." Helps visualize hyperfunctional patterns (elevated high frequencies).
Alpha Ratio (Spectral Tilt)
Ratio of energy below vs above 1000 Hz. Indicates pressed (more negative) vs breathy (more positive) phonation.
- > 0 dB: Breathy / Hypofunctional
- -5 to 0 dB: Normal
- -10 to -5 dB: Slightly pressed
- < -10 dB: Pressed / Hyperfunctional
CSID (Cepstral/Spectral Index of Dysphonia)
Multiparametric index using CPP and L/H spectral ratio (Awan et al., 2010). For connected speech, variability measures (σCPP, σL/H) are included.
- < 10: Normal
- 10-30: Mild dysphonia
- 30-50: Moderate dysphonia
- > 50: Severe dysphonia
Recording Guidelines
Best: Connected Speech (20-30 seconds)
- • Reading passage (e.g., "Rainbow Passage")
- • Counting from 1 to 30
- • Natural conversation sample
- • Enables full CSID formula with variability
Also Accepted: Sustained Vowel (3-10 seconds)
- • Sustained /a/ at comfortable pitch
- • Uses simplified CSID formula
- • Good for quick screening
Drop your voice recording here
or click to browse
Supports: WAV, MP3, M4A and many more • Max: 50MB