Vehicle Cabin Audio Compensation for Road Noise and Speech Leakage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional vehicle audio systems fail to effectively mitigate perturbing signals such as road noise, leaked audio content, and speech content from other seating positions, which degrade the audio fidelity and intelligibility for occupants, especially in vehicles with multiple rows of seats.
Innovation Solution
An audio system with microphone assemblies and audio signal processing circuitry that detects and filters out perturbing signals, using beamforming configurations and volume-based equalization to adjust the audio content delivered to each seating position, ensuring clear and intelligible audio despite interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional vehicle audio systems deliver common audio content to all passengers, then system complexity is low, but audio fidelity and intelligibility are degraded by perturbing signals
Solution Approach 1:
The audio system is segmented into multiple independent audio zones corresponding to different seating positions. Each zone has its own speaker and microphone assembly, allowing independent audio content delivery and perturbing signal detection for each seating position. This segmentation enables targeted compensation without requiring complex system-wide processing.
Solution Approach 2:
The system employs feedback mechanisms where microphone assemblies detect perturbing signals (road noise, leaked audio, speech content) and feed this information back to the audio signal processing circuitry. The processing circuitry then adjusts the audio signal in real-time to compensate for detected perturbations, maintaining audio fidelity despite environmental interference.
2Reliability
If modern vehicle audio systems customize audio content for each seating position, then audio fidelity is improved, but device complexity increases
Solution Approach 1:
Each seating position is equipped with its own speaker and microphone assembly, creating localized audio zones. The audio signal processing is performed independently for each seating position based on locally detected perturbing signals. This local quality approach allows customized audio content delivery with reduced complexity compared to centralized processing.
Solution Approach 2:
Each audio zone serves itself by detecting its own perturbing signals and adjusting its audio output independently. The microphone assembly at each seating position detects local perturbations, and the audio signal processing circuitry compensates for these perturbations without requiring intervention from other zones or complex centralized control.
3Reliability
If audio systems compensate for perturbing signals, then audio intelligibility is maintained, but device complexity increases due to additional microphone assemblies and processing circuitry
Solution Approach 1:
The compensation system is segmented into modular units where each seating position has its own microphone assembly and audio signal processing circuitry. This segmentation allows the compensation function to be implemented with minimal additional complexity at each zone rather than requiring complex system-wide processing.
Solution Approach 2:
The system uses feedback from locally detected perturbing signals to adjust audio output in real-time. The microphone assemblies provide continuous feedback about the acoustic environment, and the audio signal processing circuitry uses this feedback to dynamically compensate for perturbations, maintaining intelligibility with relatively simple processing.
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 system significantly improves the listening experience by isolating and attenuating unwanted noise and speech content, maintaining audio fidelity and intelligibility at intended seating positions within the vehicle.
Implementation Method 1
a first microphone assembly positioned to detect first speech content originating at the second seating position, leaked second audio content from the second speaker, and road noise
Implementation Method 2
the audio signal processing circuitry is coupled to the first microphone assembly and configured to determine a perturbing signal based at least in part on a combination of the first speech content, the leaked second audio content from the second speaker, and the road noise
Implementation Method 3
a first speaker positioned to provide first audio content to a first seating position within a vehicle cabin based on an audio signal received from an audio signal source
Data Source
AI summary
Audio systems and methods for providing intelligible audio content within a vehicle cabin. In one example, the audio system includes a first speaker to provide first audio content to a first seating position based on an audio signal received from an audio signal source, a second speaker to provide second audio content to a second seating position, a first microphone assembly positioned to detect speech content originating at the second seating position, leaked second audio content from the second speaker, and road noise, and audio signal processing circuitry configured to determine a perturbing signal based at least in part on a combination of the first speech content, the leaked second audio content, and the road noise, and adjust the audio signal to the first speaker to compensate for an effect of the perturbing signal on the first audio content at the first seating position.