Adjustable Magnetic Pickup for String Timbre Control
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Solution Overview
Problem
Existing electromagnetic pickups for stringed instruments often produce harsh sounds due to strong magnetic fields, which can dampen string vibrations and affect tonal character and timbre, while attempts to improve tonality by increasing coil turns result in reduced efficiency and altered tone at different pitches.
Innovation Solution
The design incorporates an adjustable gap between a movable magnetic flux conductor and a magnetic device within the pickup, allowing for independent modulation of timbre without altering the distance from the strings, using a bobbin with a coil and a selectively movable magnetic device to adjust the magnetic field strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the magnetic field strength is increased to improve output voltage, then sensitivity is improved, but string vibration is dampened and timbre is affected
Solution Approach 1:
The patent divides the magnetic field generation into two independent components: a fixed magnetic device that provides the primary magnetic field for sensitivity, and a selectively movable magnetic device that independently modulates timbre. This segmentation allows each component to be optimized for its specific function without compromising the other.
Solution Approach 2:
The patent introduces a selectively movable magnetic device that can dynamically adjust the magnetic field configuration to modulate timbre. This dynamic adjustment capability allows the system to change timbre characteristics without affecting the fixed sensitivity determined by the distance to the string.
2Object-generated harmful factors
If the number of coil turns is increased to reduce harshness, then timbre is improved, but inductance and resistance increase reducing efficiency
Solution Approach 1:
Instead of changing the coil parameters (number of turns, wire gauge), the patent changes the magnetic field parameters by introducing a selectively movable magnetic device. This allows timbre modulation through magnetic field configuration changes rather than electrical parameter changes, preserving coil efficiency.
3Measurement precision
If the pickup distance to string is decreased to improve sensitivity, then output voltage is increased, but magnetic field dampening increases affecting sustain
Solution Approach 1:
The patent separates the sensitivity function (fixed distance between pickup and string) from the timbre function (adjustable magnetic field configuration). This allows the pickup to maintain optimal fixed distance for sensitivity while using the movable magnetic device to control timbre and sustain characteristics independently.
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
This approach enables precise modulation of timbre, maintaining sensitivity and dynamic range while avoiding harshness, by adjusting the magnetic field strength without compromising the instrument's sustain or introducing false harmonics.
Implementation Method 1
coils wound on one or more bobbins disposed in the field to generate electrical signals corresponding to flux variations in the field due to the strings' vibrations
Implementation Method 2
a first selectively movable magnetic device for generating a magnetic field around the first bobbin
Implementation Method 3
a movable magnetic flux conductor selectively extending through the bobbin, disposed above the first selectively movable magnetic device
Data Source
AI summary
Devices and methods for transducing vibrations of a ferromagnetic string in a musical stringed instrument are provided. Specifically, including those for modulating the timbre of a stringed musical instrument with an electromagnetic pickup independent of loudness, sensitivity and dynamic range.