Display Speaker Waveguide for Destructive Interference Control
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Solution Overview
Problem
Existing display devices with slim designs face sound quality degradation due to destructive interference from speakers with elongated shafts, which affect response characteristics.
Innovation Solution
Incorporating a waveguide with path change members, such as slits or extensions, to adjust frequency bands and extend sound paths, reducing interference and improving acoustic characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a speaker with an elongated shaft is used in a slim display device, then the overall device thickness is minimized, but sound quality degradation occurs due to destructive interference
Solution Approach 1:
A waveguide structure is introduced as an intermediary component between the speaker and the display device front surface. The waveguide includes a throat tube connected to the speaker and a guide tube extending toward the front, with path change members (slits or extensions) that modify sound wave propagation. This intermediary structure enables proper sound wave guidance and interference control while accommodating the slim design constraints.
Solution Approach 2:
The path change members (slits or extensions) in the waveguide alter the physical parameters of sound wave propagation by changing the effective path length and wavefront shape. This modifies the phase and frequency characteristics of the sound waves, transforming the destructive interference pattern into a more favorable distribution that maintains sound quality in the slim device configuration.
2Length of stationary object
If the speaker shaft length is reduced to achieve slim design, then device thickness is minimized, but response characteristics and frequency response become degraded
Solution Approach 1:
Instead of extending the speaker shaft in the thickness direction (one dimension), the waveguide extends the sound transmission path in a different spatial dimension, utilizing the lateral space within the display device. The guide tube and path change members create an extended acoustic pathway that compensates for the reduced speaker shaft length without increasing device thickness.
3Object-affected harmful factors
If a waveguide with path change members is added, then sound quality and frequency response are improved, but device complexity increases
Solution Approach 1:
The waveguide is segmented into functional components: a throat tube connected to the speaker, a guide tube extending toward the front, and path change members (slits or extensions) positioned at specific locations. This segmentation allows each component to perform its specific function while maintaining overall simplicity and manufacturability.
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 enhances sound quality by minimizing interference, providing even frequency response across a wide range without significant degradation, particularly avoiding frequencies easily recognized by users.
Implementation Method 1
sound quality degradation due to destructive interference from speakers with elongated shafts
Implementation Method 2
configured to receive the sound generated from the speaker through one end of the guide tube and output the received sound
Implementation Method 3
a waveguide disposed between the speaker and the guide tube, in which the waveguide may include a throat tube configured to connect the speaker and the guide tube
Data Source
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AI summary
A sound output device according to the present disclosure comprises: a speaker for generating sound; a guide tube which is formed in a hollow tube shape, and which receives the sound generated by the speaker through one end thereof and outputs same; and a waveguide arranged between the speaker and the guide tube, wherein the waveguide connects the speaker with the guide tube, and includes a throat tube formed in a hollow tube shape, and at least one path change member for adjusting the preset frequency band of the sound during the transmission of the sound generated by the speaker to the guide tube.