MuzicăWhat actually happens, technically, when you submit a track
The analysis combines objective acoustic measurements with a classification model calibrated on an internal reference set, based on phisiological effect frequency selection, to determine the track's dominant emotional state and how close it is to its ideal state profile.
Measured parameters
Tempo (BPM)
Track speed, detected directly from the waveform.
Key
The dominant tonal center (major/minor and note).
Energy (RMS)
Perceived energy level, on a 1-10 scale.
Valence
How positive/negative the track's emotional "coloring" is.
Arousal
The induced physiological activation level (low → very high).
Spectral centroid
How "bright" or "dark" the overall timbre is.
Harmonic ratio
The proportion of sustained tonal content vs. percussive/noisy content.
Rhythm complexity
The variability and density of rhythmic patterns.
The 9 emotional states we measure
Classification happens on a valence/arousal map, calibrated on more than 10,000 of previously analyzed soundtracks.
Sadness
Low valence, low arousal — melancholic, introspective sadness, without active tension.
Anxiety
Low valence, high arousal — tension, restlessness, an unpleasant state of alertness.
Acute stress
Low valence, very high arousal — sudden alarm, hypervigilance, a startle-reflex response to an acute stressor.
Chronic stress
Low-to-moderate valence, medium arousal — sustained background tension, exhaustion with irritability.
Panic
Very low valence, maximum arousal — acute crisis, disorientation, extreme physiological activation.
Energizing
High valence, high arousal — energy, motivation, intense positive activation.
Happiness
Very high valence, moderately high arousal — warm joy, contentment, a sustained positive state.
Relaxation
Moderately high valence, low-to-moderate arousal — composed calm, quiet mental clarity, stability and centeredness.
Deep sleep
Moderately high valence, very low arousal — deep exhaustion, a strong pull toward rest.
The conformity score
The certificate includes a conformity score (0-100), showing how close the track is to the ideal acoustic profile of its identified state. A high score confirms the track is well-suited for its declared use (e.g. relaxation in a spa, focus in an office, energizing in a gym).