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Design acoustics 34 and Materials Standards French Standards British
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A-weighted absorption coefficient airborne sound insulation ambient noise levels ANSI areas articulation index assessment ASTM attenuation auditoria band centre frequency British Standards Institution building cable ceiling centre frequency Hz concert halls construction criteria curves determination of sound Diagram direct sound distance duct ductwork effect enclosure engine environmental noise equipment example floor glass fibre industrial noise installation loudspeaker low frequency maximum metal method microphone Milton Keynes mineral wool noise control noise sources noise-sensitive normally octave band centre one-third octave band operation panels partition performance plant rooms plasterboard ratio reflections signal slab sound absorption sound insulation sound level difference sound level meters sound power levels sound pressure level sound reduction index sound reinforcement systems sound system space speech intelligibility structure studios surface Table testing transmission typically units values velocity ventilation noise vibration isolation wall