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                   What is Sound?
       ・ The sound            ・ Longitudinal wave Transverse wave        ・ Loudness             ・ Audible range

                    Analog and digital
     ・ Analog vs Digital      ・ Binary       ・ A/D Conversion

                    Digital Sound
      ・ Cycle and Frequency         ・ Three elements of sound        ・ Basic wave            ・ 12 scale piano

                  What is voice?
     ・ Voice devising     ・ Formant frequency     ・ Experiment

                Decomposition of sound
        ・ Fourier transform         ・ Sound of industrial School           ・ Musical instrument      ・ Sound of club

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