Oblique Bass Driver Layout for Compact Low-Distortion Speakers
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Solution Overview
Problem
Existing smart speakers face challenges in achieving high-quality low-frequency bass output without increasing enclosure and driver size, leading to increased cost, distortion, and complexity.
Innovation Solution
The use of an oblique-mounted bass driver with a larger piston area and an elastomeric reflector-damper plate in a compact enclosure design, which disperses frequencies and reduces distortion, while maintaining a small footprint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If the enclosure and driver size are increased to achieve desired low frequency bass response, then bass output quality is improved, but the physical size of the speaker increases
Solution Approach 1:
The bass driver is mounted at an oblique angle (e.g., 45 degrees) relative to the enclosure walls rather than parallel to them. This angular orientation allows the driver to utilize three-dimensional space more efficiently, achieving extended bass response without increasing the speaker's external dimensions. The oblique mounting creates varying distances between the driver and enclosure walls at different angular positions, enabling bass frequencies to radiate in multiple directions simultaneously.
Solution Approach 2:
The patent embeds multiple functional elements within the compact enclosure: the oblique-mounted bass driver, elastomeric reflector-damper plates, and electronic subsystems are all integrated into a single compact structure. The reflector-damper plates are positioned within the internal space to manipulate acoustic waves without requiring additional external volume.
2Difficulty of detecting and measuring
If driver excursion capability is increased to move more air volume for bass output, then bass output is improved, but distortion increases
Solution Approach 1:
Elastomeric reflector-damper plates are positioned within the enclosure to act as intermediaries between the bass driver and the enclosure walls. These plates reflect and dampen acoustic waves, preventing harmful standing waves and resonances that cause distortion. The reflector-damper plates manage acoustic pressure distribution, allowing the driver to operate with reduced excursion while maintaining bass output quality.
Solution Approach 2:
The patent replaces the conventional approach of increasing mechanical driver excursion with an acoustic field-based solution. By using oblique mounting to create multi-directional bass radiation and reflector-damper plates to manipulate acoustic waves, the system achieves extended bass response through acoustic field control rather than mechanical driver movement, thereby reducing distortion.
3Difficulty of detecting and measuring
If a larger audio amplifier is used to push the driver to maximum excursion, then bass output capability is improved, but cost and device complexity increase
Solution Approach 1:
The oblique mounting orientation enables the bass driver to radiate acoustic energy in multiple spatial dimensions simultaneously. This multi-directional bass radiation allows a smaller amplifier to achieve the same perceived bass output capability as a larger amplifier would provide in a conventional single-direction system, reducing both amplifier size and cost.
4Difficulty of detecting and measuring
If driver excursion is increased to achieve bass output without larger enclosure, then bass displacement is improved, but distortion and cost increase
Solution Approach 1:
The elastomeric reflector-damper plates serve as acoustic intermediaries that manage the pressure waves generated by the bass driver. By reflecting and damping these waves, the plates prevent distortion-causing resonances and standing waves, enabling the driver to achieve maximum bass displacement without the distortion that would normally result from high excursion operation.
Solution Approach 2:
The patent replaces mechanical driver excursion with acoustic field manipulation. The oblique mounting creates multi-directional bass radiation patterns, and the reflector-damper plates shape and control the acoustic waves, achieving extended bass output through acoustic field effects rather than mechanical driver movement, thereby avoiding distortion.
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 design enhances bass output and reduces acoustic frequency distortion, maintaining audio performance without enlarging the speaker's physical size, and avoids costly signal processing techniques.
Implementation Method 1
A bass driver is mounted in the internal space for generating a bass output
Implementation Method 2
The reflector-damper plate is configured to radially disperse low to midrange audio frequencies of the bass output
Implementation Method 3
An elastomeric reflector-damper plate is spaced apart from the bass driver in the internal space
Data Source
AI summary
A speaker device includes a bass driver mounted in the internal space of an enclosure for generating a bass output. The bass driver has a central axis along which a piston area of the bass driver actuates oriented at an oblique angle relative to the bottom end of the enclosure to increase bass driver size and acoustic output and to reduce acoustic frequency distortion by providing a varying distance between the bass driver and the top and bottom ends of the enclosure. An elastomeric reflector-damper plate is spaced apart from the bass driver in the internal space in the enclosure. The reflector-damper plate radially disperses low to midrange audio frequencies of the bass output of the bass driver around the enclosure to further reduce acoustic frequency distortion. Electronic subsystems in the internal space coupled to the bass driver receive and process input audio signals to be rendered by the bass driver.