Car Audio Zone Separation via Bass Enhancement
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Solution Overview
Problem
Car audio systems face challenges in generating distinct listening zones within a car cabin due to acoustic interaction or 'crosstalk' between zones, which compromises the acoustic separation and distinctiveness of each zone.
Innovation Solution
A method involving a car audio system with strategically arranged audio output devices and signal processing to define specific listening and non-listening zones, where the frequency response is modified to apply bass enhancement, reducing crosstalk by increasing the acoustic separation between zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If audio output devices are arranged to define multiple listening zones in a car cabin, then the ability to provide spatially separated audio experiences is improved, but acoustic crosstalk between zones increases
Solution Approach 1:
The patent applies local quality by directing audio signals with zone-specific characteristics to specific listening zones. Each audio output device emits sound with tailored frequency content and spatial directionality, creating locally optimized acoustic environments. The audio signal is processed to have different spectral and spatial properties for different zones, allowing each zone to maintain its acoustic distinctiveness while reducing crosstalk interference.
Solution Approach 2:
The patent segments the audio signal into multiple frequency bands, each directed to different listening zones. By dividing the audio spectrum and spatial distribution into separate segments, the system can control which frequencies are heard in which zones. This segmentation reduces crosstalk by ensuring that each zone receives primarily its designated frequency content rather than a mixture from all zones.
2Manufacturing precision
If audio signals are directed to specific listening zones, then acoustic distinctiveness of zones is improved, but signal separation between zones becomes difficult
Solution Approach 1:
The patent changes audio signal parameters including frequency content, spatial distribution, and temporal characteristics to achieve zone-specific audio experiences. By modifying these parameters differently for each listening zone, the system creates acoustically distinct zones. The audio processing unit adjusts parameters such as frequency weighting, phase relationships, and amplitude distribution to optimize zone separation while managing processing complexity through efficient algorithms.
Data Source
AI summary
A method of reproducing an audio signal in a car cabin via a car audio system, the car audio system being configured to define at least one specific listening zone (LZ1, LZ2) of the audio signal for a specific listener position and a specific non-listening zone (NLZ1, NLZ2) of the audio signal for other listener positions within a car cabin, said car audio system comprising an audio signal source and a plurality of audio output devices associated with the audio signal source.