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Loudspeaker Array,Sound Column and Sound Girder

SHEN Yong(Institute of Acoustics,Nanjing University,Nanjing 210093,China)  
The concept of loudspeaker array,loudspeaker line array and sound column are introduced.Some basic characteristics such as directivity and ARF are introduced,sound columns of point sound source and line sound source are analyzed.The concept of sound girder is presented,and solution to achieve uniform sound field using quadratic residue sequence is provided.
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