A sound encoding device enabling the amount of delay to be kept small and the distortion between frames to be mitigated. An intermittent stacking rim may be provided at the top of the drum to prevent overstacking of a plurality of such drums. The extension connector may further include a second connector that may be communicatively coupled to the first connector. The control electrode is formed on the second semiconductor layer between the first and second main electrodes. The dense intermediate body is reacted to produce a highly dense polycrystalline aluminum oxynitride body.