Wireless String Tuner Using UV Reflection for Simultaneous Pitch Detection
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Solution Overview
Problem
Conventional electronic tuning devices for stringed instruments are limited by the need for close proximity, are prone to interference, require manual operation for each string, and can be cumbersome and distracting, making them inefficient and inconvenient for musicians, especially in live performance settings.
Innovation Solution
A compact, self-contained tuning apparatus that attaches under the strings of an instrument, using UV light sensors and prismatic lenses to detect string vibrations independently and transmit pitch data wirelessly for real-time graphical display on a remote device, allowing simultaneous tuning of all strings without manual plucking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional electronic tuning device uses a microphone for sensing, then it can detect string vibrations, but it must be located close to the instrument and requires a quiet environment to avoid interference
Solution Approach 1:
The patent replaces the acoustic sensing method (microphone detecting sound waves in air) with an optical sensing method (UV light sensors detecting reflected light from string vibrations). This substitution eliminates the need for acoustic isolation and allows accurate pitch detection without being affected by background noise from other instruments or crowd noise, while also allowing the device to be positioned at a distance from the instrument.
2Measurement precision
If a conventional electronic tuning device evaluates one string at a time, then it can provide accurate pitch information, but it requires manual operation and time to tune the entire instrument
Solution Approach 1:
The patent divides the sensing function into multiple independent UV light sensor assemblies, with each sensor dedicated to detecting vibrations of a specific string. This segmentation allows the device to simultaneously monitor pitch information from multiple strings at once, enabling the musician to tune multiple strings concurrently without the need to pluck and evaluate each string sequentially, thereby significantly increasing tuning productivity while maintaining accurate pitch measurement for each individual string.
3Measurement precision
If a vibration-detecting device is attached to the instrument, then it can detect string vibrations, but it must be attached and removed with each tuning or left attached while playing where it is distracting and disrupts the balance
Solution Approach 1:
The patent replaces the vibration detection method (physical contact sensors requiring attachment to the instrument body) with an optical detection method (UV light sensors detecting reflected light from vibrating strings). This allows the sensing device to be positioned remotely from the instrument without requiring physical attachment, eliminating distractions and balance disruptions during performance while maintaining accurate vibration detection through optical means.
4Ease of operation
If a tuning device is located on the floor near the musician's feet, then it can be positioned away from the instrument, but it is in a high-traffic area where the unit is more likely to become damaged or lost
Solution Approach 1:
The patent replaces the wired connection system (requiring the device to be tethered to the instrument or amplifier) with a wireless communication system. This allows the display and control unit to be positioned in a safe, accessible location away from high-traffic areas and potential damage sources, while still maintaining real-time communication with the sensing elements on the instrument, thereby improving device reliability and durability without compromising hands-free operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables quick, accurate, and convenient tuning of stringed instruments by eliminating interference, allowing musicians to tune all strings simultaneously while keeping hands free, and providing a durable, non-intrusive solution for live performances.
Implementation Method 1
A light source is also provided on the circuit board, which emits ultraviolet light. The UV light source may be in the form of a light emitting diode (LED) or any other common type of UV source and may be in the form of either a single UV source that illuminates all the instrument strings simultaneously, or individual UV sources that illuminate each string respectively. The UV emitted from the source(s) is reflected from a surface of the instrument's strings back toward the UV sensors.
Implementation Method 2
The sensors are sensitive to this reflected UV light and produce an electrical voltage (in the case of a phototransistor sensor) or an electrical current (in the case of a photodiode sensor) in a circuit of the circuit board that is proportional to the amount of light detected by the sensor.
Implementation Method 3
These lenses are made from a solid, transparent material such as acrylic or polycarbonate plastic, glass, epoxy, or any other optically clear material and shaped in the form of an isosceles triangle, symmetric about the plane passing through the center line of the object string and the center of the sensor. The lenses serve two purposes. Firstly, they converge reflected light from the object string directly overhead by refracting the light inward, intensifying the light contacting the photosensor and increasing its effect.
Implementation Method 4
The second purpose of the prismatic lenses is to reject light reflected from adjacent strings that would interfere with the signal from the object string. Light reflecting from adjacent strings enters the prismatic lens from a more oblique angle than light reflected from the object string directly above. Consequently, though the light is refracted downward toward the sensor as it enters the prism, when it passes on to the bottom inner surface of the prism, nearest the sensor, and attempts to exit, the light is reflected back into the prism and does not pass through to the sensor.
Data Source
AI summary
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.