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FOREWORD TO ENGLISH EDITION
THE STATISTICAL THEORY OF ROOM ACOUSTICS
THE GEOMETRICAL THEORIES OF ROOM ACOUSTICS
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absorption coefficient acoustic conditions acoustic feedback acoustic impedance acoustic properties acoustic ratio angle angle of incidence aperture auditoria axial calculated ceiling characteristic frequencies cinema auditorium coefficient of absorption coefficient of sound construction decay curve decay of sound defined delay dependence determine diagram diffuse dimensions directional characteristic distance distributed electro-acoustic equation expression factor feedback formula frequency characteristic graph grid hall image sources increase large number layer length loudness loudspeaker low frequencies mean coefficient measurements method microphone mineral wool music studios noise level number of reflections obtained optimum reverberation porous material radiator rays reduction reflected energy secondary enclosure shown in Fig sound absorbent materials sound absorption sound amplification system sound energy sound field sound insulation sound pressure sound reproduction sound source sound transmission sound wave speech standing waves stereophonic sound surfaces thick tion total absorption vibratory system volume wall