公开(公告)号：US3786167A

公开(公告)日：1974-01-15

申请号：US3786167D

申请日：1972-08-14

申请人： BORELL J ,  BONHAM A

发明人： BONHAM A ,  BORELL J

IPC分类号： G10H1/34 ,  G10H1/36 ,  G10H3/00 ,  G10H5/00

CPC分类号： G10H1/36 ,  G10H1/342 ,  Y10S84/30

摘要： Musical instruments playable in duet fashion by one player includes a stringed instrument with segmented frets. A control system for the other instrument includes a control circuit for each string and which has actuating circuits that are associated with the open and keyed string tones playable on the string. The actuating circuits associated with the second and higher string keying positions are enabled by simultaneous string contact with adjacent fret sections, and simultaneous string contact with a plate and fret segment at the first position serves to enable the actuating circuit associated with the first string keying position. A disabling circuit has components associated with each actuating circuit and which disable the associated actuating circuit in response to output signals of the actuating circuits associated with the higher keying positions. Open tone sensing circuits are avoided in one embodiment especially designed for chord playing players of the stringed instrument and in which simultaneous signals from a predetermined number of disabling circuits that are enabled by simultaneous keying of different strings serve to control an auxiliary circuit to enable the actuating circuits associated with the open tones of the unkeyed strings.