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Tyco 579-769 Chapter, Emergency Voice/Alarm Communications Systems, Topic, See Page #

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Chapter 4 Emergency Voice/Alarm Communications Systems

Introduction

In this Chapter

An emergency voice/alarm communications system is designed to provide a highly reliable voice reinforcement and distribution network. These systems must deliver messages to building occupants for evacuation in an organized and safe manner. The system can deliver recorded messages automatically before emergency personnel arrive at the scene, and alarm paging systems can also be used to deliver live spoken messages from the emergency personnel to the occupants.

Refer to the page number listed in this table for information on a specific topic:

Topic	See Page #
A Typical Emergency Voice/Alarm Communications System	4-2
Parts of an Emergency Voice/Alarm Communications System	4-3

4-1

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Tyco 579-769 specifications Chapter, Emergency Voice/Alarm Communications Systems, Topic, See Page #

Contents

Fire Alarm Audio Applications Guide Guideline for Designing Emergency Voice/AlarmCommunications Systems for Speech Intelligibility 579-769Rev. CPage Copyrights and Trademarks Page Chapter 3 Speech Intelligibility Table of ContentsChapter 1 Speech Intelligibility Overview Chapter 2 Background InformationChapter 6 Speaker System Design Method Chapter 5 Regulatory IssuesChapter 7 Glossary of Terms Related Publications Chapter Speech Intelligibility Overview TopicSee Page # Intelligibility Speech Intelligibility Importance Designing forChapter Background Information TopicSee Page # Basic Audio Math Equation 2-3.Power RelationshipsV = I ⋅ R P = V ⋅Basic Audio Math, Continued = 20log⎜20⋅10−6 The Relationship Between Sound and Hearing Sound and HearingThe Nature of Speech IntroductionConsonants and Vowels Introduction Reverberation Room AcousticsRoom Acoustics, Continued Room Acoustics, Continued • Increasing the Signal-to-NoiseRatioEquation 2-8.The Inverse Square Law Figure 2-3.dB and Distance ChartSpeaker Basics ⎝ D2⎡Dr⎤ Speaker Basics, ContinuedSPL = Sensitivity + 20 log Equation 2-9. On-AxisSPL Calculation6dB/division SimplexCeiling Mount Speaker 1− cos ⎜Figure 2-5.Speaker Coverage Figure 2-6.Maximum Theoretical Coverage AngleSpeaker Basics, Continued + Distance Loss Angle Off-AxisθPolar Loss 0.0 dBCoverage Equation 2-11.Coverage Area CalculationsListener Height = 5 Feet CeilingMinimum Overlap Table 2-2.Layout Pattern Selection GuideTable 2-3.SPL Variation by Layout Pattern 2x Edge-to-EdgeDistributed Wall Mounted Systems Room Distributed Wall Mounted Systems, ContinuedFigure 2-8.Wall Mount Speaker Coverage Pattern Wall Mounted Speakers In FeetDistributed Wall Mounted Systems, Continued Edge-edge Minimum-Overlap Full-OverlapInfluences and Intelligibility Chapter Speech IntelligibilityTopic See Page #Influences on Intelligibility Influences on Intelligibility, Continued No NoiseWith Added Noise Continued on next page Influences on Intelligibility, ContinuedInfluences on Intelligibility, Continued DistortionMicrophone Technique FAIR Measures of IntelligibilityEXCELLENT GOODMeasures of Intelligibility, Continued Practical Measurement of Intelligibility STI-CISAnalyzerTalkbox Introduction Acoustical Modeling Software Tools for Predicting IntelligibilityPage See Page # Emergency Voice/Alarm Communications SystemsChapter Topic• Supervision of All Critical Signal Paths Advantages• Backup Power Source Batteries or Generator Dedicated Power Feed•A dedicated master microphone Figure 4-2.Class A and B Speaker Circuit Wiring Chapter Regulatory Issues TopicSee Page # Audibility From NFPA 72, 2002 EditionFrom NFPA 72, 2002 Edition High Background Noise Large Areas Audibility, ContinuedIntelligibility From NFPA 72, 2002 Edition Intelligibility, ContinuedPage Design Method Chapter Speaker System Design MethodTopic See Page #Speaker Design Method of the tone with respect to the speech signal Ceiling = Applying the MethodsFigure 6-1.iTool Office Space Example Flooring =Continued on next page Applying the Methods, ContinuedFigure 6-2.Office Space Speaker Location Guide Figure 6-3.Office Space SPL DistributionFlooring = Figure 6-5.Corridor Design ExampleDimensions = Applying the Methods, ContinuedResults and Coverage Information Figure 6-6.Corridor Speaker Location GuideFigure 6-7.Corridor SPL Distribution Figure 6-8.Corridor Reverberation TimeFlooring = Figure 6-9.iTool Gymnasium ExampleDimensions = Applying the Methods, ContinuedApplying the Methods, Continued Figure 6-10.Gymnasium Speaker Location GuideFigure 6-11.Gymnasium SPL Distribution Figure 6-12.Gymnasium Reverberation Time ResultsFigure 6-13.Lobby Example Figure 6-14.Lobby ExampleApplying the Methods, Continued Applying the Methods, Continued Figure 6-15.Lobby LayoutFigure 6-16.Lobby Speaker Location Guide Figure 6-17.Lobby SPL DistributionLobby, continued Applying the Methods, ContinuedIn Closing ConclusionPage Glossary Chapter Glossary of TermsTopic See Page #Glossary or Terms GlossaryGlossary, Continued Page Index Page Page 579-769Rev. C