A signal processing system, machine and method of use to dynamically change the parameters of an audio-visual signal processing circuit without making physical contact.

A displacement amount detecting apparatus is provided and includes: transmission member, transmitting a displacement on one end side thereof to a displacement on the other end side thereof; a sensor, disposed to face the other end side of the transmission member, and configured to output a value according to a distance between the sensor and the other end side of the transmission member; a calculation device, calculating a value for indicating the distance based on the value output by the sensor and a reference value; and a correction device, correcting the reference value. When the one end side is displaced in a first direction, the other end side is displaced in a second direction opposite to the first direction and away from the sensor. The correction device is configured to correct the reference value based on the value for indicating the distance calculated by the calculation device.

With an electronic percussion 100, a mesh-shaped head 101 is supported by a shell 103 formed into a cylindrical shape. The shell 103 includes an optical sensor 105 inside and a sensor cover body 110 outside. The optical sensor 105 includes a light emitter 105a that irradiates light to a back surface 101b of the head 101 and a light receiver 105b that receives reflected light from the back surface 101b of the head 101. This optical sensor 105 is supported by a sensor supporting body 104 at a position adjacent to the back surface 101b of the head 101. The sensor cover body 110 is formed so as to have a size with which the sensor cover body 110 covers the optical sensor 105 at the position that is opposed to the optical sensor 105 on a struck surface 101a side, which is opposite to the back surface 101b of the head 101 and which faces the optical sensor 105.

An electronic musical instrument comprising a lower frame member having a first end and a second end, and above the handle portion of the first end are a plurality of apertures extending through the lower frame member towards the second end, pins mounted within the plurality of apertures in predetermined locations, jingles loosely mounted to the pins, so that when the instrument is shaken a tambourine sound is emitted, an upper frame member having a first end and a second end wherein the first end of the upper frame member is attached distal to the first end of the lower frame member, at least one strip attached to the lower frame member, and an activation switch attached to the upper frame member, so that when the second end of the upper frame member and the second end of the lower frame member come in contact the strip is activated.

A controller to control an electronic musical instrument includes: first to third input units for a user to input play data and a frame having the first to third input units arranged therein. The frame has a wall surrounding an internal space, the wall has a three dimensional surface, the first to third input units configure one set, and the first to third input units configuring one such set are arranged adjacent in a circumferential direction of the three dimensional surface and the plurality of sets are arranged adjacent in a longitudinal direction of the three dimensional surface.

With an electronic percussion 100, a mesh-shaped head 101 is supported by a shell 103 formed into a cylindrical shape. The shell 103 includes an optical sensor 105 inside and a sensor cover body 110 outside. The optical sensor 105 includes a light emitter 105a that irradiates light to a back surface 101b of the head 101 and a light receiver 105b that receives reflected light from the back surface 101b of the head 101. This optical sensor 105 is supported by a sensor supporting body 104 at a position adjacent to the back surface 101b of the head 101. The sensor cover body 110 is formed so as to have a size with which the sensor cover body 110 covers the optical sensor 105 at the position that is opposed to the optical sensor 105 on a struck surface 101a side, which is opposite to the back surface 101b of the head 101 and which faces the optical sensor 105.

An electronic keyboard using a camera, and more particularly, to an electronic keyboard using a camera, which includes a retroreflective film, a light source for irradiating light on to the retroreflective film, a camera for capturing light of a light source retroreflected from the retroreflective film, and an image processing means that analyzes the captured image to track the position of the reflected light source, to find a depressed state of the keyboard, and to generate a sound of an instrument corresponding to the depressed state.

A detection device includes: a movement detector that includes light emitters and light receivers, wherein in accordance with movement of a moving body among moving bodies, each corresponding to a different combination of a light emitter and a light receiver, a light reception level of the light receiver in a combination corresponding to the moving body changes; and a processor coupled to a memory storing instructions that, when executed by the processor, configure the processor to: cause each of the light emitters to sequentially emit light in each light emission period by providing a driving signal, and cause a signal level of the driving signal to differ between unit periods within the light emission period; and select, for each light emission period, a light reception level in one of the unit periods within the light emission period as a detected value for each of the light receivers.

An electronic musical performance controller comprising a microprocessor, proximity sensor, gyroscope, accelerometer, narrow beam guide light, and one or more finger monitoring sensors. The proximity sensor is mounted on the front of the controller and represents the origin of a Cartesian coordinate system. Preprogrammed events are mapped into the surrounding space at fixed distances and pitch and yaw angles from the proximity sensor. The guide light beam illuminates the proximity sensor's field of view. The controller is held in one hand and the guide light beam is aimed at the other hand. When the player's finger triggers a finger monitoring sensor, the length of the guide light beam and the pitch and yaw of the proximity sensor are measured. This information is used to determine which mapped event the player is selecting. The preprogrammed event is then output via a MIDI bus or built in sound module and speaker.

A method for generating a music file for recording user performance may include: detecting, by a sensor, an event indicating a status change of an execution device of the keyboard instrument; generating, by the sensor, a signal corresponding to the detected event; receiving, by a processor, the signal; and generating, by the processor, a music file based on the signal. In some embodiments, the execution device may include a weight lever. The weight lever may a concrete structure in the keyboard instrument to simulate a rebound force generated by hammer striking on string, by striking on an elastic structure. In some embodiments, a rebound force for a first weight lever may be different from a rebound force for a second weight lever by adjusting parameters of the elastic structure or the weight lever.