Vehicle Microphone Array for Sudden Cabin Noise Suppression
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Solution Overview
Problem
Existing vehicle cabin noise suppression systems fail to adequately attenuate sudden noise inputs during hands-free audio calls, leading to disruptive noise transmission to recipients.
Innovation Solution
A method employing a heterogeneous microphone arrangement comprising hands-free audio microphones and active-noise canceling microphones, with a noise cancellation module that applies a first suppression procedure and a secondary procedure if necessary to normalize sudden cabin noise, using techniques like array mixing and noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional noise suppression systems are used, then general cabin noise is reduced, but sudden noise disturbances are not effectively attenuated and are mixed with desired audio
Solution Approach 1:
The system segments the audio signal processing into multiple stages: first suppression procedure and second suppression procedure. Each procedure targets different aspects of noise, with the first handling general cabin noise and the second specifically addressing sudden noise disturbances, thereby resolving the contradiction between general noise reduction and sudden noise attenuation effectiveness
Solution Approach 2:
The system introduces an intermediary component - the second suppression procedure - that acts as a mediator between the first suppression procedure and the final audio output. This intermediary specifically targets sudden noise disturbances that escape the first procedure, ensuring both general noise reduction and reliable sudden noise attenuation
2Device complexity
If a single suppression procedure is applied, then the system remains simple, but it cannot adequately handle both general cabin noise and sudden noise disturbances
Solution Approach 1:
The system implements dynamic suppression procedures that adapt to different noise conditions. The first suppression procedure operates continuously for general cabin noise, while the second suppression procedure is dynamically activated when sudden noise disturbances are detected, creating a flexible multi-stage approach that handles both noise types effectively
Solution Approach 2:
The system employs periodic evaluation of audio signals to determine when to apply the second suppression procedure. By continuously monitoring for sudden noise disturbances and applying the second procedure periodically when needed, the system achieves comprehensive noise suppression without requiring the second procedure to run continuously, balancing complexity and effectiveness
Data Source
AI summary
A vehicle audio quality system for suppressing sudden vehicle cabin noise is provided, as well as methods of using the system. The system includes: an arrangement of heterogeneous microphones and a noise cancellation module (NCM). The microphone arrangement includes: a first microphone and a plurality of secondary microphones. The NCM includes a controller and a non-transitory computer-readable medium for storing application software executable by the controller to improve the quality of desired cabin audio received by the first microphone, the software performing the steps of: receiving a desired audio input from the first microphone; receiving supplemental audio input via the plurality of secondary microphones that includes a sudden cabin noise input; and applying a suppression procedure to the sudden cabin noise input.