Dashboard Vibration Playback Device for Low-Frequency Sound
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Solution Overview
Problem
Small speakers placed on vehicle dashboards struggle to produce full low-frequency sound and create a sound field with presence when playing back audio, particularly when sound is directed towards a listener.
Innovation Solution
A playback device with a housing, an attachment portion for a dashboard, a speaker for mid-to-high frequency sound, and a vibration unit that vibrates to produce low-frequency sound, where the vibration unit's abutment surface contacts the dashboard, enhancing low-frequency sound reproduction by utilizing the dashboard as a resonating enclosure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a small speaker is placed on a vehicle dashboard, then the device size is reduced and ease of installation is improved, but low-frequency sound reproduction deteriorates
Solution Approach 1:
The patent combines a small speaker with a vibration unit that directly contacts the dashboard surface. The vibration unit generates low-frequency vibrations that are transmitted through the dashboard, merging the functions of a small speaker with the dashboard structure to achieve both compact size and adequate low-frequency reproduction
Solution Approach 2:
The dashboard serves as an intermediary between the vibration unit and the air. The vibration unit generates low-frequency vibrations that are transmitted through the dashboard surface, which then radiates sound into the air. This intermediary approach allows the small speaker to achieve low-frequency reproduction without requiring a large enclosure
2Speed
If sound is played back toward a listener using a small speaker, then directional sound output is achieved, but sound field presence deteriorates
Solution Approach 1:
The patent adds a new dimension to sound reproduction by utilizing the dashboard surface as a vibration radiating area. Instead of relying solely on the small speaker to project sound in one direction, the vibration unit causes the entire dashboard surface to vibrate, creating omnidirectional low-frequency sound radiation that enhances sound field presence while maintaining directional capability for mid-to-high frequencies
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
The device effectively plays back audio from low to mid-to-high registers with improved sound quality and presence by combining speaker output with dashboard vibration, providing a more expansive sound experience.
Implementation Method 1
a vibration portion that vibrates in accordance with a second audio signal having a second band that is lower than the first band
Implementation Method 2
the vibration portion having an abutment surface that abuts at a second position on the attachment surface
Data Source
AI summary
A playback device including: a housing: an attachment portion to a first position on an attachment surface; a speaker that plays back sound in a predetermined direction in accordance with a first audio signal having a first band; and a vibration portion that vibrates in accordance with a second audio signal having a second band that is lower than the first band, the vibration portion having an abutment surface that abuts at a second position on the attachment surface. The attachment member, the speaker, and the vibration portion are attached to the housing.