Speaker Waveguide Angled Apertures Coherent Sound Front
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Solution Overview
Problem
Professional audio systems face challenges in achieving a coherent sound wave front with both high frequency and midrange frequency drivers, particularly at larger angles, due to wave interferences and diffraction issues caused by midrange drivers' irregular surfaces and placement.
Innovation Solution
A speaker driver assembly with a waveguide having angled apertures that allow midrange frequency sound waves to pass through while minimizing diffraction of high frequency sound waves, ensuring the high frequency sound waves remain on their original path, with apertures configured to prevent constructive and destructive interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If midrange frequency drivers are placed adjacent to high frequency drivers in the same enclosure, then the system can integrate midrange and high frequency sound sources at high output levels, but wave interferences and diffraction from midrange driver surfaces create inconsistencies in the wave front and frequency response
Solution Approach 1:
The patent extracts the midrange drivers from the main acoustic path by placing them behind the waveguide structure. The waveguide walls are positioned in front of the midrange drivers, allowing high frequency sound waves to travel along the waveguide surface while midrange drivers remain acoustically isolated from the primary high frequency propagation path, thus preventing their irregular surfaces from creating diffraction edges that would disrupt the wave front
Solution Approach 2:
The waveguide structure acts as an intermediary between the midrange and high frequency drivers. By positioning the waveguide walls between these drivers, the patent creates a controlled acoustic environment where high frequency waves can propagate smoothly along the waveguide surface while midrange drivers operate independently, preventing direct acoustic interaction that would cause wave interference and frequency response inconsistencies
2Area of stationary object
If sidewalls or waveguides are placed at 30-60 degrees to direct high frequency sound waves, then the horizontal listening area coverage is improved, but diffraction and wave interference increase at larger angles from the array
Solution Approach 1:
The patent applies local quality by creating a smooth, continuous waveguide surface specifically in the region where high frequency sound waves propagate. The waveguide walls are designed with smooth surfaces and appropriate angles (30-60 degrees) to direct sound coverage, while the midrange drivers are positioned behind these walls, ensuring that only the necessary portions of the structure interact with high frequency waves, thereby minimizing diffraction and maintaining sound fidelity across the listening area
3Adaptability or versatility
If midrange drivers have irregular surfaces to handle midrange frequencies, then midrange sound reproduction is achieved, but diffraction edges and cavities are created that cause reflections and wave cancellations
Solution Approach 1:
The patent extracts midrange drivers from the high frequency acoustic path by positioning them behind the waveguide walls. This extraction allows midrange drivers to have the irregular surfaces necessary for effective midrange frequency reproduction without creating diffraction edges and cavities in the high frequency sound path, thereby eliminating the harmful reflections and wave cancellations that would otherwise occur
Solution Approach 2:
The patent creates a simplified acoustic model where midrange drivers are acoustically isolated from the high frequency propagation path. By copying the successful approach of separating different frequency ranges into distinct acoustic zones, the patent eliminates the harmful interactions between midrange driver surfaces and high frequency sound waves, allowing each frequency range to be reproduced optimally without interfering with the other
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 achieves a consistent and coherent wave front across a wide frequency response area, improving sound fidelity and clarity even at larger angles from the loudspeaker array.
Implementation Method 1
Sound radiating from the high frequency driver will generally radiate in all directions unless directed by waveguides or sidewalls
Implementation Method 2
apertures configured to prevent constructive and destructive interference
Implementation Method 3
apertures configured to prevent constructive and destructive interference
Data Source
AI summary
A speaker driver assembly for use in a speaker system is provided. The speaker driver assembly includes at least one centrally located high frequency sound driver and at least one mid-range frequency sound driver located to either side of the high frequency sound driver. A waveguide wall in the front of the speaker driver assembly directs the high frequency sound waves outwards from a centrally located opening. The waveguide wall has a plurality of small apertures in front of each mid-range frequency driver that are angled outwardly to allow mid-range sound waves to pass through the apertures while minimizing diffraction of high frequency sound waves passing by the apertures in order to generate a coherent sound wave front.