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Physical Acoustics Nature of Sound
Nature of Hearing 72
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absorption coefficient absorptive material Acous acoustical design acoustical materials acoustical plaster amount of absorption amplifier amplitude approximately architectural acoustics audibility audience auditorium average balcony building cent church coefficients of sound-absorption cubic feet cycles per second decay of sound decibels determine diffraction echoes effect fibre board floor fork gypsum hair felt hall hearing of speech insulation insulation value intensity loud speaker mean free path measurements method microphone microwatts mineral wool music rooms Nashkote noise level optimal orchestra panel partitions quiet rear reduced reflected sound resonance reverberant room ripple tank satisfactory seats shape shown in Fig sound energy sound level sound waves sound-insulation source of sound speech and music speech articulation tests stage studios Table test room theatre thickness Tile tion transmission tuning fork V. O. Knud vibrations W. C. Sabine walls and ceiling wave length Wood studs