Acoustic Voice Analysisfor Speech-Language Pathologists
Objective voice measurements for clinicians, voice teachers, and vocal professionals
No sign-up required for the voice check
Built for Clinical Workflow
Research-Validated Accuracy
All measurements validated against Praat, the gold standard in voice research. Built on algorithms from peer-reviewed publications with documented accuracy.
Works with Any Recording
No format conversion needed. Upload recordings directly from smartphones, tablets, or professional equipment. Supports WAV, MP3, M4A and many more formats.
Professional PDF Reports
Generate comprehensive reports instantly. Perfect for clinical documentation, insurance purposes, and sharing with referring physicians.
Cloud-Based & Accessible
Access from any device, anywhere. No expensive software to install or maintain. Suitable for telehealth sessions and on-the-go assessments.
Evidence-Based Analysis
Every measure uses peer-reviewed algorithms validated against clinical standards—the same methods trusted in published voice research. New tools added continuously as the science evolves.
HIPAA Aware by Design
Built to minimize exposure to protected health information. Patient identifiers and analysis results are not stored on our servers. Designed for privacy-sensitive clinical workflows.
Professional Acoustic Analysis Tools
Research-grade measurements for clinical documentation and workflow support
Voice Analyzer
Comprehensive acoustic measurements including F0, jitter, shimmer, HNR, and CPPS. Upload audio and get instant results with professional reports.
- • F0, Jitter, Shimmer, HNR, CPPS
- • Normative data comparison
- • Instant PDF reports
Pitch Visualizer
Real-time pitch visualization with gender perception ranges. Ideal for voice therapy documentation and gender-affirming voice work.
- • Real-time pitch tracking
- • Gender perception ranges
- • Musical scale reference
- • F3 Gender Assessment
AVQI & ABI Calculator
Free web-based AVQI and ABI calculator. Multiparametric voice quality assessment validated for Brazilian Portuguese (Englert 2021).
- • AVQI (Acoustic Voice Quality Index)
- • ABI (Acoustic Breathiness Index)
- • Validated cutoff values
Spectrogram
Generate wideband and narrowband spectrograms with aligned waveforms. Visualize formants, harmonics, and voice quality patterns.
- • Wideband (formant analysis)
- • Narrowband (harmonic analysis)
- • PDF reports with both views
MPT & DSI
Measure Maximum Phonation Time and calculate Dysphonia Severity Index using the validated Wuyts et al. (2000) protocol.
- • Maximum Phonation Time
- • Dysphonia Severity Index
- • Component breakdown
Spectral Analysis
Analyze spectral voice characteristics including LTAS, Alpha Ratio, and CSID using validated clinical protocols.
- • Long-Term Average Spectrum
- • Alpha Ratio (spectral tilt)
- • CSID (Awan & Roy, 2012)
Important: For Clinical Documentation Only
PhonaLab provides acoustic measurements for educational and clinical documentation purposes only. It does not diagnose voice disorders or provide medical advice. All clinical decisions must be made by licensed healthcare professionals. Results should be interpreted in conjunction with comprehensive clinical evaluation.
Built by a Voice Researcher, for Clinicians
PhonaLab was created by Dr. Jorge C. Lucero, a computer science professor at the University of Brasília with over 30 years of research in voice and speech production.
Throughout his career, Dr. Lucero has developed mathematical models of vocal fold dynamics and clinical analysis tools for voice disorder assessment—bridging fundamental research with practical applications that serve speech-language pathologists and voice clinicians worldwide.
PhonaLab reflects a simple conviction: clinicians deserve access to the same rigorous acoustic tools used in research—without the complexity or cost of traditional software.
Credentials
- Professor, University of Brasília (Computer Science)
- 30+ years researching voice and speech production
- 50+ peer-reviewed publications on voice science
- Collaborations with leading voice centers across 4 continents
- Award-winning research on voice simulation
- CNPq (Brazil) research fellow in biomedical engineering
Why PhonaLab?
- Research-validated algorithms matching Praat accuracy
- No format conversion needed - accepts smartphone recordings
- Instant PDF reports for professional documentation
- New tools and measures added continuously
- AI-assisted development