Omnidirectional Siren Array with Exponential Waveguides
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Solution Overview
Problem
Existing omnidirectional outdoor sirens face issues with performance degradation due to sharp discontinuities in the acoustic wavefront path, difficulty in servicing, and limited sound distribution, as well as mechanical complexity and inefficiency in sound energy transmission.
Innovation Solution
The design features an exponentially increasing cross-sectional area sound wave path with radially opposed manifolds and dual compression drivers for improved sound distribution, ease of servicing, and reduced mechanical complexity, allowing for enhanced low-frequency performance and voice intelligibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a single high-power driver is used in each module, then the siren output is powerful, but the weight increases and servicing becomes difficult
Solution Approach 1:
The patent divides each module into multiple acoustic waveguides (typically 4), with each waveguide containing its own compression driver. This segmentation allows individual drivers to be accessed and serviced independently through the modular structure, eliminating the difficulty of servicing a single large centralized driver while maintaining high overall power output through the combined output of multiple drivers.
2Strength
If vertical support posts are positioned around the peripheral edge, then structural strength is provided, but the acoustic wavefront path creates discontinuities
Solution Approach 1:
The patent extracts the support function from the peripheral region and relocates it to a central support structure. The vertical support posts are repositioned to a central location rather than being distributed around the peripheral edge, removing them from the acoustic wavefront path and eliminating the discontinuities they caused, while still providing the necessary structural strength for the module.
3Volume of moving object
If a short horn channel is used, then the module size is reduced, but the sound energy transmission efficiency decreases
Solution Approach 1:
The patent transitions from a traditional horizontal horn channel layout to a vertical horn channel configuration. The acoustic waveguides extend vertically from the compression drivers to the module output, utilizing the vertical dimension rather than extending horizontally. This dimensional change allows for more efficient sound energy transmission within a compact module volume, as the vertical orientation optimizes the horn loading and acoustic impedance matching.
4Strength
If multiple tools are required to remove bolts, then assembly is secure, but servicing time increases
Solution Approach 1:
The patent extracts the fastening function from complex multi-tool bolt connections and replaces it with a simpler single-tool fastening mechanism. The modular design incorporates fastening systems that can be assembled and disassembled with a single tool, maintaining secure assembly while dramatically reducing the time and complexity of servicing operations.
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
This design enhances sound distribution and low-frequency performance, reduces mechanical complexity for easier servicing, and improves voice intelligibility by maintaining a smooth acoustic wavefront path and minimizing vertical space between modules, resulting in improved overall siren performance and manufacturability.
Implementation Method 1
Each acoustic waveguide contains a compression driver that outputs sound energy
Implementation Method 2
sound energy travels from each driver, through its respective manifold, and is then directed downward to an opening in the module
Data Source
AI summary
A high-power omnidirectional electronic speaker array (or “siren”) having a variable number of circular chambers vertically arranged on a rigid mast. Each chamber, or module, contains one or more manifolds that serve as waveguides for the sound energy emanating from audio compression drivers. Each manifold combines the output of two or more compression drivers into a single source, and maintains a smoothly and exponentially increasing cross-sectional area for the full length of the waveguide to an output port located close to the center of the module. The curved external surfaces of the upper and lower sections of adjacent modules continue the exponentially-increasing cross-sectional area to create a horn-shaped final output mouth for the sound energy. The separation between vertically adjacent exiting surfaces of multiple modules is minimized for the purpose of improved intelligibility, maximum acoustic range, and lower distortion.