What is sound?    Analog and difital     Digital Sound

       What is voice?    Decomposition of sound

       Update log             About US
   2014.12.22 Modify start     Team ID 170282
   2014.10.09 β version created  Team name Form of sound
   2014.9.01 Work start      Shimada Technical High School
   2014.7.24 Content Decision   Establishment 2014.7.02
   2014.7.02 Create Team       

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