STIPA - Speech Intelligibility

The professional choice for NFPA 72 and IEC 60268-16 compliance testing. Measure speech intelligibility of PA systems, fire alarms, and classroom audio with accuracy.

STIPA is the professional speech intelligibility measurement tool trusted by audio engineers, fire safety professionals, and acoustic consultants worldwide. Fully compliant with IEC 60268-16:2011 standards, STIPA delivers laboratory-grade accuracy in a portable iOS app.

PROFESSIONAL STI MEASUREMENT

Accurately measure the Speech Transmission Index of any public address system, voice evacuation system, or audio installation. STIPA uses the standardized modulation transfer function method across seven octave bands to deliver results you can trust for compliance documentation and system optimization.

COMPLIANCE READY

Meet the requirements of critical industry standards:

• IEC 60268-16:2011 Speech Transmission Index measurement
• NFPA 72 voice intelligibility requirements for fire alarm systems
• ANSI/ASA S12.60 classroom acoustics verification
• ADA accessibility compliance for educational facilities

PROFESSIONAL FEATURES

Real-Time Analysis

• Live STI value with IEC qualification display
• Seven octave band level monitoring (125Hz to 8kHz)
• Modulation index visualization for each frequency band
• Signal quality indicators for measurement confidence

Comprehensive Reporting

• Generate professional PDF reports for client documentation
• Export data in CSV format for further analysis
• JSON export for system integration
• Include location names, notes, and timestamps

Measurement Flexibility

• Support for external calibrated microphones
• Adjustable measurement duration for various environments
• Built-in STIPA test signal generator
• Works with any PA system or audio source

Data Management

• Save unlimited measurements with searchable history
• Compare results across locations and time
• Track system performance over multiple visits
• Statistics dashboard for trend analysis

WHO USES STIPA

Fire Safety Professionals Test voice evacuation systems and emergency communication systems for NFPA 72 compliance. Document speech intelligibility across all acoustically distinguishable spaces.

AV Integrators Commission PA systems with confidence. Verify speech clarity meets client specifications and industry benchmarks. Troubleshoot problem areas with octave band analysis.

Acoustic Consultants Assess room acoustics and their impact on speech transmission. Identify reverberation and noise issues affecting intelligibility. Provide quantitative data for remediation recommendations.

Educational Facility Managers Ensure classroom audio systems meet ANSI S12.60 requirements. Document ADA compliance for hearing accessibility. Optimize learning environments with data-driven decisions.

Houses of Worship Verify sermon intelligibility throughout the sanctuary. Optimize sound system performance for clear communication. Ensure all congregants can hear spoken content clearly.

UNDERSTANDING STI RESULTS

• Excellent (0.75-1.00): Outstanding speech clarity
• Good (0.60-0.75): Clear and intelligible speech
• Fair (0.45-0.60): Acceptable with some difficulty
• Poor (0.30-0.45): Speech understanding is strained
• Bad (0.00-0.30): Speech is largely unintelligible

TECHNICAL SPECIFICATIONS

• Sample Rate: 48kHz
• Frequency Range: 125Hz - 8kHz (7 octave bands)
• Modulation Frequencies: 14 per IEC 60268-16
• Measurement Duration: 10-60 seconds configurable
• External Microphone Support: Lightning and USB-C audio interfaces

SUBSCRIPTION OPTIONS

STIPA offers flexible options for every professional need:

• Monthly subscription for project-based work
• Annual subscription for ongoing testing requirements
• Lifetime purchase for permanent access

Download STIPA today and bring professional speech intelligibility testing to every job site.

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