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absorption coefficient amplitude analysis angle approximation array attenuation average Beijing calculated calibrated characteristic chime bells Chinese components compression coupling creeping waves crystal curve diffraction direction disk echo effect electric energy equation experimental results expressed focused gain function group velocity high intensity sound Hilbert transform IEEE incident inertia coupling Institute of Acoustics interface layer linear liquid-filled sphere loudspeaker low frequency matrix maximum measured metal stud method microphone Monte Carlo method naphthalene noise obtained paper parameters phase piezoelectric piezoelectric-tunable plate prediction pressure wave pulse range ratio received region resonance frequency respectively reverberation safety criterion samples secondary source system shown in Fig sidelobe signal separation Sinica sound field sound pressure level sound reinforcing system sound source sound wave SPL of speech stress surface Table target temperature theoretical theory thickness tion transducer transform ultrasonic velocity vibration voltage width