Tyco 579-769 specifications Copyrights and Trademarks

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Copyrights and Trademarks

Copyrights

Trademarks

Copyright © 2005 Tyco Safety Products – Westminster.

All rights reserved.

All specifications and other information shown were current as of document revision date, and are subject to change without notice.

Printed in the United States of America.

Tyco, Simplex, and the Simplex logo are trademarks of Tyco International Services (AG) or its affiliates in the U.S. and/or other countries.

All other products are trademarks of their respective manufacturers. All registered and unregistered trademarks are the sole property of their respective companies.

Notice	This guide is intended as an informational resource and is not intended to provide definitive legal,
	engineering, design or architectural advice. Legal, engineering, design, or architectural
	requirements and interpretations may vary from jurisdiction to jurisdiction or project to project.
	Therefore, no warranty or representation is made about the sufficiency of any of the contents of
	this guide. Tyco Safety Products – Westminster, disclaims any and all liability for damages of any
	sort claimed to result from the use of this guide. This guide is distributed with no warranties
	whatsoever, including but not limited to, warranties of merchantability or fitness for a particular
	purpose. Readers with specific questions should consult the appropriate advisor.

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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 Topic See Page # Chapter Background InformationEquation 2-2. Ohm’s Law Equation 2-3. Power RelationshipsBasic Audio Math Equation 2-1. The DecibelEquation 2-6. Adding Decibels Equation 2-5. dB and Sound Pressure LevelsRobinson and Dadson Equal Loudness Curves Sound and HearingSpeech Pattern that Illustrates Modulations Nature of SpeechRoom Acoustics Eyring Equation, used when α Sabine Equation, used when αAreas with high ceilings, specify a more directional speaker Equation 2-8. The Inverse Square Law Speaker BasicsEquation 2-9. On-Axis SPL Calculation SPL = Sensitivity + 20 log6dB/division 87dBEquation 2-10. Directivity Factor Q for a Conical Source 51º Critical Polar Angle Calculations 104Listener Height = 1.5 Meters Ceiling Coverage Diameter Equation 2-11. Coverage Area CalculationsMinimum Overlap Layout Pattern Selection GuideSPL Variation by Layout Pattern 2x Edge-to-EdgeDistributed Wall Mounted Systems Width Opposite SpeakerWall Mounted Speakers In Meters Room Coverage Width Edge-edge Minimum-Overlap Full-Overlap Chapter Speech Intelligibility Frequency of Speech Contribution to Intelligibility Influences on IntelligibilityNo Noise With Added Noise Degradation of CIS vs. Signal-to-Noise RatioBackground Noise Reverberation Distortion Measures of Intelligibility Correlation of CIS and with STI and %ALconsALcons STI method with faster measurement times STI-CIS Analyzer Talkbox Practical Measurement of IntelligibilityTools for Predicting Intelligibility Page Chapter Emergency Voice/Alarm Communications Systems Advantages Typical Emergency Voice/Alarm Communications SystemParts of an Emergency Voice/Alarm Communications System Class a and B Speaker Circuit Wiring Chapter Regulatory Issues From Nfpa 72, 2002 Edition AudibilityHigh Background Noise Large Areas Intelligibility Intelligibility Certification Page Chapter Speaker System Design Method Determine the speaker-to-listener distance D2 Speaker Design MethodRecommendations for Maximizing System Intelligibility ITool Office Space Example Applying the MethodsOffice Space Speaker Location Guide Corridor Design Example Corridor SPL Distribution Corridor Speaker Location GuideITool 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