Method and structure for position detection

(canceled)

A device having first and second members capable of moving relative to each other, the device able to determine the relative motion of the at least two parts, comprising:

• a first member having thereon a set of one or more excitatory elements;
• a second member having thereon a set of one or more vibratory elements, each of the vibratory elements constructed to vibrate with approximately the same characteristic frequency spectrum;
• the first and second members configured such that relative movement between the first member and the second member triggers one of the one or more excitatory elements in the set to cause one of the vibratory elements in the set to vibrate, the one or more vibratory elements vibrating with the same characteristic frequency spectrum.

A joint, comprising first and second members, wherein the first member comprises first and second reeds, wherein the second member comprises a multiplicity of teeth, wherein the multiplicity of teeth is positioned so that teeth from the multiplicity of teeth contact the first and second reeds during relative motion between the first and second members, wherein during relative motion between the first and second members, the first reed generates a first vibration signal with a first characteristic frequency spectrum induced by release of contact with a tooth in the multiplicity of teeth and the second reed generates a second vibration signal with a second characteristic frequency spectrum induced by release of contact with a tooth in the multiplicity of teeth, and wherein a timing difference between the first and second vibration signals indicates the direction of motion of the moving member.

24-29. (canceled)