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THE NATURE OF NOISE
SOME SPECIFIC ACOUSTIC DEFECTS
THE SPECIAL CASE OF WALLS
11 other sections not shown
absorption coefficient acoustic treatment air space air-borne noise air-borne sound applied approximately auditorium average balcony calculated cavity cavity wall ceiling Chapter cinema theatre common compliance compression concrete cork coupling cross-section curve cycles per second damped decay decibels discontinuity duct edges eelgrass effect efficiency electrical ELSTREE STUDIOS felt fibre board flanking transmission floating floor frame frequency range greater high frequencies hinge impact noises increase insulation values intensity isolated layer load low frequencies Low Pass Filter mass maximum measured method minimum monaural motor MOUNTING ISOLATOR noisy pads panels partition path performance phons plaster practice ratio reduce reflection resonant frequency rock wool covered rubber seal shown in Fig side walls sill SLIDING DOOR soffit sound-absorbing material soundproof sources of vibration splitters stiffness structural floor studding surfaces thick tion total absorption usually VARIATION OF ABSORPTION volume wave transmission window