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Nature of Sound
The Behaviour of Sound in Rooms
The Design of Rooms for Speech
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above absorbent absorption coefficient acoustic acoustic filters acoustic shadow acoustic treatment air-borne sound insulation air-cracks amount apron stage arithmetic mean ARTIFICIAL ECHO attenuation audience audiometry auditorium average bitumen building calculated cardioid cavity resonator ceiling centimetres clinker column Concrete floor continuity suite decibels direct sound distance ditions duct dyn/cm2 echo effect Eustachian tube example flat floating floor floating wood floor finish foot units frequency frequency response front-to-back ratio given glass wool Grade II grazing incidence Haas effect hall hearing loss Helmholtz Resonator high frequencies However impact sound intensity inverse square law Jet Engine Joist floor lb per sq less light-framed construction line source linoleum listener loudness loudspeaker low-frequency material measured microphone milliseconds mineral wool noise level noise measurements noise source nomogram normal octave band open-circuit voltage orchestra ossicles otosclerosis overall insulation panel partition party wall path perforated hardboard phons plasterboard plastered position possible practical proscenium arch pugging quilt radiate raft range receiving room reduce reflecting resilient resonance resonant frequency reverberant level reverberant room reverberant sound level ribbon microphone rock wool roofing felt room acoustics Royal Festival Hall Royal Opera House S. S. Stevens sabins Salisbury Cathedral screed seat shown in Fig side soffit solid sound films Sound Level Meter sound pressure sound pressure levels sound waves space speaker speech Speech Interference speech-reinforcement standing waves studio surfaces suspended ceiling television studios thick Thus tion tongued and grooved Transept usually values vibration voltage wall wavelength waves wind gradient