Acoustic element

It is a speaker and ROTOSUB equipped with the motor drive rotor provided with the wing or braid modulated by the signal corresponding to [can adjust a pitch and] a desired sound in a pitch, especially the electrical signal. Especially the speaker rotor where it is [many] possible in very low frequency to rotate in each sound wave length can carry a lot of air, therefore can give big air pressure and sound pressure. This technology is based on generating of the sound wave by modulating the angle of a wing. In a low frequency wave, it is possible for a rotor to perform several rotations per 1 cycle signal which give the heightened pressure. Since the wing can do axial revolution at arbitrary angles, it can control pressure by a desired mode.