Loudspeaker Wave Expansion Guide With Movable Flap
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Solution Overview
Problem
Public address systems face challenges in clearly reproducing high-frequency sounds in closed spaces due to reflections and interferences caused by the small wavelength of these sounds, leading to acoustic delays and reduced sound quality.
Innovation Solution
The system incorporates a loudspeaker with a movable flap in the wave expansion guide, allowing for adjustable directivity, which concentrates sound energy and reduces reflections by adjusting the solid transmission angle, and includes a second loudspeaker forming a one-dimensional array with independent flaps for enhanced sound distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high-frequency sounds are reproduced in a closed space, then the sound coverage is improved, but reflections and interferences occur due to small wavelength causing acoustic delays and reduced sound quality
Solution Approach 1:
The patent applies local quality by creating a directional sound beam with concentrated energy in the vertical plane through the expansion guide geometry, while allowing broader distribution in the horizontal plane. This localized concentration of acoustic energy in specific spatial directions reduces unwanted reflections and interferences in closed spaces while maintaining adequate sound coverage.
Solution Approach 2:
The patent implements dynamics through the movable flap mechanism that allows real-time adjustment of the solid transmission angle. This dynamic adjustment capability enables optimization of sound distribution patterns according to different acoustic environments, preventing harmful reflections and interferences by adapting the beam width to match the spatial characteristics of the reproduction area.
2Illumination intensity
If sound waves are distributed in a wide solid transmission angle, then sound coverage is improved, but energy density decreases causing acoustic delays and reduced sound quality
Solution Approach 1:
The expansion guide creates a non-uniform sound distribution pattern with high energy density concentrated in the vertical direction through its geometric configuration, while maintaining adequate horizontal coverage. This localized energy concentration prevents acoustic delays caused by low energy density, while the overall wide transmission angle ensures sufficient sound coverage.
Solution Approach 2:
The movable flap enables dynamic control of the trade-off between energy density and coverage area. By adjusting the flap position, the solid transmission angle is modified to concentrate energy when needed (improving energy density) or expand coverage when the environment requires broader distribution, thus dynamically optimizing the balance between these two parameters.
3Device complexity
If a fixed directivity configuration is used, then device complexity is reduced, but adaptability to different acoustic environments is limited
Solution Approach 1:
The patent applies dynamics by incorporating a movable flap mechanism that transforms a fixed directivity configuration into an adjustable one. The flap can be positioned at different angles to modify the solid transmission angle, enabling adaptation to various acoustic environments (open spaces, closed rooms, different audience distances) while adding only minimal mechanical complexity to the overall speaker system.
Solution Approach 2:
The invention implements parameter changes by allowing modification of the solid transmission angle parameter through flap adjustment. This single parameter change enables the speaker to adapt its radiation pattern to different acoustic environments, providing versatility without requiring complete redesign of the speaker configuration for each application scenario.
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 improves sound quality by minimizing interference and increasing energy density, providing superior sound reproduction in closed spaces by optimizing sound wave distribution and reducing acoustic delays.
Implementation Method 1
the expansion guide of the first loudspeaker includes at least one first mobile flap that can be moved by a movement made parallel to the first plane, with said solid transmission angle thus having a value that makes it capable of being adjusted by the movement of this first flap
Implementation Method 2
which has, at least projecting in a first plane, a form opening outwards from its input to its output for distributing, in a solid transmission angle, the sound waves coming from said expansion guide
Data Source
AI summary
The invention relates to a public address system including one or more loudspeakers, each of which is in particular equipped with a section for reproducing high-frequency sounds, including a wave expansion guide, which receives, at its input sound waves coming from a transducer and having, projecting in a plane, a form opening outwards from its input to its output for distributing, in a solid transmission angle, the sound waves coming from the expansion guide. According to the invention, the expansion guide includes one or more mobile flaps that can be moved by a movement made parallel to the plane, so as to enable the solid transmission angle of the sound waves to be adjusted.