Microphone Connector Shielding High Frequency Noise
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Solution Overview
Problem
Capacitor microphones are susceptible to high frequency electromagnetic noise, particularly from cellular phones, which is not effectively blocked by existing connector designs, leading to noise interference in audio signals.
Innovation Solution
A microphone connector design featuring a receptacle with pins connected via a printed circuit board, where ceramics capacitors are mounted between the grounding pin and other pins to short-circuit high frequency signals, providing reliable shielding without risking capacitor breakage due to pin displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional cable connector with insulating sleeve is used, then the structure is simple and easy to manufacture, but external high frequency electromagnetic waves can enter through the connector and cause noise in the audio signal
Solution Approach 1:
A ground wire is introduced as an intermediary element between the connector and the microphone cable. This ground wire is connected to the connector housing and extends along the cable to provide an additional grounding path, effectively shielding against high frequency electromagnetic waves while maintaining signal integrity
Solution Approach 2:
The connector structure combines multiple materials with different properties: the connector housing provides mechanical support and initial shielding, the ground wire provides additional electromagnetic shielding and grounding, and the insulating sleeve provides electrical isolation. This composite approach achieves comprehensive noise shielding while maintaining structural integrity
2Object-affected harmful factors
If ceramics capacitors are soldered to pins to block high frequency signals, then electromagnetic noise is reduced, but the capacitors are subject to stress and may break during connector attachment and detachment
Solution Approach 1:
The ground wire serves as a flexible intermediary that provides the necessary electrical connection without rigidly constraining the capacitors. This flexible grounding path allows the connector to be attached and detached without transmitting stress to the ceramics capacitors, preventing damage while maintaining noise blocking functionality
Solution Approach 2:
The invention changes the physical state and arrangement of the grounding connection from rigid soldered joints to flexible wire connections. This parameter change allows the system to accommodate mechanical movement during attachment and detachment while maintaining electrical continuity for noise filtering
3Object-affected harmful factors
If the connector housing is made conductive to shield electromagnetic waves, then noise immunity is improved, but the connector cannot be easily detached from the power module due to adhesion
Solution Approach 1:
The shielding function is segmented into multiple independent components: the connector housing provides structural support and initial shielding, the ground wire provides additional electromagnetic shielding, and separate insulating elements provide electrical isolation. This segmentation allows each component to be optimized independently, maintaining detachability while achieving comprehensive shielding
Solution Approach 2:
Insulating sleeves and spacers are introduced as intermediary elements between the conductive connector housing and the power module. These intermediaries maintain the necessary electrical isolation and mechanical clearance, allowing the conductive housing to provide shielding without creating permanent adhesion that would prevent detachment
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
Effectively blocks external high frequency signals from entering the microphone, reducing noise interference in audio signals and ensuring capacitor integrity during plug attachment and detachment.
Implementation Method 1
capacitors connected between a wiring pattern for a grounding pin and wiring patterns for other pins, respectively, in order to short-circuit high frequency signals
Data Source
AI summary
A microphone connector comprising a receptacle which is made of a conductive material, receives a cable connector at one end of a microphone cable, includes a bottom plate, and a plurality of pins passing through the bottom plate. In the microphone connector, a cylindrical metal tube is coupled to a periphery of the bottom plate and is electrically integral with the receptacle; a printed circuit board is attached to the cylindrical metal tube and covers an opening thereof; connecting terminals are electrically integral with the pins, extend outward from the bottom plate, pass through the printed circuit board, and are electrically connected to wiring patterns on the printed circuit board; and capacitors are connected between the wiring pattern for the grounding pin and the wiring patterns for the other pins, and short-circuit high frequency signals.