초록 ▼

An electronic drum has two or more batons, each baton having a transmitter which transmits a distinct radio frequency signal at a position in space. The electronic drum determines the current X, Y, and Z coordinates of each baton transmitter. To determine the position of each baton transmitter, the

An electronic drum has two or more batons, each baton having a transmitter which transmits a distinct radio frequency signal at a position in space. The electronic drum determines the current X, Y, and Z coordinates of each baton transmitter. To determine the position of each baton transmitter, the drum includes a tablet which has a flat support member at a predefined position, with at least two pairs of electrodes coupled to the flat support member. A first pair of the electrodes is shaped so that the amount of capacitive coupling between each baton transmitter and one of the first pair of electrodes corresponds to the position of the baton transmitter with respect to the X axis. A second pair of electrodes is shaped so that the amount of capacitive coupling between each baton transmitter and one of the second pair of electrodes corresponds to the position of the baton transmitter with respect to the Y axis. The electrodes pairs are shaped and positioned so that neither electrode pair shields the other, which allows for accurate X and Y position measurements. The drum also has a CPU which receives signals from the electrodes, and uses those signals to compute the X, Y and Z coordinates of each baton. The CPU also predicts when each baton transmitter will hit the drum\s flat support member and generates a signal at the predicted time so that a music synthesizer can generate a sound at the appropriate time.

대표청구항 ▼

A radio signal actuated position sensor, comprising: moveable positioning means for generating a radio frequency signal at a specified position in space, said position being specifiable with respect to X, Y and Z axes; antennae means comprising a flat support member with at least two pairs of electr

A radio signal actuated position sensor, comprising: moveable positioning means for generating a radio frequency signal at a specified position in space, said position being specifiable with respect to X, Y and Z axes; antennae means comprising a flat support member with at least two pairs of electrodes coupled to said flat support member, a first pair of said electrodes being shaped so that capacitive coupling between said moveable positioning means and said first electrode pair corresponds to the position of said moveable positioning means with respect to said X axis, and a second pair of said electrodes being shaped so that capacitive coupling between said moveable positioning means and said second electrode pair corresponds to the position of said moveable positioning means with respect to said Y axis; and computation means for receiving signals from said electrodes, for computing X and Y position values of said moveable positioning means, and for computing a Z position value which is inversely proportional to the sum of said received signals.