US 12,112,732 B2
Keyboard sensor systems and methods
James Hastings Clark, St Neots (GB); and John Michael McAuliffe, St Neots (GB)
Assigned to SONUUS LIMITED, St Neots (GB)
Filed by SONUUS LIMITED, St Neots (GB)
Filed on Apr. 21, 2022, as Appl. No. 17/726,190.
Application 17/726,190 is a continuation of application No. 16/904,994, filed on Jun. 18, 2020, granted, now 11,657,789.
Application 16/904,994 is a continuation of application No. PCT/GB2018/053683, filed on Dec. 19, 2018.
Claims priority of application No. 1721448 (GB), filed on Dec. 20, 2017; and application No. 1812826 (GB), filed on Aug. 7, 2018.
Prior Publication US 2022/0246122 A1, Aug. 4, 2022
Int. Cl. G10H 1/055 (2006.01); G10H 1/18 (2006.01); G10H 1/34 (2006.01); H03K 17/972 (2006.01); H03K 17/97 (2006.01)
CPC G10H 1/0555 (2013.01) [G10H 1/182 (2013.01); G10H 1/344 (2013.01); H03K 17/972 (2013.01); G10H 2220/221 (2013.01); G10H 2220/271 (2013.01); G10H 2220/275 (2013.01); H03K 2017/9706 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A sensing system comprising a set of sensors for the keyboard of a keyboard instrument,
wherein the keyboard has a plurality of keys;
wherein each sensor comprises a passive resonant circuit for mounting on a moving part of a key and an active resonant circuit for mounting in a reference position, the passive resonant circuit having a resonant frequency, the active resonant circuit exciting the passive resonant circuit at the resonant frequency, each sensor further having a detector to detect a variation of a resonant signal in the active resonant circuit with a relative position of the active and passive resonant circuits to detect a position and/or velocity of the key; and
wherein one or more coils of the active resonant circuit comprise two coils with opposing winding directions connected in series such that the one or more coils of at least the active resonant circuits have windings in opposite senses to thereby reduce interference between sensors of adjacent keys.