Acoustic Horn Interface Region for Stable Beam Angle
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Solution Overview
Problem
Existing acoustic horn designs face challenges in maintaining uniform directional characteristics and beam angles across the full audio frequency range when using multiple sound drivers, leading to off-axis cancellations and distorted sound fields due to path length differences and aperture interactions.
Innovation Solution
An acoustic horn arrangement with an interface region that minimizes changes in beam angle as a function of frequency, utilizing strategically located and oriented apertures, such as rectangular slits or tapered apertures, to combine sound from multiple drivers while reducing wavefront distortion and cavity resonance effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple sound drivers are used to cover the full audio frequency range, then the frequency coverage is improved, but the beam angle stability deteriorates due to off-axis cancellations and path length differences
Solution Approach 1:
The audio frequency range is segmented into different bands, with each sound driver (woofer, mid-range, tweeter) responsible for a specific segment. The interface region segments the acoustic paths to allow each driver's sound to enter the horn at optimized locations, reducing inter-driver interference while maintaining full frequency coverage
Solution Approach 2:
Different parts of the horn structure are given different properties: the interface region has specific aperture configurations (rectangular slits or tapered apertures) that differ from the main horn body. Each sound driver is positioned and oriented according to its frequency range, with local acoustic optimizations that collectively improve overall beam angle stability
2Reliability
If sound drivers are arranged in a vertical array, then the frequency response uniformity is improved, but the directional characteristics deteriorate due to vertical off-axis cancellations
Solution Approach 1:
The interface region acts as an intermediary between the vertically arranged sound drivers and the main horn. It mediates the acoustic interaction by providing controlled entry points through apertures, reducing direct interference between drivers while maintaining their individual frequency response contributions
Solution Approach 2:
The interface region introduces a new spatial dimension for acoustic interaction. Instead of direct vertical stacking interference, sound from multiple drivers enters the horn through apertures in the interface region, transforming the problem from a 1D vertical interference pattern to a 3D acoustic field that can be better controlled
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 more uniform and stable beam angle performance across the frequency range, reducing variations in vertical and horizontal beam angles, and enhancing the overall sound field distribution, similar to that of a simple acoustic horn without multiple drivers.
Implementation Method 1
an interface region where sound from the second sound driver transfers into the acoustic horn to combine with sound from the first sound driver
Implementation Method 2
the interface region is adapted to reduce changes in a beam angle measure of the acoustic horn as a function of frequency
Data Source
AI summary
An acoustic horn arrangement including an acoustic horn, a first sound driver operable to drive the acoustic horn and a second sound driver further operable to drive the acoustic horn. The acoustic horn arrangement also including an interface region where sound from the second sound driver transfers into the acoustic horn to combine with sound from the first sound driver, wherein the interface region is adapted to reduce changes in a beam angle measure of the acoustic horn as a function of frequency.