Auxiliary Interface Device for Automotive Audio Signal Selection
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Solution Overview
Problem
Automobile audio system head units are limited in selecting additional signal sources beyond their original capabilities, often requiring complex user interactions and digital remote control protocols, and are prone to interference from vehicle electrical systems, which complicates the integration of external devices like MP3 players and DVD players.
Innovation Solution
An auxiliary interface device that connects to the head unit's signal output, detects special signals, and substitutes auxiliary signals to bypass the head unit's signal processing, allowing selection and processing of additional sources with improved fidelity and interference reduction, using electronic circuits and signal processing to emulate the head unit's controls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional signal sources are integrated through OEM head units, then signal source versatility is improved, but device complexity and interference susceptibility increase
Solution Approach 1:
The patent introduces an auxiliary interface device as an intermediary between the head unit and additional signal sources. This mediator handles the complexity of protocol conversion and signal conditioning externally, allowing the head unit to remain simple while gaining expanded signal source capabilities through the auxiliary device's intervention layer.
2Adaptability or versatility
If additional signal sources are integrated through OEM head units, then signal source versatility is improved, but susceptibility to electrical interference increases
Solution Approach 1:
The auxiliary interface device serves as an intermediary that conditions signals before they reach the head unit, filtering and isolating them from electrical interference generated by the vehicle's electrical system. This mediator protects the sensitive audio processing in the head unit from harmful electrical noise.
Solution Approach 2:
The patent segments the audio system into distinct functional modules: the head unit for core audio processing, and the auxiliary interface device for signal acquisition and conditioning. This segmentation isolates the head unit from interference sources while allowing additional signal sources to be integrated through the protected auxiliary interface.
3Adaptability or versatility
If head unit signal processing is applied to additional sources, then signal compatibility is improved, but audio fidelity deteriorates
Solution Approach 1:
The auxiliary interface device acts as an intermediary that provides raw, unprocessed signals from additional sources directly to the audio output, bypassing the head unit's signal processing electronics. This allows high-fidelity audio transmission while maintaining compatibility through the mediator's interface functionality.
Data Source
AI summary
An auxiliary interface device, comprising an electronic circuit to interface to the signal output of a signal source, said signal source developing or receiving more than one signal, and providing for the user selection of at least one of the signals in deference to the others so that said apparatus provides for the selection of at least one special signal having predetermined characteristics, a detector which recognizes the presence of the at least one said special signal when present or part of a signal developed by the apparatus to which said auxiliary interface device is connected, said detector being able to distinguish between said at least one special signal and other signals ordinarily present or developed by the apparatus to which said auxiliary interface device is interfaced, a signal switch to substitute at least one auxiliary signal in place of a signal output by the apparatus to which said auxiliary interface is interfaced, said signal switch being configured to substitute said at least one auxiliary signal for the signal normally developed by said apparatus to which said auxiliary interface device is interfaced when said detector recognizes the presence of the at least one special signal in the signal normally developed by said apparatus to which said auxiliary interface device is interfaced.