The raw measurement of vocal pitch in Hertz (Hz) — the rate of vocal fold vibration. Forms the basis of the overall Pitch score.

• f0_hz: Average fundamental frequency of speech.
• f0_stability: Consistency of pitch over time (feeds Stability score).

Resonant frequencies of the vocal tract that shape vowel quality, clarity, and projection.

• f1_hz: First formant frequency.
• f2_hz: Second formant; used in Tone Brightness.
• f3_hz: Third formant frequency.
• f4_hz: Fourth formant frequency.
• fd_hz: Average distance between formants (articulation quality).

Ratio of periodic (clean) sound to noise (breathiness/hoarseness). Higher is clearer.

• hnr_db: HNR in decibels; contributes to Clarity.

Short‑term amplitude variation. Lower shimmer indicates smoother, more consistent volume.

• shimmer_db: Amplitude fluctuation in dB (Volume Consistency input).

Cycle‑to‑cycle pitch variation. Lower jitter sounds steadier and more controlled.

• jitter_percent: Pitch fluctuation percentage.

Moments where voicing stops or becomes unstable, often reflecting strain or hesitation.

• voice_breaks_percent: Portion of recording containing breaks.

Composite control/stability score combining multiple indicators.

• overall_confidence: 0–1 confidence of overall vocal control.

How consistent pitch remained across time.

• stability_confidence: 0–1 steadiness of pitch.

Reliability of clarity‑related measurements.

• clarity_confidence: 0–1 clarity quality estimate.

Overall delivery consistency across the recording.

• consistency_confidence: 0–1 temporal consistency.

Estimate of analysis reliability given audio conditions.

• measurement_reliability: 0–1 robustness of analysis.

Overall capture quality; higher is cleaner audio with fewer distortions.

• sample_quality: 0–1 audio quality indicator.