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absorbent material absorption coefficient absorption units achieve acoustic airborne sound amount amplitude attenuation audiometric beat frequency oscillator bending waves brick wall brickwork calibrator centre frequency Hz Concert Halls concrete construction corrected noise level criteria curve dB reduction decibels distance double glazed duct effect Example factory Frequency in Hz Grade grade curves hearing loss Helmholtz resonator Hz Fig impact sound insulation level in dB longitudinal wave loudness low frequency machine maximum measured method metres microphone mineral wool needed normal optimum panel partition perceived noise level phons plaster PNdB produced radiates receiving room reduction in dB reflections resonant frequency Sabine's formula scale shown in Fig solid backing sones sound insulation sound level meter sound power level sound pressure level sound reduction speech interference level standard surfaces Table thick third octave bandwidths threshold shift tion traffic transmission coefficient values velocity of sound vibration volume wavelength window