An apparatus includes a first resonant circuit including a first coil mounted to a movable member; a second resonant circuit including a second coil facing the first coil and generating a magnetic field upon supply of an electric current and outputs a detection signal of a voltage level depending on a relative position of the second coil to a position of the first coil; and a first equivalent circuit equivalent to the second resonant circuit in a case where a distance between the first and second coils is infinite and a second equivalent circuit equivalent to the second resonant circuit in a case where the distance is zero. A processor corrects the detection signal based on an output signal output from the first equivalent circuit and an output signal output from the second equivalent circuit, and calculates, based on the corrected detection signal, a displacement amount of the movable member.

A stringed musical instrument includes: a musical instrument body configured such that a string is attached thereto; a pickup configured to: i) detect vibration of the string and ii) output a string vibration signal according to the vibration; a detection sensor that is: i) attached to the musical instrument body and ii) configured to output a detection signal according to a force applied to the musical instrument body; and a controller that is attached to the musical instrument body, and is configured to output, based on the detection signal, a control signal configured to control an operation of an effector configured to impart an effect to the string vibration signal.

An operation detection device for a key operation of a keyboard device includes a conductive unit configured to be disposed on each of keys, a substrate configured to be disposed facing each of the keys in a pressing direction of the keys. The substrate is provided with a sensor including at least first and second coils, the sensor being configured to be disposed spaced from one key so that at least one of the first or second coil outputs a signal corresponding to a distance between the one key and the respective sensor. The operation detection device includes a detection unit configured to detect a displacement of the one key in at least one of a yaw direction or a roll direction based on signals output from the first and second coils during a key pressing stroke of the one key.

A detection system detects a position of each of a plurality of movable members that are displaceable by a playing operation. The detection system includes a controller configured to generate a first signal with a signal that level discontinuously changes over time, a Pi filter configured to convert the first signal to a second signal with a signal level that continuously changes over time, and a signal processor configured to generate, using the second signal, an output signal that depends on a position of each of the plurality of movable members.

An input device includes a first operating element and a first sensor. The first sensor includes a first conductor, a first coil, and a first magnetic material forming an open magnetic circuit together with the first coil. A positional relationship between the first coil and the first magnetic material is fixed. A first distance between a first end portion of the first magnetic material and the first conductor varies according to the amount of operation on the first operating element. The first sensor outputs a first signal corresponding to the first distance.

A haptic controller including a base, a plurality of actuators, each actuator being mounted pivotally relative to the base along a pivoting axis perpendicular to the main direction, a plurality of damping elements, each being positioned so as to dampen a rotation movement of an actuator, the damping elements being elastically deformable between an initial configuration and a final configuration, each damping element including a body of deformable material, the body having at least one recess, wherein, each of the actuators have a protrusion suitable for coming into contact with the associated damping element, and each protrusion has a free end defining a contact with the associated damping element in its initial configuration.

Different aspects of the invention implement a sensor module that can be configured as a keyboard module or as a pedal module, allowing to connect a plurality of keyboard and pedal modules to assemble a configuration to the user's liking, such as, for example, the usual configuration of an 87-key piano together with two pedals. The sensor module transmits information about detected key or pedal strokes to a computer application for playback, either aural or visual. At the same time, the sensor module allows, both in the keyboard module and pedal module configuration, to transmit the feeling of playing a real piano.

A switch device (4, 5) includes: a cap (7) including, on a top surface (711), a first region (71a) and a second region (71b) corresponding to a position where an internal light (133) is disposed and being thinner than the first region (71a); and a switch (61, 62) to which the cap (7) is mounted.

An electronic wind instrument and key operation detection method are provided. The electronic wind instrument includes an instrument body and a plurality of keys which have an operation surface operated by a player's finger and are provided on an external surface of the instrument body. Among the plurality of keys, at least two keys disposed to sandwich or surround a predetermined region comprise restriction parts formed on the operation surfaces. The restriction parts restrict escape of the player's finger from between the at least two keys having the restriction parts formed thereon.

A keyboard apparatus according to an embodiment includes a keyboard and a mutual capacitance proximity sensor. The keyboard includes a first key and a second key arranged in an array direction with respect to the first key. The proximity sensor includes a first electrode having a portion extending from at least a first area below the first key to a second area below the second key, a second electrode arranged in the first area, and a third electrode arranged in the second area. The proximity sensor is a mutual capacitance type sensor and is configured to use a change in capacitance between the first electrode and the second electrode and a change in capacitance between the first electrode and the third electrode.