Abstract: The real drum trigger monitor and amplified tone module is an electronic percussion instrument, satisfying the desire of drummers to have realistic electronic drums with the audible drum sound coming directly from the instrument triggering the sound being heard. The monitor has a speaker subsystem and patch capability mounted within an actual acoustic drum shell having a mesh drumhead and electronic trigger. The output of the electronic trigger is fed into an industry recognized tone processor before being fed back to the integrated speaker sub-system mounted in the drum, thereby producing sound coming directly from the drum activating the electronic signal. Alternatively, a traditional electronic percussion instrument may be mounted to the real drum trigger monitor and amplified tone module to provide an integrated drum trigger and speaker monitor.

Abstract: Provided is an arm structure for a robot which can favorably carry out jobs which are typically performed by humans. By determining the length of the arm and the height of the axis of rotation of the arm in such a manner that a range of rotational motion of the arm in accessing the region can be covered by a range in which the fore-and-aft distance to the tip of the arm can be linearly approximated, even though the trajectory of the arm is approximated by a line, the error in the distance to the object can be limited within a prescribed range, and the practicality and economy of computation can be achieved at the same time.