Electric String Pickup Coil Layout for Hum Noise and Tone Balance
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Solution Overview
Problem
Existing pickup devices face a conflict between reducing coil size and maintaining sound quality while effectively removing hum noise, as increasing the inductance value of additional coils to suppress hum noise often deteriorates tone quality.
Innovation Solution
A pickup device with a first coil for string vibration detection, a second coil connected in series with a tuning circuit to adjust induced electromotive force, and a third coil to compensate for any shortfall, allowing for reduced cross-sectional area and inductance while maintaining hum noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the inductance value of coil B is increased to remove external magnetic field noise, then hum noise removal is improved, but the peak frequency of the tone decreases and sound quality deteriorates
Solution Approach 1:
The patent divides the noise cancellation function into two separate coils: coil A (same characteristics as original coil A) and coil B (different characteristics). This segmentation allows each coil to be optimized independently - coil A maintains the original tone quality while coil B provides noise cancellation without compromising the overall sound quality.
Solution Approach 2:
The patent changes the inductance value parameter between the two coils by controlling the number of windings. Coil A has a specific number of windings to maintain original tone characteristics, while coil B has a different number of windings to provide effective noise cancellation. This parameter differentiation resolves the contradiction between noise removal and tone quality.
2Object-affected harmful factors
If the cross-sectional area of coil C is increased to ensure sufficient induced electromotive force, then hum noise removal is improved, but the size of the pickup device increases requiring larger grooves in the instrument body
Solution Approach 1:
The patent optimizes the cross-sectional area parameter of coil B to achieve effective noise cancellation with minimal size. By carefully controlling the number of windings and cross-sectional area, the patent ensures sufficient induced electromotive force for noise removal while keeping the overall pickup device compact, eliminating the need for large grooves in the instrument body.
3Manufacturing precision
If the number of windings of coil C is reduced to decrease inductance value, then the tone quality is improved, but the induced electromotive force becomes insufficient for effective noise removal
Solution Approach 1:
The patent optimizes the number of windings parameter in coil B to achieve the right balance. By controlling the number of windings, the patent achieves sufficient induced electromotive force for noise removal while keeping the inductance value appropriate for maintaining tone quality. The different winding counts between coils A and B allow each to fulfill its specific function optimally.
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
The solution achieves a compact coil configuration that effectively suppresses hum noise without deteriorating sound quality by using a third coil to compensate for induced electromotive force deficiencies in the second coil, ensuring high-frequency characteristics are maintained.
Implementation Method 1
a first coil wound in a first direction around a magnetic core that is configured to be disposed adjacent to the string
Implementation Method 2
a second coil connected in series with the first coil, and wound in a second direction, which is different from the first direction; and a third coil connected in series with the second coil, and wound in the second direction
Implementation Method 3
a tuning circuit configured to adjust a magnitude of an induced electromotive force of the second coil
Data Source
AI summary
A pickup device detects a vibration of a string of an electric string instrument. The pickup device includes a first coil wound in a first direction around a magnetic core that is configured to be disposed adjacent to the string. The pickup device further includes a second coil connected in series with the first coil, and wound in a second direction, which is different from the first direction. The pickup device further includes a third coil connected in series with the second coil, and wound in the second direction. The pickup device further includes a tuning circuit configured to adjust a magnitude of an induced electromotive force of the second coil. The first coil is configured to output a first signal representing the string vibration and any external magnetic field noise picked up by the first coil.