Electrical string-instrument

Claim 1

An electrical string-instrument comprising: N conductive strings A 1 , A 2 , . . . A N ; a support member having a major surface including a string receiving surface and stretching the strings A 1 to A N in opposing relation thereto to extend in substantially the same plane in parallel relation to one another; a plurality of conductive frets disposed on the string receiving surface, which frets are sequentially disposed in the direction of extension of the strings A 1 to A N to extend in the direction perpendicular thereto; electromechanical transducer means C 1 , C 2 , . . . C N disposed in the area other than the string receiving area in the area opposite to the strings A 1 to A N on the major surface of the support member for converting mechanical vibrations of the strings A 1 , A 2 , . . . A N into corresponding electrical signals E 1 , E 2 , . . . E N , respectively; magnetic field generating means for generating a constant magnetic field to cover therewith the strings A 1 to A N ; an electrical circuit for producing feedback signals M 1 , M 2 , . . . M N based on the electrical signals E 1 , E 2 , . . . E N respectively derived from the electromechanical transducer means C 1 , C 2 , . . . C N ; and feedback signal supply means for supplying the feedback signals M 1 , M 2 , . . . M N to flow feedback currents I 1 , I 2 , . . . I N in those of the strings A 1 , A 2 , . . . A N placed in the constant magnetic field emanating from the magnetic field generating means.