Vehicle Microphone Buffeting Mitigation via Speaker Relay Switching
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Solution Overview
Problem
HVAC-induced buffeting in vehicles interferes with the ability of voice-activated systems to interpret voice commands due to airflow deflecting and distorting the microphone diaphragm, reducing signal quality.
Innovation Solution
A buffeting detector is used to determine a buffeting factor by analyzing the low-frequency content and fluctuation strength of the microphone signal, activating a relay to switch the audio input from the microphone to a speaker when the buffeting factor exceeds a threshold, allowing the speaker to act as a microphone and improve voice command interpretation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a microphone is used for voice input in a vehicle, then voice-activated systems can interpret voice commands, but HVAC system operation causes airflow to deflect and distort the microphone diaphragm, reducing signal quality
Solution Approach 1:
The patent uses a speaker as an intermediary device to capture voice input when the microphone is affected by HVAC buffeting. The speaker acts as a substitute input device, receiving voice commands through acoustic coupling rather than direct microphone capture, thereby bypassing the harmful airflow effects on the microphone diaphragm.
Solution Approach 2:
The system dynamically changes the operational parameters by switching between different input devices (microphone and speaker) based on detected buffeting conditions. When buffeting is detected, the system changes the active input parameter from microphone to speaker, adapting to the harmful environmental conditions.
2Device complexity
If the microphone signal is used directly for voice activation, then the system remains simple, but signal quality deteriorates under HVAC airflow conditions
Solution Approach 1:
The system implements dynamic switching capability between microphone and speaker inputs based on real-time buffeting detection. This dynamic adaptation allows the system to maintain optimal signal quality by selecting the appropriate input device according to current HVAC operational conditions, rather than using a fixed microphone-only approach.
Solution Approach 2:
The speaker is given a dual function: its primary function remains audio output, and its secondary function serves as an alternative voice input device when buffeting occurs. This multi-functionality allows the system to handle both normal and HVAC-affected conditions without adding entirely separate dedicated input hardware.
3Reliability
If a buffeting detection system with relay switching is implemented, then voice input reliability improves under HVAC conditions, but device complexity increases
Solution Approach 1:
The system implements a feedback mechanism where the buffeting detection analysis continuously monitors microphone signal quality and triggers automatic switching to the speaker input when degradation is detected. This closed-loop feedback ensures reliable voice input by automatically responding to changing environmental conditions without requiring manual intervention.
Solution Approach 2:
The relay serves as an intermediary switching mechanism that automatically connects or disconnects the speaker from the audio input circuit based on buffeting detection. This intermediary component enables automatic adaptation between input devices while maintaining system manageability through centralized control logic.
Data Source
AI summary
Method and apparatus are disclosed for responding to HVAC-induced vehicle microphone buffeting. An example disclosed vehicle includes a microphone, a speaker, and a buffeting detector. The example microphone is electrically coupled to an input of a voice-activated system. The example speaker is located on a front driver side of the vehicle. The example buffeting detector, when a button is activated, determines a buffeting factor of a signal captured by the microphone. Additionally, the example buffeting detector, in response to the buffeting factor satisfying a threshold, activates a relay to electrically couple the speaker to the input of the voice-activated system.