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DANC Dai-Dan Active Noise Control System: Introduction Examples
A certain Cinema Complex
The system was applied to a duct of an inlet air system for each of ten large or small screen rooms of a large movie theater.
Location Fukuoka
Completion November 2000
Outline of building Five-story steel-frame building
Total floor space 21100.1 m2
Intended use of building Ten screen rooms
Number of seats 119 to 412 seats
Noise control value NC-30 (Target: 25)
Elbow-type DANC was used to cope with severe installation conditions of the ducts in the machine room.
Though active noise control system is normally installed to the straight ducts because of linearity of sound wave transmission, use of elbow-type DANC which angles in the middle was enabled through investigation of microphone and speaker installation positions.
Photograph of Elbow-type DANC
 
Photograph of DANC control box
 
< Effects >
The above graph shows data obtained inside the duct in the downstream of the DANC system. It shows the efficiency in a range between 80 to 300 Hz.


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