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NEMA SB 50:2008

NEMA SB 50:2008 Emergency Communications Audio Intelligibility Applications Guide Assists specifiers and Authorities Having Jurisdiction understand the concepts and terminology utilized to enhance intelligibility for emergency voice paging systems. Also provides an overview of issu

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Table of Contents

Foreword
Scope
Acknowledgment
Section1-SpeechIntelligibilityOverview
1.1Introduction
1.1.1ChaptersofThisPublication
1.2ImportanceofAudibleandIntelligibleEmergency
Communications
1.2.1SpeechIntelligibilityImportance
1.2.2DesigningforIntelligibility
Section2-BackgroundInformation
2.1Introduction
2.2BasicAudioMath
2.2.1Ohm'sLawandtheDecibel
2.2.2AddingDecibels
2.3SoundandHearing
2.3.1TheRelationshipbetweenSoundandHearing
2.4TheNatureofSpeech
2.4.1Introduction
2.4.2ConsonantsandVowels
2.5RoomAcoustics
2.5.1Introduction
2.5.2Reverberation
2.5.3EstimatingReverberationTimes
2.5.4CounteringtheEffectsofReverberation
2.6SpeakerBasics
2.6.1InverseSquareLaw
2.6.2Sensitivity
2.6.3SpeakerDispersionAngleand"Q"
2.6.4SpeakerCoverage
2.6.5DeterminingCriticalPolarAngle
2.6.6DeterminingCriticalPolarAngle
2.6.7PowerRating
2.6.8SpeakerLayouts
2.7DistributedWall-MountedSystems
2.7.1Introduction
2.7.2Advantages
2.7.3Disadvantages
2.7.4DesignofaDistributedWall-MountSystem
Section3-SPEECHINTELLIGIBILITY
3.1Introduction
3.2InfluencesonIntelligibility
3.2.1Introduction
3.2.2BackgroundNoise
3.2.3Reverberation
3.2.4Distortion
3.2.5MicrophoneTechnique
3.3MeasuresofIntelligibility
3.3.1DefiningIntelligibility
3.3.2MeasuringIntelligibility
3.3.3TheCommonIntelligibilityScale(CIS)
3.4RecommendationsforMaximizingSystemIntelligibility
3.4.1MaximizingIntelligibility
3.5Conclusion
3.5.1InClosing

Abstract

Assists specifiers and Authorities Having Jurisdiction understand the concepts and terminology utilized to enhance intelligibility for emergency voice paging systems. Also provides an overview of issues and general recommendations to enhance intelligibility.

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