SILENCING DEVICE

PROBLEM TO BE SOLVED: To solve the problem that in the conventional silencing device, a space region where silencing effect is obtained and a space region where the silencing effect is not obtained, are produced. SOLUTION: Noise S1 from a noise source 1 is primarily diffracted by the upper-end edge...

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Hauptverfasser:	WATANABE IKUHISA, SUZUKI SHIGEO, ISHIKURA HIDEJI, SUGITA TOUKIYOKU
Format:	Patent
Sprache:	eng
Schlagworte:	ACOUSTICS ACOUSTICS NOT OTHERWISE PROVIDED FOR ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTIONOF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, ORTHE LIKE BUILDING CEILINGS CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES DEAF-AID SETS ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY FIXED CONSTRUCTIONS FLOORS GENERAL BUILDING CONSTRUCTIONS INSULATION OR OTHER PROTECTION OF BUILDINGS LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKEACOUSTIC ELECTROMECHANICAL TRANSDUCERS METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING,NOISE OR OTHER ACOUSTIC WAVES IN GENERAL MUSICAL INSTRUMENTS PHYSICS PUBLIC ADDRESS SYSTEMS ROOFS SOUND-PRODUCING DEVICES WALLS, e.g. PARTITIONS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To solve the problem that in the conventional silencing device, a space region where silencing effect is obtained and a space region where the silencing effect is not obtained, are produced. SOLUTION: Noise S1 from a noise source 1 is primarily diffracted by the upper-end edge 13a of an enclosure 13 to reach the opposite side of a soundproofing wall 12 from the noise source 16, and interferes with a control sound C from a speaker 14 to be reduced. The reduced sound is secondarily diffracted by the side 17a of a diffraction plate 17 and propagated to the side of the soundproofing wall 12 opposite to the noise source 16. Consequently, noise S1 interferes with the control sound C at a position 19 to be reduced and then propagated to the side of the soundproofing wall 12 opposite to the noise source 16. The sounds which are reduced by interfering with the control sound C are uniformly propagated. COPYRIGHT: (C)2005,JPO&NCIPI