In-Vehicle Audio Noise Control via Conductive Ground Path
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing method of attaching a magnetic disk drive does not consider the noise current flowing to the information apparatus chassis, which can affect the audio board and degrade audio processing performance.
Innovation Solution
An in-vehicle information apparatus with a disc reproducing unit, an audio board, a coupling unit connected to the vehicle body ground, and a conductive unit with lower electrical resistivity than the chassis, guiding noise currents away from the audio board by routing them through a second chassis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the disc reproducing unit is attached to the first chassis for structural support, then the mechanical stability is improved, but noise current flows to the audio board affecting audio processing performance
Solution Approach 1:
The chassis is divided into two separate units: the first chassis for mechanical support and the second chassis for electrical grounding. This segmentation allows the disc reproducing unit to be mechanically supported by the first chassis while its noise current is guided to the second chassis through the conductive unit, preventing interference with the audio board.
Solution Approach 2:
The conductive unit acts as an intermediary component with lower electrical resistivity than the chassis. It is electrically connected to the disc reproducing unit and the second chassis, serving as a preferred path for noise current to flow to ground without passing through the audio board or first chassis.
2Object-affected harmful factors
If a conductive unit with lower electrical resistivity is introduced to guide noise current, then noise current suppression is improved, but device complexity increases
Solution Approach 1:
The conductive unit is integrated with the bracket that attaches the disc reproducing unit to the chassis. This merging combines the mechanical support function and the electrical grounding function into a unified structure, avoiding the need for completely separate components and reducing overall device complexity.
Solution Approach 2:
The bracket serves multiple functions: it provides mechanical support for the disc reproducing unit, acts as a structural connector between the chassis components, and through integration with the conductive unit, provides an electrical ground path for noise current. This multi-functionality reduces the number of separate components needed.
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 conductive unit effectively directs noise currents generated in the disc reproducing unit to the coupling unit, preventing them from affecting the audio board and maintaining audio processing quality.
Implementation Method 1
a conductive unit electrically connected to the bracket and having a smaller electrical resistivity than the first chassis and the bracket, the conductive unit for guiding a noise current to the coupling unit via the second chassis
Data Source
AI summary
A conductive unit (10) electrically connected to a bracket (2) has a smaller electrical resistivity than the bracket (2) and a navigation chassis (3), and guides a noise current, generated in a disc reproducing unit (1) and conducted to the bracket (2), to a coupling unit (7) via a rear chassis (5).