Mobile Speaker Resonance Space for Bass Tone Reproduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional mobile terminal speaker devices face limitations in sound pressure output and articulation level due to limited space, leading to increased acoustic distortion and inadequate reproduction of low bass tones, which fails to deliver accurate sound reproduction for multimedia and DMB services.
Innovation Solution
A speaker device with a resonance space formed between the speaker frame and a frame cover, utilizing a yoke, magnetic member, voice coil, and vibration plate to generate sound, and a duct hole to prevent sound wave interference, enhancing midrange and bass tone reproduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If speaker units are mounted in the limited space of the mobile terminal, then the device can be compact and portable, but the sound pressure output and articulation level are reduced, and acoustic distortion increases
Solution Approach 1:
The patent utilizes the third dimension by creating a resonance space between the speaker frame and frame cover, extending the acoustic chamber depth without increasing the lateral footprint of the device. This allows sufficient volume for bass reproduction while maintaining compact mobile terminal dimensions.
Solution Approach 2:
The patent employs a resonance structure that utilizes acoustic vibration and resonance phenomena to amplify bass frequencies. The resonance space is designed to resonate at specific frequencies, enhancing low-frequency output without requiring larger speaker units or increased device volume.
2Adaptability or versatility
If additional speaker units are added for stereo sound output, then sound quality should improve, but the limited space reduces sound pressure output and increases acoustic distortion
Solution Approach 1:
The patent combines multiple acoustic functions into a single integrated speaker unit. The resonance structure integrates bass enhancement, midrange optimization, and stereo capability into one compact assembly, eliminating the need for separate speaker units while maintaining sound quality through acoustic resonance and wave interference control.
Solution Approach 2:
The resonance structure utilizes acoustic resonance to amplify specific frequency ranges, particularly bass tones, allowing a single speaker unit to deliver enhanced sound pressure and stereo-quality output without requiring multiple physical speakers.
3Volume of moving object
If the speaker units are mounted in limited space, then device portability is maintained, but bass tone reproduction becomes inadequate
Solution Approach 1:
The patent extends the acoustic chamber in the depth dimension by creating a resonance space between the speaker frame and frame cover. This provides sufficient volume for bass resonance while keeping the device's lateral dimensions compact and portable.
Solution Approach 2:
The resonance structure is specifically designed to enhance bass frequency reproduction through acoustic resonance. The cavity dimensions and configuration are optimized to resonate at bass frequencies, providing reliable low-frequency output despite the compact overall device size.
4Device complexity
If sound waves are allowed to propagate freely in the limited space, then device simplicity is maintained, but sound wave interference occurs and degrades sound quality
Solution Approach 1:
The resonance structure controls sound wave propagation by creating a defined acoustic cavity that manages wave reflection and interference patterns. This structured approach to acoustic wave management improves sound quality by reducing harmful interference while maintaining relative structural simplicity.
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 speaker device effectively reinforces midrange and bass tones, allowing for accurate sound reproduction in compact mobile terminals, enhancing the user experience during multimedia and DMB services by reducing acoustic distortion and improving sound pressure.
Implementation Method 1
a yoke, magnetic member, voice coil, and vibration plate to generate sound
Implementation Method 2
A speaker device with a resonance space formed between the speaker frame and a frame cover, utilizing a yoke, magnetic member, voice coil, and vibration plate to generate sound, and a duct hole to prevent sound wave interference, enhancing midrange and bass tone reproduction
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A speaker device for use in a mobile terminal includes a speaker frame with a speaker unit mounted therein, and a frame cover provided at the rear side of the speaker frame to form a resonance space between the speaker frame and the frame cover. Sound that is output in a forward direction of the speaker unit is emitted to a front space of the speaker frame, and sound that is output to the rear of the speaker unit is emitted through the resonance space. The speaker device provides the resonance space at the rear side of the speaker frame to reinforce the output of midrange and bass tones, thereby reproducing the original sound as accurately as possible. The speaker device enables a user to enjoy vivid sound when reproducing a multimedia file or viewing a digital multimedia broadcast (DMB) program on a small-sized device, such as a mobile terminal.