Grounding Wiring for Unbalanced Audio Noise in Dual-Board Devices
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Solution Overview
Problem
Unbalanced ground between circuit boards in dual-mode mobile devices causes significant audio noise due to differing reference grounding ends, leading to impaired user experience.
Innovation Solution
An electronic apparatus with a selection unit that connects the first and second circuit boards through grounding wiring, allowing the selection unit to switch between reference grounding ends to match the audio source and receiver's reference points, ensuring both use the same grounding end as a reference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If two systems are disposed on separate circuit boards to reduce device size, then the device size is reduced, but audio noise increases due to unbalanced ground between circuit boards
Solution Approach 1:
The patent introduces a grounding wiring as an intermediary element that physically connects the first circuit board to the second circuit board, establishing a common reference potential between them. This mediator resolves the unbalanced ground issue by providing a direct conductive path that equalizes the electrical reference levels, thereby eliminating the audio noise caused by ground potential differences while preserving the compact dual-board architecture
Solution Approach 2:
The patent implements equipotentiality by connecting the grounding ends of both circuit boards through a dedicated grounding wiring, ensuring that both boards operate at the same electrical reference potential. This creates an equipotential environment that prevents ground loops and eliminates the audio noise generated by potential differences between the two systems
2Reliability
If different reference grounding ends are used on each circuit board, then each system operates independently, but current noise is generated when using single-end audio input
Solution Approach 1:
The grounding wiring serves as a mediator that bridges the independent grounding systems of the two circuit boards, allowing them to maintain operational independence while establishing a common reference potential. This intermediary connection enables the receiver to use either grounding end as reference without generating current noise, as both grounds are now electrically connected
3Object-affected harmful factors
If grounding wiring is added to connect circuit boards, then audio noise is reduced, but device complexity increases
Solution Approach 1:
The patent extracts the grounding function from the existing complex inter-board connections and implements it through a dedicated, simplified grounding wiring. By separating the grounding connection from other signal and power connections, the patent reduces overall device complexity while effectively addressing the audio noise issue through this single, focused grounding path
Data Source
AI summary
An electronic device includes a first circuit board having a first audio source and a first reference grounding end, a second circuit board having a second audio source and a second reference grounding end, a flexible board cable, a grounding wiring, a selection unit, and a receiver. The flexible board cable couples the first audio source to the second circuit board. The grounding wiring couples the first grounding end to the second circuit board. The selection unit is used for selecting one from the first and second audio sources to output and selecting one from the first and second reference grounding ends to output. An input end of the receiver is controlled by the selection unit to be connected to the first or second audio sources, and a grounding end of the receiver is controlled by the selection unit to be connected to the first or second reference grounding ends.