Theory: Readings demonstrate the successful voltage based upon the standard value of samples around an entire quantity of intervals of the elemental frequency  Gi?i m?i (bao g?m t?t c? gi?i nào có s? thay ??i, c?p nh?t m?i ho?c ?i?u ch?nh) .) b?n l?u ý l?i nh?p li?u.