In-Vehicle Noise Control via Spatial Audio Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Passengers in vehicles experience reduced satisfaction and increased fatigue due to distracting noises like navigation sounds when trying to listen to audio content, as existing noise control methods are ineffective in separating audio spaces within vehicles.
Innovation Solution
An in-vehicle noise control system that includes multiple speakers, an audio module capable of generating noise offset waveforms based on speaker positions, and an amplifier, which outputs navigation guidance sound to the driver's seat while providing noise-free audio content to passenger seats using DIRANA technology for noise cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If navigation guidance sound is reproduced through speakers in the vehicle, then driver convenience is improved, but passenger audio listening environment deteriorates due to noise distraction
Solution Approach 1:
The vehicle interior acoustic space is segmented into driver zone and passenger zone through beamforming technology. The navigation guidance sound is directed specifically to the driver's position while preventing propagation to passenger areas, thus maintaining driver convenience without disturbing passengers who want to listen to audio content.
Solution Approach 2:
Different acoustic qualities are provided to different spatial locations within the vehicle. The driver's position receives navigation guidance sound with appropriate characteristics, while passenger positions are provided with noise-free audio content environment through localized sound field control using multiple speakers and beamforming.
2Object-affected harmful factors
If beamforming technique is applied to separate audio spaces, then passenger noise control is improved, but fundamental noise problem persists
Solution Approach 1:
The harmful navigation guidance sound is extracted and selectively removed from passenger audio zones while preserving it in the driver zone. The audio module identifies and separates the navigation sound component from the overall audio output, applying beamforming to direct it only to the driver, thereby fundamentally solving the noise problem rather than merely mitigating it.
3Manufacturing precision
If multiple speakers are used to output audio content, then audio quality is improved, but noise distribution to passengers increases
Solution Approach 1:
The system transitions from conventional omnidirectional sound distribution to three-dimensional spatial audio control. By utilizing multiple speakers positioned throughout the vehicle and applying beamforming algorithms, the system creates directed sound paths that maintain high audio quality at the driver's position while controlling noise distribution to passengers through precise spatial management.
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
Enhances the audio listening environment by effectively canceling navigation guidance sounds and other in-vehicle noises, allowing passengers to enjoy audio content without distractions, thereby improving listening satisfaction and reducing fatigue.
Implementation Method 1
an audio module configured to receive the navigation guidance sound and an audio content signal, to generate an opposite waveform with respect to the navigation guidance sound and to output noise offset waveforms
Data Source
AI summary
An in-vehicle noise control system is provided. The system includes speakers that output navigation guidance sound and audio content reproduced at a head unit of a vehicle. An audio module receives the navigation guidance sound and an audio content signal to generate an opposite waveform with respect to the navigation guidance sound and output noise offset waveforms in which tuning functions are calculated based on positions of the speakers to the opposite waveform. An amplifier is connected between the audio module and the speakers. The audio module outputs the navigation guidance sound and the audio content signal to one of the speakers located at a driver's seat and outputs the noise offset waveforms and the audio content signal to the remaining speakers.