Patent ID: 7595444

Claim:
An electromagnetic transducer device, the device comprising: a core, the core being magnetically susceptible, the core being an elongated member having opposing ends that are linearly aligned in close proximity to define a substantially closed loop interrupted by a gap for passing a string, the core configurable to surround the string on at least three sides; a magnet, the magnet being proximate to the string and configurable to transfer magnetic flux to the string, the string being magnetically susceptible, and the string being configurable to transfer magnetic flux across the gap to each of the opposing ends of the core with at least a portion of magnetic flux lines from the string being substantially aligned along the linear path defined by the opposing ends of the core; and an electrically conductive coil, the coil being disposed about the core, the coil being configurable to produce current in response to the magnetic flux from the core, wherein mechanical vibration of the string produces a vibration of the magnetic flux in the core and wherein vibration of the magnetic flux in the core induces current in the coil.