Vehicle Headrest Speaker Layout for 3D Surround Sound
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Solution Overview
Problem
Providing a satisfying 3D surround sound experience for all passengers in a vehicle is challenging due to the need to consider various aspects and constraints when integrating speakers, particularly in ensuring each passenger receives optimal audio positioning.
Innovation Solution
An audio system with four loudspeakers arranged in a vehicle headrest, positioned to emit sound from above and below each ear on both sides, optimizing the 3D surround sound experience by directing sound towards the passenger's ears from specific angles, with each loudspeaker configured to receive audio signals from an audio unit and integrated into the headrest enclosure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If speakers are integrated into the vehicle to provide audio output, then audio functionality is achieved, but achieving a satisfying 3D surround sound experience for all passengers becomes difficult
Solution Approach 1:
The patent applies dimensionality change by positioning loudspeakers in three-dimensional space around the passenger's head (above, below, left, right) rather than traditional planar arrangements. This creates a spherical sound field that enables 3D surround sound experience, transforming the audio spatial arrangement from 2D to 3D to achieve superior adaptability for immersive audio.
Solution Approach 2:
The audio system is segmented into multiple independent loudspeakers (at least four: above-left, above-right, below-left, below-right) distributed in space, with each loudspeaker handling specific spatial audio channels. This segmentation allows independent control of sound from different directions, achieving complex 3D surround sound effects while maintaining manageable system complexity through modular speaker units.
2Adaptability or versatility
If multiple loudspeakers are arranged in the headrest to optimize 3D surround sound, then listening experience is improved, but the device complexity and integration challenges increase
Solution Approach 1:
The headrest is designed with multi-functionality, serving both as a structural support component and as an integrated audio system housing. The headrest enclosure accommodates multiple loudspeakers and audio processing components, allowing a single component (headrest) to fulfill multiple functions: providing structural support, enabling 3D surround sound, and simplifying integration by consolidating audio elements within the existing headrest structure.
3Manufacturing precision
If loudspeakers are positioned above and below ears for optimal 3D sound, then audio positioning is optimized, but the manufacturing and installation complexity increases
Solution Approach 1:
The loudspeakers are pre-positioned within the headrest assembly during manufacturing, with precise spatial arrangement (above, below, left, right of the passenger's head) established in advance. This preliminary positioning ensures accurate spatial audio delivery without requiring complex real-time adjustment mechanisms, as the optimal 3D sound field geometry is built-in during assembly rather than requiring complex installation procedures.
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 solution provides a satisfactory 3D listening experience for each passenger by optimizing surround sound positioning, ensuring that audio from one passenger's loudspeakers does not significantly compromise the experience of others, and allows for integration into various vehicle configurations.
Implementation Method 1
each of the first, second, third, and fourth loudspeaker receives the audio signals from the audio unit and is configured to reproduce the audio signals
Data Source
AI summary
An audio system arranged in a listening environment in a vehicle comprises an audio unit configured to output audio signals, a first loudspeaker arranged in a first headrest of the vehicle, a second loudspeaker arranged in the first headrest, a third loudspeaker arranged in the first headrest, and a fourth loudspeaker arranged in the first headrest, wherein each of the first, second, third, and fourth loudspeaker receives the audio signals from the audio unit and is configured to reproduce the audio signals. Each of the first loudspeaker, the second loudspeaker, the third loudspeaker, and the fourth loudspeaker is arranged in predetermined positions within the headrest when a passenger is seated in front of the headrest.