公开(公告)号：US3499090A

公开(公告)日：1970-03-03

申请号：US3499090D

申请日：1967-02-28

申请人： BALDWIN CO D H

发明人： MEYER ALBERT

IPC分类号： G10H1/10 ,  G10H5/06

CPC分类号： G10H1/10 ,  G10H5/06

公开(公告)号：US3617603A

公开(公告)日：1971-11-02

申请号：US3617603D

申请日：1970-03-23

申请人： BALDWIN CO D H

发明人： WAYNE WILLIAM C JR ,  MEYER ALBERT

IPC分类号： G10H1/02 ,  G10H3/06

CPC分类号： G10H1/02 ,  Y10S84/05

摘要： In a keyed-photocell electronic organ, two (or more) photocells are keyed with a single, make-break key switch via two (or more) respective RC keying or envelope-control circuits, one of which provides a transient keying pulse to a photocell in order to produce a chiff tone component. The chiff keying circuit includes a series capacitor, the output terminal of which is always clamped to ground by a diode circuit except for a short interval after the key switch is closed during which the level at the output terminal initially jumps and then falls off as the series capacitor charges.