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Tyco 579-769 specifications

Models: 579-769

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Chapter Regulatory Issues How to

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Tyco 579-769 specifications

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Contents

Fire Alarm Audio Applications Guide Page Copyrights and Trademarks Page Table of Contents Emergency Voice/Alarm Communications Systems Glossary of Terms Related Publications Chapter Speech Intelligibility Overview Speech Intelligibility Importance Designing for Chapter Background Information Topic See Page # Equation 2-1. The Decibel Equation 2-3. Power RelationshipsBasic Audio Math Equation 2-2. Ohm’s Law Equation 2-5. dB and Sound Pressure Levels Equation 2-6. Adding Decibels Sound and Hearing Robinson and Dadson Equal Loudness Curves Nature of Speech Speech Pattern that Illustrates Modulations Room Acoustics Sabine Equation, used when α Eyring Equation, used when α Areas with high ceilings, specify a more directional speaker Speaker Basics Equation 2-8. The Inverse Square Law SPL = Sensitivity + 20 log Equation 2-9. On-Axis SPL Calculation Equation 2-10. Directivity Factor Q for a Conical Source 6dB/division87dB 51º 104 Critical Polar Angle Calculations Equation 2-11. Coverage Area Calculations Listener Height = 1.5 Meters Ceiling Coverage Diameter 2x Edge-to-Edge Layout Pattern Selection GuideSPL Variation by Layout Pattern Minimum Overlap Distributed Wall Mounted Systems Wall Mounted Speakers In Meters Room Coverage Width WidthOpposite Speaker Edge-edge Minimum-Overlap Full-Overlap Chapter Speech Intelligibility Influences on Intelligibility Frequency of Speech Contribution to Intelligibility Degradation of CIS vs. Signal-to-Noise Ratio No Noise With Added Noise Background Noise Reverberation Distortion ALcons Measures of IntelligibilityCorrelation of CIS and with STI and %ALcons STI method with faster measurement times Practical Measurement of Intelligibility STI-CIS Analyzer Talkbox Tools for Predicting Intelligibility Page Chapter Emergency Voice/Alarm Communications Systems Typical Emergency Voice/Alarm Communications System Advantages Parts of an Emergency Voice/Alarm Communications System Class a and B Speaker Circuit Wiring Chapter Regulatory Issues Audibility From Nfpa 72, 2002 Edition High Background Noise Large Areas Intelligibility Intelligibility Certification Page Chapter Speaker System Design Method Speaker Design Method Determine the speaker-to-listener distance D2 Recommendations for Maximizing System Intelligibility Applying the Methods ITool Office Space Example Office Space Speaker Location Guide Corridor Design Example Corridor Speaker Location Guide Corridor SPL Distribution ITool Gymnasium Example 10. Gymnasium Speaker Location Guide 13. Lobby Example 15. Lobby Layout Applying the Methods Conclusion Page Chapter Glossary of Terms Glossary Glossary Page Index IN-2 Page 579-769 Rev. C

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