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Tyco specifications Guideline for Designing Emergency Voice/Alarm, 579-769Rev. C

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Fire Alarm

Audio Applications Guide

Guideline for

Designing Emergency

Voice/Alarm

Communications

Systems for Speech

Intelligibility

579-769 Rev. C

Printed in the U.S.A. All specifications and other information shown were current as of publication, and are subject to change without notice.

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Tyco specifications Guideline for Designing Emergency Voice/Alarm, 579-769Rev. C, Fire Alarm Audio Applications Guide

Contents

Communications Systems for Speech Intelligibility Guideline for Designing Emergency Voice/Alarm579-769Rev. C Fire Alarm Audio Applications GuidePage Copyrights and Trademarks Page Chapter 1 Speech Intelligibility Overview Table of ContentsChapter 2 Background Information Chapter 3 Speech IntelligibilityChapter 6 Speaker System Design Method Chapter 5 Regulatory IssuesChapter 7 Glossary of Terms Related Publications Topic Chapter Speech Intelligibility OverviewSee Page # Intelligibility Speech Intelligibility Importance Designing forTopic Chapter Background InformationSee Page # V = I ⋅ R Equation 2-3.Power RelationshipsP = V ⋅ Basic Audio Math= 20log⎜ Basic Audio Math, Continued20⋅10−6 The Relationship Between Sound and Hearing Sound and HearingIntroduction The Nature of SpeechConsonants and Vowels Introduction Reverberation Room AcousticsRoom Acoustics, Continued Room Acoustics, Continued • Increasing the Signal-to-NoiseRatioSpeaker Basics Figure 2-3.dB and Distance Chart⎝ D2 Equation 2-8.The Inverse Square LawSPL = Sensitivity + 20 log Speaker Basics, ContinuedEquation 2-9. On-AxisSPL Calculation ⎡Dr⎤Ceiling Mount Speaker Simplex1− cos ⎜ 6dB/divisionFigure 2-6.Maximum Theoretical Coverage Angle Figure 2-5.Speaker CoverageSpeaker Basics, Continued Polar Loss Angle Off-Axisθ0.0 dB + Distance LossListener Height = 5 Feet Equation 2-11.Coverage Area CalculationsCeiling CoverageTable 2-3.SPL Variation by Layout Pattern Table 2-2.Layout Pattern Selection Guide2x Edge-to-Edge Minimum OverlapDistributed Wall Mounted Systems Figure 2-8.Wall Mount Speaker Coverage Pattern Distributed Wall Mounted Systems, ContinuedWall Mounted Speakers In Feet RoomDistributed Wall Mounted Systems, Continued Edge-edge Minimum-Overlap Full-OverlapTopic Chapter Speech IntelligibilitySee Page # Influences and IntelligibilityInfluences on Intelligibility No Noise Influences on Intelligibility, ContinuedWith Added Noise Continued on next page Influences on Intelligibility, ContinuedDistortion Influences on Intelligibility, ContinuedMicrophone Technique EXCELLENT Measures of IntelligibilityGOOD FAIRMeasures of Intelligibility, Continued STI-CISAnalyzer Practical Measurement of IntelligibilityTalkbox Introduction Acoustical Modeling Software Tools for Predicting IntelligibilityPage Chapter Emergency Voice/Alarm Communications SystemsTopic See Page #• Backup Power Source Batteries or Generator AdvantagesDedicated Power Feed • Supervision of All Critical Signal Paths•A dedicated master microphone Figure 4-2.Class A and B Speaker Circuit Wiring Topic Chapter Regulatory IssuesSee Page # From NFPA 72, 2002 Edition AudibilityFrom NFPA 72, 2002 Edition High Background Noise Large Areas Audibility, ContinuedIntelligibility From NFPA 72, 2002 Edition Intelligibility, ContinuedPage Topic Chapter Speaker System Design MethodSee Page # Design MethodSpeaker Design Method of the tone with respect to the speech signal Figure 6-1.iTool Office Space Example Applying the MethodsFlooring = Ceiling =Figure 6-2.Office Space Speaker Location Guide Applying the Methods, ContinuedFigure 6-3.Office Space SPL Distribution Continued on next pageDimensions = Figure 6-5.Corridor Design ExampleApplying the Methods, Continued Flooring =Figure 6-7.Corridor SPL Distribution Figure 6-6.Corridor Speaker Location GuideFigure 6-8.Corridor Reverberation Time Results and Coverage InformationDimensions = Figure 6-9.iTool Gymnasium ExampleApplying the Methods, Continued Flooring =Figure 6-11.Gymnasium SPL Distribution Figure 6-10.Gymnasium Speaker Location GuideFigure 6-12.Gymnasium Reverberation Time Results Applying the Methods, ContinuedFigure 6-14.Lobby Example Figure 6-13.Lobby ExampleApplying the Methods, Continued Figure 6-16.Lobby Speaker Location Guide Figure 6-15.Lobby LayoutFigure 6-17.Lobby SPL Distribution Applying the Methods, ContinuedLobby, continued Applying the Methods, ContinuedIn Closing ConclusionPage Topic Chapter Glossary of TermsSee Page # GlossaryGlossary or Terms GlossaryGlossary, Continued Page Index Page Page 579-769Rev. C