Building & Architectural Acoustics Building & Architectural Acoustics

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Reverberation Time and Absorption V T 0. 161 A T is Reverberation Time - Sound decay in seconds to 1/1000 level (-60dB) V is the Volume of the Room (m 3 ) A is the Total Absorption Area (m 2 ) Wallace Clement Sabine (June 13, 1868 - January 10, 1919) www.bksv.com, 11 Optimum Reverberation Times CNRC www.bksv.com, 12 6
What makes a Good Listening Room • Steep Early Decay Curve – Maintains clarity • Early reflections – +/- 60 degree – Horizontal • Minimize ceiling reflections • Side Wall reflections – Discreet – Lateral • Eliminate – Discrete echoes – Flutter – Standing Waves s 1 0.9 0.8 0.7 0.6 0 0.4 0.8 1.2 1.6 2 2.4 2.8 3.2 3.6 s 0.5 0.4 0.3 0.2 0.1 S1R1 T2 Average 250 125 500 1k 2k dB 80 60 40 20 0 4k Hz 0 125 250 500 1k 2k 4k Hz www.bksv.com, 13 Factors Influencing Speech Intelligibility • Word Material and Presentation • Character of the Speaker • Quality of the Transmission System • Character of the <strong>Acoustics</strong> • Character of the Listener www.bksv.com, 14 7
Page 1 and 2: Building & Architectural Acoustics
Page 3 and 4: Interior Sound Levels • A-weighte
Page 5: Now ready, set, go! Reverberation!
Page 9 and 10: Let’s try a simple measurement wi
Page 11 and 12: Impulse - Pistol Shot Time www.bksv
Page 13 and 14: Impulse Response the natural way Pr
Page 15 and 16: What is DIRAC • Dual Input Room
Page 17 and 18: Room Acoustic Standards • Room Pa
Page 19 and 20: Room Acoustic Parameters - Graphs (
Page 21 and 22: 3D Graphs - CSD Spectrogram (Time S
Page 23 and 24: Calculated Results - Measurement Pa
Page 25 and 26: Tools to improve your room acoustic
Page 27 and 28: ODEON Results - Auralization Flutte
Page 29 and 30: ODEON School Project Original Acous
Page 31 and 32: A bit of terminology • Noise redu
Page 33 and 34: Cavity Resonances www.bksv.com, 65
Page 35 and 36: Isolation Between Spaces • Regula
Page 37 and 38: Airborne Sound Insulation - Measure
Page 39 and 40: Instrument Requirements Investigato
Page 41 and 42: New for Euronoise 2009 • Introduc
Page 43 and 44: BZ5503 - Archive results as normal
Page 45 and 46: Combine Results www.bksv.com, 89 Ex
Page 47 and 48: Let’s take a tour… www.bksv.com

Building & Architectural Acoustics Building & Architectural Acoustics

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