Disclosed are methods, apparatuses, etc. This piezoelectric transformer 13A can be driven by properly switching first and second resonance modes different from each other. The mobile computing device converting the EMG signal to an action item of a game feature in an electronic game. The hardware apparatus may be an extension to the hardware address decode, that creates, in the physical memory address space of the node, an area of virtual memory that does not actually exist, and is therefore able to respond instantly to read and write requests from the processing elements. The systematic error, in contrast, may be controlled by changing the control parameters.