Loudspeaker Apparatus with Vertical Unit for High-Frequency Directivity
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Solution Overview
Problem
Conventional loudspeaker apparatuses exhibit reduced directivity and insufficient acoustic energy at higher frequencies, resulting in a smaller listening area, particularly for high-frequency sounds.
Innovation Solution
The loudspeaker apparatus includes a first and second loudspeaker unit placed on a plane with axes extending in horizontal and vertical directions, where the second unit is directed vertically upward at an approximately 90° angle to the first unit, with their diaphragm centers following the formula Y=−aX+b, and connected with high pass filters having distinct cutoff frequencies to enhance high-frequency sound reproduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single loudspeaker unit is used for high-frequency sound reproduction, then the structure is simple, but the listening area is small and directivity is reduced
Solution Approach 1:
The loudspeaker system is segmented into multiple loudspeaker units (first, second, and third units) with different orientations. The first unit faces forward, the second unit faces upward at approximately 90 degrees, and the third unit faces forward. This segmentation allows each unit to contribute to high-frequency sound reproduction from different spatial directions, thereby expanding the overall listening area while maintaining structural feasibility
Solution Approach 2:
The patent introduces a vertical dimension by positioning the second loudspeaker unit to face upward at approximately 90 degrees relative to the first unit. This dimensional change enables high-frequency sound to be radiated not only in the horizontal plane but also in the vertical plane, significantly expanding the three-dimensional listening area and improving spatial sound distribution
2Area of stationary object
If multiple loudspeaker units are used to expand listening area, then the listening area increases, but the device complexity increases
Solution Approach 1:
Each loudspeaker unit is positioned and oriented to optimize its contribution to specific spatial zones. The first unit optimizes forward-facing high-frequency reproduction, the second unit optimizes upward and rearward coverage, and the third unit provides additional forward coverage. This local optimization allows the system to achieve broad listening area coverage without requiring excessive complexity in each individual unit
Solution Approach 2:
The multiple loudspeaker units are designed to reproduce high-frequency sound across different frequency bands through high-pass filters with different cutoff frequencies. This multi-functionality allows each unit to contribute to the overall high-frequency reproduction task, achieving expanded listening area while maintaining reasonable device complexity through functional distribution
3Adaptability or versatility
If loudspeaker units are placed at arbitrary positions, then installation is flexible, but acoustic energy distribution becomes unbalanced and interference occurs
Solution Approach 1:
The patent specifies precise positional parameters for each loudspeaker unit relative to the others. The second unit is positioned at approximately 90 degrees to the first unit, and the third unit is positioned at a specific distance and angle from the first unit. These parameter specifications ensure balanced acoustic energy distribution and prevent interference, while still allowing installation flexibility within the defined geometric relationships
4Device complexity
If high-frequency sound is reproduced with a single unit, then the system is simple, but acoustic energy becomes insufficient at high frequencies
Solution Approach 1:
The high-frequency sound reproduction task is segmented across multiple loudspeaker units, each equipped with high-pass filters. The first unit handles high frequencies above its cutoff frequency, the second unit handles high frequencies from its perspective, and the third unit provides additional high-frequency reinforcement. This segmentation distributes the acoustic energy generation across multiple sources, ensuring sufficient high-frequency power without requiring any single unit to be overly complex or powerful
Data Source
AI summary
A loudspeaker apparatus includes a first loudspeaker unit and a second loudspeaker unit that reproduce sound at least at a high frequency. The first loudspeaker unit and the second loudspeaker unit are placed on a plane having an axis extending in a horizontal direction and an axis extending in a vertical direction. The first loudspeaker unit is placed so as to be directed horizontally forward. The second loudspeaker unit is placed so as to be directed vertically upward to make an approximately 90° angle with the first loudspeaker unit.