Vehicle Audio Zone Control with Reverse Phase Noise Cancellation
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Solution Overview
Problem
Existing audio apparatuses in vehicles can only reproduce a single audio signal across multiple speakers, failing to accommodate different audio preferences for passengers seated in various positions, leading to noise interference from vehicle movements and private audio signal exposure.
Innovation Solution
An audio apparatus with a receiving unit, signal processing unit, reverse phase signal generating unit, and controller that allows different audio signals to be processed and output to specific speakers, including reverse phase signals to minimize noise interference and maintain privacy during calls, with adjustable output levels and user-controlled settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple speakers are used to reproduce audio signals, then audio coverage is improved, but noise interference from vehicle movements increases and private audio exposure occurs
Solution Approach 1:
The audio system is segmented into multiple independent audio zones, with each speaker or group of speakers assigned to specific seating positions. This allows different audio signals to be reproduced in different spatial regions, enabling personalized audio experiences for each passenger while reducing cross-interference between zones.
Solution Approach 2:
Different audio characteristics and signals are applied to different local regions (seating positions) within the vehicle. Each seating position receives audio signals optimized for that specific location, with reverse phase signals applied locally to cancel noise in specific zones without affecting other areas.
2Illumination intensity
If multiple speakers reproduce the same audio signal, then audio coverage is improved, but passengers cannot listen to different audio signals based on their positions
Solution Approach 1:
The audio system divides the vehicle interior into multiple independent audio zones corresponding to different seating positions. Each zone can reproduce different audio signals simultaneously, allowing passengers to listen to different music, podcasts, or silence based on their preferred content, while the system manages multiple audio streams independently.
3Object-affected harmful factors
If reverse phase signals are output at high levels, then noise canceling effect is improved, but audio signal quality deteriorates due to excessive cancellation
Solution Approach 1:
The system dynamically adjusts the output level parameter of reverse phase signals based on the specific noise environment and audio content. By optimizing the amplitude parameter of cancellation signals, the system achieves effective noise reduction while preserving audio signal fidelity and avoiding over-cancellation artifacts.
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
Enables passengers to listen to different audio signals based on their positions within the vehicle, reducing noise interference and allowing private calls, thereby enhancing user convenience and audio experience.
Implementation Method 1
a technology of minimizing an influence of the noise due to the driving of the vehicle and allowing an original sound to be vividly heard using a noise canceling technology has been developed
Data Source
AI summary
An audio apparatus and method are provided. The method includes receiving, by a controller, first audio data and second audio data and processing the first audio data and the second audio data to generate first audio signals and second audio signals. Further, reverse phase signals of the first audio signals are generated by the controller. A first group of the plurality of audio outputting units output the first audio signals and a second group of the plurality of audio outputting units output the second audio signals and the reverse phase signals of the first audio signals.