Detection system and keyboard device

A detection system for a keyboard instrument including a plurality of movable members, including a first movable member and a second movable member, that are displaceable in response to a user playing operation of the keyboard instrument, the detection system comprising:

• a plurality of detectable portions each of a magnetic or conductive body, and including:
• a first detectable portion disposed on the first movable member;
• and
• a second detectable portion disposed on the second movable member;
• a detection board including:
• a first detection coil disposed facing the first detectable portion;
• a second detection coil disposed facing the second detectable portion;
• and
• a detection circuit configured to:
• generate a first detection signal depending on a distance between the first detectable portion and the first detection coil;
• and
• generate a second detection signal depending on a distance between the second detectable portion and the second detection coil;
• a control board, which is discrete from the detection board, including a control integrated circuit configured to:
• generate, based on the first detection signal, first displacement data indicating a position of the first movable member;
• and
• generate, based on the second detection signal, second displacement data indicating a position of the second movable member;
• and
• a transmitter configured to transmit the first detection signal and the second detection signal from the detection board to the control board.

A keyboard device comprising:

• a plurality of keys including a first key and a second key;
• a plurality of detectable portions each of a magnetic or conductive body, and including:
• a first detectable portion disposed on the first key;
• and
• a second detectable portion disposed on the second key;
• a detection board including:
• a first detection coil disposed facing the first detectable portion;
• a second detection coil disposed facing the second detectable portion;
• and
• a detection circuit configured to:
• generate a first detection signal depending on a distance between the first detectable portion and the first detection coil;
• and
• generate a second detection signal depending on a distance between the second detectable portion and the second detection coil;
• a control board, which is discrete from the detection board, including a control integrated circuit configured to:
• generate, based on the first detection signal, first displacement data indicating a position of the first key;
• and
• generate, based on the second detection signal, second displacement data indicating a position of the second key;
• and
• a transmitter configured to transmit the first detection signal and the second detection signal from the detection board to the control board.