Electromagnetic String Exciter for Harmonic Sound Generation
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Solution Overview
Problem
Conventional stringed instruments require playing skills to generate resonant sounds with higher harmonic components, and their design exposes strings, leading to safety issues and maintenance challenges.
Innovation Solution
A stringed instrument with a body, strings, and a bridge where the string exciting device is driven by an electrical signal, allowing for vibration without direct contact between the bridge and strings during vibration, and the components are housed within the instrument body to prevent injuries and facilitate maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the bridge contacts the string at multiple points to generate higher harmonic components, then the sound quality is improved, but the device complexity increases
Solution Approach 1:
The patent replaces the mechanical jawari bridge structure with an electromagnetic exciter system. Instead of using a curved bridge surface to contact and vibrate the string at multiple points mechanically, an electromagnetic exciter generates magnetic field vibrations that are transmitted to the string, achieving the same harmonic generation effect without the complex mechanical contact structure.
2Ease of operation
If many strings are exposed to the outside for playing access, then the ease of operation is improved, but safety hazards increase
Solution Approach 1:
The patent extracts the string vibration function from the exposed external strings and transfers it to internal strings housed within the instrument body. The electromagnetic exciter is positioned inside the body to vibrate the strings internally, eliminating the need for externally exposed strings while maintaining the ability to produce music.
Solution Approach 2:
The patent introduces an electromagnetic field as an intermediary between the player's control and the string vibration. Instead of direct mechanical contact with exposed strings, the player controls the electromagnetic exciter which then vibrates the internally housed strings, providing a safe intermediary mechanism.
3Reliability
If the bridge structure is used to generate resonant sound, then the sound quality is improved, but the ease of repair deteriorates
Solution Approach 1:
The patent substitutes the complex mechanical jawari bridge with an electromagnetic exciter system. The electromagnetic components (magnet, coil, or piezoelectric element) are simpler to manufacture, adjust, and replace compared to the precisely curved wooden bridge structure, significantly improving ease of repair and maintenance.
4Device complexity
If direct string vibration is used for sound production, then the simplicity of the system is maintained, but the ability to generate higher harmonic components deteriorates
Solution Approach 1:
The patent employs electromagnetic vibration that induces mechanical oscillation in the strings. The electromagnetic exciter generates vibrations at multiple frequencies including fundamental and harmonic frequencies, naturally producing higher harmonic components through the physics of string vibration without requiring complex mechanical intervention.
Solution Approach 2:
The patent changes the vibration parameters by using electromagnetic field frequency control to excite the string at different modes. By varying the electromagnetic excitation frequency and duration, the system can selectively enhance fundamental tones or harmonic overtones, providing rich sound variation while maintaining system simplicity.
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 anyone to enjoy sounds with higher harmonic components, reverberant, or sustained sounds without playing skills, while ensuring safety and ease of maintenance by using an electrical signal to vibrate the strings and housing the components internally.
Implementation Method 1
a string exciting device designed to be driven by an electrical signal to vibrate the string in response to the electrical signal
Implementation Method 2
when the strings vibrate, the strings are brought into contact with the convex surface not only at a first support point where the string vibration terminates but also at a point located on a vibration side of the first support point, thereby generating a string vibration sound with higher harmonic components
Data Source
AI summary
A stringed instrument includes a body, a string, a string exciting device and a bridge. The body supports the string, the string exciting device and the bridge. The string has a scale length determined by a distance between a first support point and a second support point. The string exciting device is designed to be driven by an electrical signal having a certain frequency and vibrate the string by applying an excitation signal having a frequency corresponding to the frequency of the electrical signal. The bridge has the first support point and a surface located between the first support point and the second support point and designed to come into contact with the string during vibration of the string.