Abstract: An acoustic resonance device is provided including a cylindrical body, a tympanic cover, a vibration element, a lighting element, and a sensor. The cylindrical body includes an inner surface which defines a chamber. The chamber extends from a first end to a second end. The first end of the chamber is uncovered. The tympanic cover is coupled to the second end of the cylindrical body. The vibration element includes a first end and a second end. The first end of the vibration element is coupled to the tympanic cover. The lighting element is arranged within the chamber of the cylindrical body. The sensor is electrically coupled to the lighting element and is adapted to control the lighting element.

Abstract: Provided is a device for reporting a tuning status by sound on the basis of an audio signal acquired. The device includes: a signal acquisition means for acquiring the audio signal; a comparison means for comparing the frequency of the audio signal with a reference frequency corresponding to the audio signal; and a generation means for generating a first sound signal when the frequency of the audio signal is lower than the reference frequency and generating a second sound signal different from the first sound signal when the frequency of the audio signal is higher than the reference frequency.

Abstract: A stringed instrument tuner that senses the vibration of all the strings of the instrument independently and simultaneously via ultraviolet reflective light sensors that are immune to interference from ambient alternating-current lighting. The pitches of the strings are then measured continuously in real-time and transmitted wirelessly to a receiver that simultaneously graphically displays how far out-of-tune all of the strings are so that the musician can instantly see which strings need tuning and tune them quickly. The receiver may be a smartphone, smartwatch, smart glasses, computer, self-tuning system, or a dedicated wearable receiver-display unit.

Abstract: A tuning device includes a pitch extraction device with which the pitch of an input signal is extracted and a deviation detection device with which the deviation of the pitch that has been extracted by the pitch extraction device from a standard pitch is detected. The deviation that has been detected by the deviation detection device is displayed by an indicator of a mechanical meter. The tuning device also includes an ultrasonic motor that drives the indicator. A controller drives the ultrasonic motor in conformance with the deviation that has been detected by the deviation detection device.