Speaker System Compact Directivity via Multi-Tweeter Array
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Solution Overview
Problem
Existing speaker systems struggle to achieve constant directivity over a wider frequency range while maintaining a compact construction, as traditional constant directivity horns are bulky and complex, and box-type speaker systems with tweeters fail to control directivity stably across a wide frequency range.
Innovation Solution
A speaker system comprising an enclosure with a baffle front plate and a shorter rear plate, featuring a woofer unit for low frequencies and multiple tweeter units arranged in a line, with the tweeter units' vibration plates near the front plate, forming a smooth wave surface for constant directivity. The speaker cluster system extends this by arranging multiple speaker systems in a line with curved front plates and using coupling means to adjust angles and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a constant directivity horn is used to obtain constant directivity in a wide frequency range, then directivity control is improved, but the system dimension and complexity increase significantly
Solution Approach 1:
The speaker system is divided into multiple independent speaker units (first speaker unit for low frequencies, second speaker units for high frequencies) that are arranged in a specific configuration. Each unit operates independently in its frequency range, collectively achieving constant directivity without requiring a complex horn structure.
Solution Approach 2:
Multiple speaker units are combined in a coordinated arrangement where the first speaker unit and second speaker units work together to produce constant directivity across a wide frequency range. The merging of multiple simple units achieves the function of a complex horn while reducing overall system complexity.
2Reliability
If a constant directivity horn is used to obtain constant directivity in a wide frequency range, then directivity control is improved, but the system dimension increases making installation difficult
Solution Approach 1:
The speaker units are arranged in a specific spatial configuration involving multiple dimensions (front plate portion, rear plate portion with specific length relationships). This multi-dimensional arrangement allows compact packaging while maintaining the acoustic properties needed for constant directivity, avoiding the need for a large horn structure.
3Ease of operation
If a box-type speaker system with a small horn tweeter is used for easy installation, then ease of installation is improved, but directivity control stability deteriorates in wide frequency range
Solution Approach 1:
Different parts of the speaker system are optimized for their specific functions: the first speaker unit handles low frequencies, while multiple second speaker units handle high frequencies. Each component is positioned with specific local characteristics (vibration plates near front plate, arranged in first direction) to achieve overall constant directivity performance.
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 allows for constant directivity across a wider frequency range and adjustable directivity angles, achieving a more compact and efficient speaker system that outperforms traditional designs in maintaining directivity control.
Implementation Method 1
since the second speaker units for high-frequency bandwidth are arranged in the first direction, the wave surface (isophase surface) along the front plate is formed
Implementation Method 2
vibration plates of the plurality of second speaker units are located in the vicinity of the front plate portion in the forward and backward direction
Data Source
AI summary
A speaker system includes an enclosure, a first speaker unit for low frequency and a plurality of second speaker units for high frequency. The enclosure includes a front plate portion which is a baffle plate and a rear plate portion. A length of the rear plate portion in a first direction perpendicular to a forward and backward direction is shorter than a length of the front plate portion in the first direction. The first speaker unit and the second speaker units are mounted to the front plate portion. The plurality of second speaker units are arranged in the first direction. Vibration plates of the plurality of second speaker units are located in the vicinity of the front plate portions in the forward and backward direction.