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Tyco 579-769 specifications Applying the Methods, Continued, Lobby, continued

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Applying the Methods, Continued

Example 4:	The following screen shows the reverberation time and speaker coverage information:
Lobby, (continued)

Figure 6-18. Lobby Reverberation Time and Speaker Coverage Information

6-12

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Tyco 579-769 specifications Applying the Methods, Continued, Lobby, continued

Contents

Guideline for Designing Emergency Voice/Alarm Communications Systems for Speech Intelligibility579-769Rev. C Fire Alarm Audio Applications GuidePage Copyrights and Trademarks Page Table of Contents Chapter 1 Speech Intelligibility OverviewChapter 2 Background Information Chapter 3 Speech IntelligibilityChapter 5 Regulatory Issues Chapter 6 Speaker System Design MethodChapter 7 Glossary of Terms Related Publications Chapter Speech Intelligibility Overview TopicSee Page # Speech Intelligibility Importance Designing for IntelligibilityChapter Background Information TopicSee Page # Equation 2-3.Power Relationships V = I ⋅ RP = V ⋅ Basic Audio MathBasic Audio Math, Continued = 20log⎜20⋅10−6 Sound and Hearing The Relationship Between Sound and HearingThe Nature of Speech IntroductionConsonants and Vowels Room Acoustics Introduction ReverberationRoom Acoustics, Continued • Increasing the Signal-to-NoiseRatio Room Acoustics, ContinuedFigure 2-3.dB and Distance Chart Speaker Basics⎝ D2 Equation 2-8.The Inverse Square LawSpeaker Basics, Continued SPL = Sensitivity + 20 logEquation 2-9. On-AxisSPL Calculation ⎡Dr⎤Simplex Ceiling Mount Speaker1− cos ⎜ 6dB/divisionFigure 2-5.Speaker Coverage Figure 2-6.Maximum Theoretical Coverage AngleSpeaker Basics, Continued Angle Off-Axisθ Polar Loss0.0 dB + Distance LossEquation 2-11.Coverage Area Calculations Listener Height = 5 FeetCeiling CoverageTable 2-2.Layout Pattern Selection Guide Table 2-3.SPL Variation by Layout Pattern2x Edge-to-Edge Minimum OverlapDistributed Wall Mounted Systems Distributed Wall Mounted Systems, Continued Figure 2-8.Wall Mount Speaker Coverage PatternWall Mounted Speakers In Feet RoomEdge-edge Minimum-Overlap Full-Overlap Distributed Wall Mounted Systems, ContinuedChapter Speech Intelligibility TopicSee Page # Influences and IntelligibilityInfluences on Intelligibility Influences on Intelligibility, Continued No NoiseWith Added Noise Influences on Intelligibility, Continued Continued on next pageInfluences on Intelligibility, Continued DistortionMicrophone Technique Measures of Intelligibility EXCELLENTGOOD FAIRMeasures of Intelligibility, Continued Practical Measurement of Intelligibility STI-CISAnalyzerTalkbox Tools for Predicting Intelligibility Introduction Acoustical Modeling SoftwarePage Emergency Voice/Alarm Communications Systems ChapterTopic See Page #Advantages • Backup Power Source Batteries or GeneratorDedicated Power Feed • Supervision of All Critical Signal Paths•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 Audibility, Continued High Background Noise Large AreasIntelligibility Intelligibility, Continued From NFPA 72, 2002 EditionPage Chapter Speaker System Design Method TopicSee Page # Design MethodSpeaker Design Method of the tone with respect to the speech signal Applying the Methods Figure 6-1.iTool Office Space ExampleFlooring = Ceiling =Applying the Methods, Continued Figure 6-2.Office Space Speaker Location GuideFigure 6-3.Office Space SPL Distribution Continued on next pageFigure 6-5.Corridor Design Example Dimensions =Applying the Methods, Continued Flooring =Figure 6-6.Corridor Speaker Location Guide Figure 6-7.Corridor SPL DistributionFigure 6-8.Corridor Reverberation Time Results and Coverage InformationFigure 6-9.iTool Gymnasium Example Dimensions =Applying the Methods, Continued Flooring =Figure 6-10.Gymnasium Speaker Location Guide Figure 6-11.Gymnasium SPL DistributionFigure 6-12.Gymnasium Reverberation Time Results Applying the Methods, ContinuedFigure 6-13.Lobby Example Figure 6-14.Lobby ExampleApplying the Methods, Continued Figure 6-15.Lobby Layout Figure 6-16.Lobby Speaker Location GuideFigure 6-17.Lobby SPL Distribution Applying the Methods, ContinuedApplying the Methods, Continued Lobby, continuedConclusion In ClosingPage Chapter Glossary of Terms TopicSee Page # GlossaryGlossary Glossary or TermsGlossary, Continued Page Index Page Page 579-769Rev. C