Terminal Device Vibration Assembly Resonance Suppression
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Solution Overview
Problem
The increased length of sound guide channels in terminal devices due to antenna layout changes causes resonance peaks near the microphone's resonance frequency, leading to recording distortion and poor recording quality.
Innovation Solution
A terminal device design incorporating a parallel resonant structure formed by a sound guide channel and a second cavity, with a vibration assembly and surface coating to suppress the resonance peak, ensuring balanced frequency response and reduced distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the sound guide channel length is increased due to antenna layout changes, then the antenna clearance is improved, but the resonance peak near the microphone's resonance frequency increases causing recording distortion
Solution Approach 1:
The patent introduces a vibration assembly that utilizes the resonance phenomenon to its advantage. The vibration assembly includes a vibration plate that vibrates at the resonance frequency to generate a counteracting sound wave that suppresses the harmful resonance peak. This converts the harmful resonance effect into a beneficial cancellation mechanism, reducing distortion while maintaining the extended sound guide channel length required for antenna clearance.
Solution Approach 2:
The patent employs mechanical vibration through the vibration assembly and vibration plate to actively counteract the resonance peak. The vibration plate is designed to vibrate at specific frequencies that generate anti-phase sound waves, which interfere destructively with the harmful resonance frequencies in the sound guide channel, thereby suppressing the resonance peak and improving recording quality.
2Object-generated harmful factors
If a dust-proof net with large acoustic resistance is used to reduce the resonance peak, then the resonance suppression is improved, but the risk of hole blocking increases
Solution Approach 1:
Instead of using passive acoustic resistance methods that block holes, the patent converts the resonance problem into a controllable vibration phenomenon. The vibration assembly actively generates counteracting vibrations at controlled amplitudes and frequencies, suppressing resonance peaks without physically blocking the sound collection holes, thereby maintaining reliability while achieving resonance suppression.
3Volume of moving object
If the microphone position is moved further inward to accommodate antenna clearance, then the antenna layout is improved, but the sound guide channel length increases causing resonance issues
Solution Approach 1:
The patent addresses the increased sound guide channel length by introducing active vibration control. The vibration assembly and vibration plate generate controlled vibrations that counteract the resonance effects inherent in the longer channel, allowing the microphone to be positioned inward for antenna clearance while maintaining acceptable recording quality through active resonance suppression.
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 solution effectively suppresses resonance peaks, enhancing microphone recording quality and reducing noise and distortion, resulting in improved sound collection and amplitude limiting prevention.
Implementation Method 1
a length of the sound guide channel determines a resonance frequency of the microphone, and an increased length of the sound guide channel causes the microphone to form a relatively sharp resonance peak near the resonance frequency
Implementation Method 2
a vibration assembly, wherein the vibration assembly generates vibration to suppress a resonance peak
Data Source
Figure 1~2
Figure 3
AI summary
The present disclosure disclosures a terminal device, including a housing (100), a microphone (200), a sound guide support (400), a circuit board (500), and a vibration assembly. The housing (100) is provided with a sound collecting hole (111), the sound guide support (400) and the circuit board (500) are disposed in the housing (100), the sound guide support (400) and the circuit board (500) form a first cavity (A), the vibration assembly is disposed between the sound guide support (400) and the circuit board (500) and separates the first cavity (A) into a sound guide channel (Al) and a second cavity (A2), and the microphone (200) and the sound collecting hole (111) are respectively disposed at both ends of the sound guide channel (Al).