Chair Speaker Layout for Localized Sound and Leakage Control
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Solution Overview
Problem
Existing chair designs with built-in speakers fail to adequately reduce sound leakage to the surroundings, particularly in the forward direction, and cannot effectively control sound pressure and gradient at the boundary of the listening zone due to limitations in speaker arrangement and phase difference.
Innovation Solution
An acoustic system for chairs with eight speakers, including inward- and outward-facing speakers, and a sound field control processor to process signals for local reproduction within a predetermined zone, minimizing sound pressure and gradient at the boundary to reduce leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If sound insulation members are added to reduce sound leakage, then sound insulation performance is improved, but device complexity increases
Solution Approach 1:
The patent replaces passive mechanical sound insulation members with an active electronic sound field control system. Instead of using physical barriers to block sound, the system uses multiple speakers to generate anti-phase sound waves that actively cancel leakage sound through destructive interference, thereby reducing sound leakage without adding mechanical insulation structures.
Solution Approach 2:
The patent changes the phase parameter of sound waves by controlling the timing and polarity of signals sent to different speakers. By adjusting the phase relationship between sounds from multiple speakers, the system creates regions of constructive and destructive interference to control sound propagation directions, enabling sound leakage reduction through parameter control rather than structural modification.
2Manufacturing precision
If the number of speakers is increased to improve sound field control, then sound field control precision is improved, but device complexity increases
Solution Approach 1:
The patent divides the sound field control function into multiple independent speaker units, each responsible for specific spatial zones. By segmenting the speaker array and assigning specific control functions to each speaker, the system achieves precise sound field control at the boundary zones while maintaining manageable system complexity through modular functional distribution.
Solution Approach 2:
The patent makes each speaker serve multiple functions: reproducing listening target sound for the user, generating anti-phase sound for leakage cancellation, and contributing to overall sound field control. This multi-functionality allows the system to achieve precise sound field control with a unified speaker system rather than requiring separate dedicated components for each function.
3Manufacturing precision
If speaker volume is increased to improve sound pressure at boundary, then sound field control is improved, but sound leakage increases
Solution Approach 1:
The patent applies preliminary anti-action by generating anti-phase sound waves before the leakage sound propagates outward. The system predicts and counteracts sound leakage by emitting canceling sounds in advance from strategically positioned speakers, creating destructive interference that prevents leakage sound from propagating outside the chair zone, rather than attempting to contain high-volume sound after it is generated.
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
Effectively reduces sound leakage from the chair's surroundings by ensuring sound pressure and gradient are minimized at the boundary, allowing for localized sound reproduction and improved listening experience.
Implementation Method 1
an interference sound field of each speaker's sound creates a sound field where the sound pressure and the sound pressure gradient of the listening target sound become zero
Implementation Method 2
a sound insulation member reduces sound leakage to the outside
Data Source
AI summary
An acoustic system for a chair, the acoustic system includes the chair, a support member configured to be arranged on a side of a head of a user when in use, an inward-facing speaker supported by the support member, configured to emit sound toward an inside of the chair in a left-right direction of the chair, an outward-facing speaker supported by the support member, configured to emit sound toward an outside of the chair in the left-right direction of the chair, and a sound field control processor configured to process a signal of a listening target sound, which is intended to be heard by the user when in use, to enable local reproduction of the listening target sound within a predetermined zone surrounding the chair, and to output the processed signal to the inward-facing speaker and the outward-facing speaker.