A keyless synthesizer t can stimulate all three senses (hearing, muscle movement and visual) at once in patients born with C.H.A.R.G.E. syndrome while they play and, at the same time, enjoy and have fun with the device. A keyless synthesizer operational by a single hand of the user includes an ultrasound range sensor responsive to the distance “d” of a user's hand from the sensor for generating a sensor signal corresponding to the distance “d”. A programmable microcontroller programmed to convert the sensor signal to one of a plurality of discrete signals. A synthesizer is responsive to each discrete signal for generating a discrete tone. A multi-color generator is responsive to each discrete signal for generating a discrete color so that for each discrete signal corresponding to a distance “d” both a discreet tone and an associated discreet color are generated.

A keyless synthesizer t can stimulate all three senses (hearing, muscle movement and visual) at once in patients born with C.H.A.R.G.E. syndrome while they play and, at the same time, enjoy and have fun with the device. A keyless synthesizer operational by a single hand of the user includes an ultrasound range sensor responsive to the distance d of a user's hand from the sensor for generating a sensor signal corresponding to the distance d. A programmable microcontroller programmed to convert the sensor signal to one of a plurality of discrete signals. A synthesizer is responsive to each discrete signal for generating a discrete tone. A multi-color generator is responsive to each discrete signal for generating a discrete color so that for each discrete signal corresponding to a distance d both a discreet tone and an associated discreet color are generated.

A playground structure may include a body, a piezoelectric sensor carried by the body and configured to detect a touch input on adjacent portions of the body, and an output device configured to generate audio indicators. The playground structure may include a controller coupled to the output device and the piezoelectric sensor and configured to selectively change the audio indicators based upon the touch input.

An electronic system that can be combined with a wind musical instrument with lateral holes comprising a tubular body defining, on the inside, an air column, comprises at least one device for emitting elastic mechanical waves in the body of the instrument, at least one device for receiving elastic mechanical waves positioned to receive the waves emitted by at least one emission device after their propagation in the material of the body of the instrument and designed to provide at least one reception signal characteristic of the waves received and a device for detecting and locating the disturbance induced by an action of closing at least one lateral hole of the instrument, configured to detect and identify a configuration of closing of the lateral holes of the instrument from the analysis of at least one reception signal, the detection and location device positioned removably inside the air column of the instrument.

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.

An electronic system that can be combined with a wind musical instrument with lateral holes comprising a tubular body defining, on the inside, an air column, comprises at least one device for emitting elastic mechanical waves in the body of the instrument, at least one device for receiving elastic mechanical waves positioned to receive the waves emitted by at least one emission device after their propagation in the material of the body of the instrument and designed to provide at least one reception signal characteristic of the waves received and a device for detecting and locating the disturbance induced by an action of closing at least one lateral hole of the instrument, configured to detect and identify a configuration of closing of the lateral holes of the instrument from the analysis of at least one reception signal, the detection and location device positioned removably inside the air column of the instrument.

An assembly for transmitting airborne acoustic waves, configured to be combined with a musical wind instrument having side holes, which instrument comprises a tubular body defining an air column and extending locally substantially along a first axis, the transmission assembly comprising: a device for emission of airborne acoustic waves in the air column, comprising an actuator which is separate from the tubular body and able to transform an electrical signal into airborne acoustic waves; a device for reception of airborne acoustic waves, comprising: a microphone suitable for receiving, after their propagation in the air column, the waves transformed by the actuator, the microphone being positioned off-centre with respect to the first axis; a transformation device suitable for transforming the waves received by the microphone into an electrical signal that is characteristic of a configuration of blocking of the side holes of the instrument.