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PROPERTIES OF SOUND 1 The origin and propagation of sound
Sound intensity Sound energy Intensity level Sound pressure
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absorption coefficient plotted absorption units air space air-borne sound Architectural Acoustics attenuation average sound reduction average tapping level Broadcasting House building ceiling concert hall Copenhagen cork curve decibels decrease diffuse direct sound double wall ducts effective average tapping effective sound pressure effective tapping level equivalent loudness fibreboard floating floor frequency range give height Helmholtz resonator increase intensity level low frequencies mounted natural frequency normal modes number of absorption obtained octave panel partition placed plotted against frequency porous material possible pressure level difference rear wall receiving room reduction factor plotted reflected resilient material resonant frequency reverberation process reverberation time plotted Section shown in Fig shows slag wool slit solid sound absorbing material sound energy density sound field sound intensity sound intensity level sound level sound pressure level sound reduction factor sound source sound transmission sound waves structural floor studio surface thick velocity vibrations wave front wave-length wood-joist floor