Vehicle Cabin Audio Compensation for Road Noise and Speech Leakage
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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 locations within the vehicle, which degrade the fidelity of audio content delivered to specific seating positions, especially in vehicles with multiple rows of seats.
Innovation Solution
An audio system with a second microphone assembly and audio signal processing circuitry that detects and filters out perturbing signals by applying beamforming configurations and volume-based equalization to isolate and attenuate unwanted noise and speech content, ensuring clear audio delivery to intended seating positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional vehicle audio systems deliver common audio content to all passengers, then the system complexity is low, but the audio fidelity is degraded by perturbing signals such as road noise and leaked audio content
Solution Approach 1:
The audio system is segmented into multiple independent audio zones, each with its own speaker and microphone assembly positioned at specific seating locations. This allows independent audio processing and noise cancellation for each seating position, improving audio fidelity without requiring complete system redesign
Solution Approach 2:
Microphone assemblies are introduced as intermediary devices to detect perturbing signals (road noise, leaked audio content, speech) at each seating position. These microphones capture the acoustic environment, enabling the system to identify and cancel unwanted sounds before they degrade audio fidelity
2Reliability
If modern vehicle audio systems customize audio content for each seating position, then audio fidelity improves, but device complexity increases due to multiple speakers and processing requirements
Solution Approach 1:
The system merges audio playback and noise cancellation functions into a unified processing architecture. The same speaker assemblies that deliver customized audio content also serve as noise cancellation actuators, while microphone assemblies serve both speech detection and ambient noise monitoring functions, reducing overall system complexity
Solution Approach 2:
The system dynamically adjusts audio signal parameters (frequency, amplitude, phase) based on detected perturbing signals and seating position. By changing signal parameters in real-time rather than adding physical components, the system maintains high audio fidelity with controlled complexity
3Measurement precision
If multiple microphone assemblies are added to detect speech content from different seating positions, then speech isolation improves, but device complexity and cost increase
Solution Approach 1:
Each microphone assembly is optimized for its specific seating position with directional sensitivity tailored to that location. The first microphone assembly detects speech from the first seating position while the second detects speech from the second seating position, with each assembly having local optimization for its specific spatial context, improving detection accuracy without requiring omnidirectional coverage from all microphones
4Measurement precision
If beamforming configurations are applied to attenuate speech content from other locations, then speech isolation improves, but signal processing complexity increases
Solution Approach 1:
Beamforming configurations are pre-calculated and stored for different seating position combinations and vehicle conditions. Rather than computing complex beamforming weights in real-time, the system selects from pre-computed configurations based on current microphone signals and detected speech sources, reducing real-time processing complexity while maintaining speech isolation effectiveness
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 perturbing signals, maintaining audio content intelligibility and fidelity at intended locations within the vehicle, even in noisy environments.
Implementation Method 1
a first microphone assembly positioned to detect speech content originating from a first seating position
Implementation Method 2
select and apply a beamforming configuration to attenuate the second speech content detected by at least the first microphone assembly
Implementation Method 3
filter the leaked second audio content from the second speaker and the road noise to isolate the first speech content
Data Source
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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.