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1 Sound Waves and Sound Rays
2 Sound Reflections from Plane Surfaces
3 Curved Surfaces
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absorbing absorption coefficient according to eqn Acustica angle of incidence audience auditorium balcony Berlin Berlin Philharmonie ceiling concert halls corresponding criteria criterion decrease delay diffuse reflection direct sound distance distribution echo echogram effect energy density equation equivalent absorption area evaluation example exponential exponential decay factor analysis floor flow resistance formula free path Gauss-tones geometrical impulse response increase layer limit listener loudness level loudspeaker low frequencies mean free path means measured Meyer microphone noise orchestra plane plate porous possible propagation radiated ratio reason recording rectangular room reflector reverberation decay reverberation room room acoustics Sabine seats Section shown in Fig shows signal sound absorption sound energy sound field sound pressure sound pressure level sound rays sound reflections sound source sound waves speech stage statistical steady-state test persons test sample theaters tone verberation wall wavefront wavelength