HUM CANCELING ELECTROMAGNETIC PICKUP FOR STRINGED MUSICAL INSTRUMENT WITH TONAL CHARACTERISTIC OF SINGLE COIL PICKUP

摘要

PROBLEM TO BE SOLVED: To provide a double-coil pickup having a magnetic flux shield configuration which shields an upper coil from magnetic flux variations caused by unwanted noise and concentrates noise flux in a lower coil.;SOLUTION: The magnetic flux shield concentrates magnetic flux generated by magnets and envelopes strings of a stringed instrument in the vicinity of the upper coil. The upper coil and lower coil are coupled so that the noise signal generated in the lower coil is subtracted from the signal generated in the upper coil so as to cancel noise therefrom. The resulting output signal has substantially less noise than a one coil pickup. The shield also allows the lower coil to be smaller such that the overall size of the double-coil pickup can be small enough to fit into the cavities formed for traditional one coil pickups.;COPYRIGHT: (C)2005,JPO&NCIPI