Vehicle Speaker Tube Layout for Stronger Low-Frequency Echo
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Solution Overview
Problem
Conventional on-vehicle speaker devices fail to enhance acoustic characteristics of low sound ranges due to inadequate sound reflection within vehicle spaces.
Innovation Solution
A speaker system for vehicles that includes a speaker unit emitting sound into a box-shaped space, a tubular member connected to an accommodating unit, and an end opening towards the gap between the vehicle door and body, allowing low sound range components to resonate and echo, improving sound pressure through reflection off vehicle surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sound is emitted from the back side of the speaker through a cylindrical acoustic tube in the instrument panel, then the low sound range can resonate in the tube, but the acoustic characteristics of the low sound range are not sufficiently improved because the sound does not echo easily in the vehicle space
Solution Approach 1:
The invention transitions from a two-dimensional planar speaker mounting to a three-dimensional spatial sound emission system. The tubular member extends from the instrument panel through the vehicle interior to the lower surface, creating a vertical dimension for sound propagation. This spatial extension allows low frequency sounds to resonate throughout the vehicle cabin volume, improving acoustic characteristics by utilizing the third dimension rather than confining sound to the instrument panel plane.
Solution Approach 2:
The tubular member acts as an intermediary structure that transports sound from the speaker in the instrument panel to the lower surface of the vehicle. This intermediate conduit enables sound waves to reach areas of the vehicle interior that would otherwise be inaccessible, facilitating sound echo and resonance throughout the cabin space while maintaining the speaker's original mounting position.
2Device complexity
If the speaker is installed in the instrument panel with front side at upper surface, then the structure is simple, but the low sound range acoustic characteristics cannot be sufficiently improved
Solution Approach 1:
The invention divides the sound emission function into two separate components: the speaker unit remaining in the instrument panel and the tubular member extending to the lower surface. This segmentation allows the speaker to maintain its simple instrument panel installation while the tubular member independently provides the sound propagation path needed for improved low frequency acoustics, separating the mounting simplicity function from the acoustic performance function.
Solution Approach 2:
The tubular member is nested within the vehicle's existing structural space, utilizing the vertical volume between the instrument panel and the lower surface. This nesting approach allows the addition of the tubular sound transmission element without requiring external modifications to the vehicle body, accommodating the enhanced acoustic system within the existing vehicle architecture.
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
Enhances acoustic characteristics of low sound ranges by promoting sound reflection and resonance within the vehicle space, improving sound pressure and reducing wind noise, while allowing middle and high sound ranges to reach passengers effectively.
Implementation Method 1
a component of the low sound range corresponding to a length of the tubular member among sounds generated at the back side of the speaker unit resonates in the tubular member and is emitted from the other end
Implementation Method 2
the component of the low sound range emitted from the other end is reflected on two surfaces of the lower surface of the door which forms the gap and a surface of the part of the vehicle body
Data Source
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AI summary
The present invention provides a speaker system for a mobile object which is capable of improving the acoustic characteristics of a low sound range. The speaker system for the mobile object (1) includes a speaker unit (2) which emits sound from a front side toward a box-shaped space (A1) formed by a mobile object (C) having a vehicle body (B) and a door (D) installed on the vehicle body, an accommodating unit (3) which accommodates a back side of the speaker unit, a tubular member (4) has one end connected to an internal space of the accommodating unit, and the other end (4B) of the tubular member is opening toward a gap (K) between a lower end part (Da) of the door and a part of the vehicle body (SS) which confronts the lower end part of the door.