Vehicle AVN Audio Noise Control Using GNSS Signal Strength
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Solution Overview
Problem
Vehicles face challenges in maintaining clear audio broadcasts due to low signal reception in weak electric field regions, leading to poor signal-to-noise ratios and excessive noise in audio signals.
Innovation Solution
A vehicle system incorporating a Global Navigation Satellite System (GNSS) antenna, a broadcast receiving antenna, and an Audio/Video/Navigation (AVN) device that automatically adjusts noise removal levels based on GNSS signal intensity, switching between different acoustic modes to optimize sound quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vehicle operates in a weak electric field region, then the broadcast signal reception is poor, but the noise in the acoustic signal increases significantly
Solution Approach 1:
The system dynamically adjusts the noise removal level based on real-time GNSS signal intensity measurements. When the vehicle enters a weak electric field region (detected by low GNSS signal intensity), the system automatically increases the noise removal level to compensate for degraded broadcast signal reception, thereby maintaining audio quality despite adverse environmental conditions
Solution Approach 2:
The system changes the operational parameters of the audio processing by adjusting the noise removal level according to the detected signal environment. The noise removal level is modified as a variable parameter in response to GNSS signal intensity, allowing the system to adapt its noise filtering characteristics to match the current reception conditions
2Object-affected harmful factors
If the noise removal level is increased to improve audio quality in weak signal areas, then the sound clarity improves, but the system complexity increases
Solution Approach 1:
The system implements a feedback mechanism where the noise removal level is automatically adjusted based on the detected GNSS signal intensity. The AVN device continuously monitors signal conditions and feeds this information back to modify the noise removal processing, eliminating the need for manual user intervention and simplifying operation despite the sophisticated adaptive processing
Solution Approach 2:
The system performs self-adjustment of noise removal levels without requiring user input. The AVN device autonomously detects signal strength conditions and automatically configures appropriate noise removal parameters, allowing the system to serve itself in optimizing audio quality across varying environmental conditions
Data Source
AI summary
A vehicle includes a Global Navigation Satellite System (GNSS) antenna, a broadcast receiving antenna, a speaker, and an Audio/Video/Navigation (AVN) device electrically connected to the GNSS antenna, the broadcast receiving antenna, and the speaker, and the AVN device is configured to obtain a broadcast signal from the broadcast receiving antenna, receive a GNSS signal from the GNSS antenna, demodulate the broadcast signal into an acoustic signal, and remove a noise mixed in the acoustic signal based on an intensity of the GNSS signal.