A key operation detector includes a conductive unit provided in a key of a keyboard device, a substrate provided to face the key in a pressing and releasing direction of the key, a signal output unit including a coil, provided on the substrate, and configured to output a signal corresponding to a position of the conductive unit relative to the signal output unit, and a detection unit configured to detect a position of the key in the pressing and releasing direction and a displacement of the key in a front-rear direction based on the signal output from the signal output unit.

A displacement sensor includes: a detectable portion: including a first coil; and being disposed on a movable member that is displaceable in response to an operation; and a signal generator: including a second coil that opposes the first coil; and being configured to generate a detection signal based on a relative position between the first coil and the second coil. A first distance from a first end of the first coil to a second end of the first coil in a first direction differs from a second distance from a third end of the first coil to a fourth end of the first coil in a second direction perpendicular to the first direction when the first coil is viewed in plan view.

A manual vibrato control device, system and processing arrangement are disclosed. A manual vibrato includes a rotatable shaft, a raised cam section on the shaft, first and second biased collars received on the shaft either side of the cam section, the bias of the first collar being rotationally opposite to the bias of the second collar such that as the shaft rotates in one direction, it receives a return force from the first collar but does not rotate the second collar, and vice versa. Also disclosed are processing techniques to take the rotational data from rotational sensors, preferably Hall Effect, on the shaft and generate pitch change instructions for a pitch modification device. The mapping is user controllable to produce desired effects and performance.

A sensing system for a keyboard. Each key sensor comprises passive and active resonant circuits. The passive resonant circuit has a resonant frequency and the active resonant circuit excites the passive resonant circuit at the resonant frequency. A sensor driver drives the active resonant circuit with an RF drive signal, a multiplexing system multiplexes the drive signal such that simultaneously driven key sensors are separated by at least (k-1) keys, and a detector detects a level of RF signal from a driven key sensor for sensing a position and/or velocity of a key.

To provide an electronic wind instrument capable of accurately detecting the amount of rotation of a transmission member. During an electronic wind instrument performance by a performer, external light (such as light from lighting) may easily shine on the upper surface side of an instrument main body. However, the light-receiving section of an optical sensor faces toward the bottom surface side of the instrument main body therefore external light from the upper surface side of the instrument main body can be prevented from reaching the light-receiving section of the optical sensor. As a result, erroneous detection of the external light by the optical sensor can be suppressed therefore the rotation amount of a transmission member can be accurately detected by the optical sensor.

A signal generation method implemented by a computer system includes: generating an audio signal in response to a manipulation of each of a first key and a second key; and controlling generation of the audio signal based on a reference point that is a position of the first key at a time point of a manipulation of the second key, based on the second key being manipulated during a manipulation of the first key.

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.

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.