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absorption coefficient acoustic intensity acoustique Acustica amplitude angle applied approximately attenuation attenuation constant average beam boundary calculated components concert halls configuration constant correlation coupling curve d'une dB(A density diffusion displacement distance distribution effect elastic energy equation estimated evaluation excitation experimental factor Fig.l Figure filter frequency Gaussian beam impedance impulse response incidence input intensity linear loudspeaker matrix measured method méthode microphone modal mode modulation Modulation Transfer Function noise normal obtained octave band output panel parameters phase phonon plane plate predicted propagation pulse radiation range RASTI ratio reflection resonance reverberation room acoustics seats shown shows signal simulation sound field sound level sound pressure sound reinforcement system sound source sound transmission spatial spectrum speech intelligibility Speech Transmission Index structure surface technique temperature theoretical tion transducer ultrasonic ultrasound values velocity vibration wall wave