Dynamic Microphone Coil Layout for Adjustable Q-Value Damping
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Solution Overview
Problem
Dynamic microphones have a fixed Q-value due to the design, making it difficult for users to adjust the sound quality by controlling mechanical resistance and air resistance, as electromagnetic braking is minimal with high input impedance microphone amplifiers.
Innovation Solution
A signal converter with a magnetic circuit, a diaphragm, a first coil for signal output, and a second coil with a variable resistor forming a closed loop for adjustable electromagnetic braking, allowing users to adjust the Q-value by varying the braking force on the diaphragm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dynamic microphone uses a coil in a magnetic field for signal output, then electromagnetic conversion of sound to electrical signal is achieved, but electromagnetic braking prevents effective Q-value adjustment due to high input impedance of microphone amplifiers
Solution Approach 1:
The patent divides the coil system into two separate coils: a first coil for signal output and a second coil for electromagnetic braking. This segmentation allows the signal output function and braking function to be independently controlled, enabling Q-value adjustment without affecting signal conversion efficiency. The first coil maintains high input impedance connection for efficient signal transfer, while the second coil provides adjustable braking through variable resistance connection.
Solution Approach 2:
The patent makes the coil system multi-functional by having the second coil serve dual purposes: it can provide electromagnetic braking when connected through the variable resistor, and can be disconnected or adjusted independently from the signal output path. This allows a single magnetic field system to perform both signal generation and vibration control functions.
2Adaptability or versatility
If the Q-value is adjusted by changing air resistance using a gap between the coil and chamber, then Q-value control is achieved, but the adjustment is fixed on an individual-microphone basis and not user-adjustable
Solution Approach 1:
The patent replaces the fixed mechanical gap adjustment with a dynamic electromagnetic braking system controlled by a variable resistor. The Q-value can now be adjusted dynamically during operation by changing the resistance value, allowing real-time adaptation without disassembling or physically modifying the microphone structure. This makes the system adaptable while maintaining ease of operation through simple electrical control.
Solution Approach 2:
The patent substitutes the mechanical air resistance adjustment mechanism (physical gap modification) with an electromagnetic braking mechanism controlled by electrical resistance. Instead of mechanically changing the gap between coil and chamber, the system uses electromagnetic forces generated by the second coil and variable resistor to achieve Q-value adjustment, eliminating the need for physical modification while maintaining control capability.
3Ease of operation
If electromagnetic braking is used to control Q-value, then vibration damping is achieved, but the braking effect is minimal when connected to high input impedance amplifiers
Solution Approach 1:
By separating the signal output coil from the braking coil, the system can apply full electromagnetic braking force through the second coil without being limited by the high input impedance of the amplifier. The variable resistor provides a low-impedance path for braking current, enabling strong damping effect independent of the amplifier's input characteristics.
Solution Approach 2:
The variable resistor acts as an intermediary element that enables strong electromagnetic braking by providing a controllable low-impedance path for current flow in the second coil. It mediates between the amplifier and the braking coil, allowing the system to achieve substantial braking force while still being compatible with high input impedance amplifier connections through the first coil.
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 easy adjustment of the Q-value without impairing signal conversion efficiency, allowing users to achieve desired sound quality by varying the braking force on the diaphragm through the second coil's current flow.
Implementation Method 1
The first coil is disposed in the magnetic gap and configured to output an electrical signal based on vibration of the diaphragm
Implementation Method 2
The second coil is disposed in the magnetic gap and configured to brake the diaphragm
Data Source
AI summary
A signal converter includes a magnetic circuit, a diaphragm, a first coil, a second coil, and a variable resistor. The magnetic circuit has a magnetic gap. The diaphragm is disposed over an opening of the magnetic circuit. The first coil is disposed in the magnetic gap and configured to output an electrical signal based on vibration of the diaphragm. The second coil is disposed in the magnetic gap and configured to brake the diaphragm. The variable resistor is connected to a first end and a second end of the second coil and configured to form a closed loop circuit together with the second coil.