The comparative acoustic profile below illustrates the typical shifts in key voice parameters before and after voice therapy for puberphonia:
Key Acoustic Parameter Changes
* Fundamental Frequency (F_0): Drops substantially from an elevated falsetto baseline of around 220 Hz down into the normal adult male modal register (approx. 125 Hz).
* Jitter (Frequency Perturbation): Decreases significantly from 1.85% to 0.45%, reflecting stable cycle-to-cycle vocal fold vibration as excessive cricothyroid muscle tension is released.
* Shimmer (Amplitude Perturbation): Improves from 4.2% down to 1.6%, indicating smoother glottal closure and reduced breathiness or acoustic leakage.
* Cepstral Peak Prominence (CPP): Increases from 5.5 dB to 12.8 dB, representing a much cleaner, more resonant harmonic structure and clearer voice projection.
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