The present disclosure relates to a diaphragm that may be used with a mechanical-to-acoustical transducer. If a cell MC0, connected to a word line WL0L, is of a low resistance, current flowing through it is higher than that flowing in a dummy cell MR0, and hence a bit line SA_B is at a potential lower than that of a bit line SA_T. A microcontroller receives and analyzes the output of the impact sensor and generates a displayoutput message that is coupled to a display that is, for example, embodied on the golf practice mat to provide user shot-related feedback. The image forming apparatus is capable of transporting a paper favorably along a re-transporting path. The CPU accesses a comparative model from the angle database, and compares the angle queue with the comparative model to generate a plurality of comparative results. In one example, a single logical thread can speculatively use more than one physical thread, pending a selection of which physical thread should be committed.