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The science

Grounded in clinical acoustics

Breath Vision listens the way pulmonologists do — reading the time-frequency shape of breath and voice, then translating it into plain language.

A single breath, unpacked
Time-frequency view
Inhale
Pause
Exhale
Adventitious
Signals we compute

Six signals

Breath rate
12–20 bpm
14

Cycles per minute at rest. Elevated rates can suggest exertion, anxiety or airway resistance.

Phonation time
15–25 s
16.2

How long you can sustain /a/ on one breath — a proxy for vital capacity and vocal control.

Vocal stability
> 90%
91

Steadiness of pitch and amplitude across sustained vowels — reflects laryngeal control.

DDK rate
5–7 syll/s
6.1

Rapid repetition of pa-ta-ka. Slower rates can indicate reduced articulatory coordination.

I : E ratio
1 : 1.5–2
1.9

Ratio of inspiration to expiration. Extended expiration can suggest obstructive patterns.

Cough character
Qualitative
72

Timbre and reflex quality of voluntary coughs, useful for surfacing wet vs. dry patterns.

Adventitious sounds

Four classes

Wheezes
Musical, whistling

Continuous, high-pitched sounds. Often associated with narrowed airways.

Crackles
Explosive, brief

Short discontinuous clicks. Fine crackles suggest small-airway reopening.

Stridor
Harsh, inspiratory

High-pitched, usually on inspiration. May suggest upper airway narrowing.

Rhonchi
Low, snoring

Low-pitched, continuous sounds. Often linked with mucus in larger airways.

Frequency map

Where each sound lives

Rhonchi100200 Hz
Voice fundamentals85300 Hz
Wheezes4001600 Hz
Crackles1002000 Hz
Stridor5001000 Hz
50 Hz2005001 kHz2 kHz
Cycle anatomy

The shape of a healthy breath

A resting cycle has a quick inhale, brief pause, and a longer controlled exhale — the timing itself is a clinical signal.

1.2 s
Inhale
0.3 s
Hold
1.8 s
Exhale
0.5 s
Rest

"Breath Vision produces wellness insights, not a diagnosis. Always consult a clinician for medical decisions."