Tweeter Array Loudspeaker for Uniform Sound Coverage
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Solution Overview
Problem
Conventional loudspeaker systems often result in uneven sound distribution due to the spherical dispersion of low-frequency sound waves and linear propagation of high-frequency sound waves, leading to listeners only hearing high frequencies when seated directly in line with the speaker, while low frequencies are dispersed and inaudible.
Innovation Solution
A woofer-less and enclosure-less loudspeaker system utilizing multiple tweeter drivers placed at angularly equal distances to create a uniform sound field, where high frequencies are evenly spaced and low frequencies are reinforced by adjacent drivers, with optional reflectors to manage sound shadow areas and a carrier wave generator for modulating electrical signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional loudspeaker systems use a single tweeter driver, then high frequency sound propagates along the axis of the driver, but low frequency sound disperses spherically and becomes inaudible to listeners not positioned directly in line with the speaker
Solution Approach 1:
The patent divides the sound generation function into multiple tweeter drivers arranged in an array, where each driver handles a specific spatial sector. This segmentation allows the system to cover all directions with high-frequency sound while low-frequency components from multiple drivers combine to provide omnidirectional coverage, resolving the contradiction between directional high-frequency propagation and omnidirectional low-frequency dispersion.
2Illumination intensity
If multiple tweeter drivers are used to cover all frequency ranges, then uniform sound coverage is achieved, but the system becomes more complex
Solution Approach 1:
The patent makes tweeter drivers perform multiple functions by arranging them in a specific geometric configuration where they collectively handle both high-frequency directional propagation and low-frequency omnidirectional dispersion. Each tweeter driver maintains its primary high-frequency function while the array configuration enables low-frequency coverage through constructive interference, eliminating the need for separate woofer drivers and simplifying the overall system.
3Illumination intensity
If tweeter drivers are arranged to propagate high frequency sound along their axes, then high frequency coverage is improved, but low frequency sound becomes dispersed and thin
Solution Approach 1:
The patent merges the output from multiple tweeter drivers in a spatial array configuration, where the high-frequency components maintain their directional propagation characteristics along each driver's axis while the low-frequency components from all drivers combine constructively. This merging effect creates a uniform sound field where both high and low frequencies are evenly distributed throughout the listening area, resolving the contradiction between directional high-frequency propagation and omnidirectional low-frequency coverage.
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 system provides uniform sound coverage in all directions, eliminating the need for a woofer and enclosure, ensuring consistent sound quality regardless of listener position and allowing for compact designs without sound coloration, while the ultrasound carrier wave enables the reproduction of DC signals and low frequencies.
Implementation Method 1
The sound wave exerted by the diaphragm travels in a peculiar way: the low frequency sound wave disperses spherically while the high frequency propagates along the line of axis of the tweeter driver
Implementation Method 2
a support structure for arranging the plurality of drivers in such a way that the axis extending from the rear face of each of the drivers converge in a single point in space
Implementation Method 3
the low frequency components from each driver are reinforced by the low frequency components of adjacent drivers
Implementation Method 4
the high frequency components are reflected back toward the front face creating an acoustic shadow behind the at least one reflector
Implementation Method 5
the low frequency components are diffracted to fill the acoustic shadow area behind other reflectors
Implementation Method 6
a carrier wave generator for generating a carrier wave of ultrasound frequency, wherein an input electrical sound signal is superimposed on the carrier wave before being input to the plurality of drivers
Data Source
AI summary
A woofer-less and box-less loudspeaker system including a plurality of tweeter drivers is provided. The speaker system includes a plurality of drivers, each driver including a front face and a rear face with an axis of symmetry, each driver configured for propagating sound energy along the axis of each driver from the front face, wherein the sound energy includes low frequency and high frequency components; and a support structure for arranging the plurality of drivers in such a way that the axis extending from the rear face of each of the drivers converge in a single point in space, wherein as the sound is propagated along the axis of each driver from the front face, the high frequency components from each driver are evenly spaced and the low frequency components from each driver are reinforced by the low frequency components of adjacent drivers.