Dual Diaphragm Compression Driver for High SPL Acoustic Hailing
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Solution Overview
Problem
Conventional acoustic hailing systems face limitations in power density and efficiency, requiring increased size and number of drivers to achieve higher sound output, which restricts their portability and deployment in harsh environments.
Innovation Solution
The acoustic hailing device employs a pair of compression drivers with dual diaphragms oriented face-to-face, coupled with waveguide housings and amplifiers within a compact, environmentally sealed housing, allowing for increased power handling and output without adding more drivers, and features a ruggedized, water-resistant design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional acoustic hailing systems use direct radiators, then the device structure is simple, but the audible output level is low
Solution Approach 1:
The compression driver is segmented into multiple components: a diaphragm that vibrates to create pressure waves, a throat that channels the waves, and a horn that radiates the sound. This segmentation allows each component to be optimized for its specific function, achieving high audible output levels while maintaining a manageable device structure.
Solution Approach 2:
The patent introduces intermediate elements (throat and horn) between the diaphragm and the surrounding air. The throat acts as a mediator that transforms the diaphragm's vibration into directed pressure waves, while the horn further mediates by efficiently radiating these waves into the air, thereby significantly increasing audible output level.
2Illumination intensity
If the number of drivers is increased to achieve higher sound output, then the audible output level increases, but the device size and weight increase
Solution Approach 1:
The patent changes the operational parameters of a single compression driver by optimizing the diaphragm surface area, throat dimensions, and horn geometry. These parameter changes enable a single driver to achieve sound output levels that would traditionally require multiple drivers, thereby reducing device weight and improving portability.
3Illumination intensity
If the number of drivers is increased to achieve higher sound output, then the audible output level increases, but the device portability decreases
Solution Approach 1:
By optimizing the parameters of the compression driver (diaphragm area, throat size, horn length and shape), the system achieves high sound output levels in a compact configuration. This enables the device to remain portable and easy to deploy while delivering the required audible output for hailing applications.
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 configuration achieves a 6 Decibel increase in Sound Pressure Level (SPL) and improved frequency response, providing superior power density and efficiency in a compact, portable system suitable for harsh environments.
Implementation Method 1
Drivers that convert an electrical signal into acoustical energy or sound waves in order to radiate the sound waves into air have been used for some time.
Implementation Method 2
In an indirect radiator, the diaphragm moves against a surface closely spaced thereto and generates high pressure compression waves which are passed through a throat and to a horn or other acoustic generator
Data Source
AI summary
An acoustic hailing device includes an outer housing and a pair of compression drivers oriented in the outer housing adjacent one another. Each of the compression drivers includes two diaphragms oriented facewise relative to one another within each compression driver. One or more waveguide housings are coupled to the outer housing, the one or more waveguide housings forming a portion of a waveguide associated with each of the compression drivers. A pair of driver covers are each coupleable to one of the compression drivers, each of the driver covers forming another portion of the waveguide associated with each of the compression drivers.