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.