MEASURING TECHNIQUE OF ACOUSTIC IMPEDANCE AND ACOUSTIC ABSORPTION COEFFICIENT

PROBLEM TO BE SOLVED: To provide a technique for measuring accurately the acoustic impedance and the acoustic absorption coefficient of a sample such as a building material in the installed state on a cite. SOLUTION: In this measuring technique of the acoustic impedance and the acoustic absorption c...

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Bibliographische Detailangaben
Hauptverfasser:	OZURU TORU, TOMIKI REIJI, TAKAHASHI YASUO
Format:	Patent
Sprache:	eng
Schlagworte:	ACOUSTICS ACOUSTICS NOT OTHERWISE PROVIDED FOR INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC ORINFRASONIC WAVES MEASURING METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING,NOISE OR OTHER ACOUSTIC WAVES IN GENERAL MUSICAL INSTRUMENTS PHYSICS SOUND-PRODUCING DEVICES TESTING
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a technique for measuring accurately the acoustic impedance and the acoustic absorption coefficient of a sample such as a building material in the installed state on a cite. SOLUTION: In this measuring technique of the acoustic impedance and the acoustic absorption coefficient for measuring accurately the acoustic impedance and the acoustic absorption coefficient of the material installed on the cite, the acoustic impedance and the acoustic absorption coefficient of the material are measured by utilizing a usually existing noise without using a sound source speaker. In a room where the usually existing noise level is low and measurement is difficult as it is, a random noise is outputted, and measurement is performed by improving diffusion of the sound in the room.