Acoustic Device Flexible Deformation Part Bass Response
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Solution Overview
Problem
Traditional acoustic systems face challenges in reproducing bass due to volume limitations, with methods like sound-absorbing materials and passive radiators either damaging the speaker or only enhancing sensitivity near the resonance frequency, failing to improve low-frequency sensitivity across all bands.
Innovation Solution
An acoustic device with a sound generating unit, a first sealed cavity, and a flexible deformation part that adjusts volume, combined with a protective cover plate and air-permeable micropores, to reduce resonance frequency and enhance low-frequency sensitivity by isolating and balancing sound waves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a passive radiator is provided on the housing to enhance bass reproduction, then the low-frequency sensitivity near the resonance frequency point is improved, but the sound waves from the passive radiator and sound generating unit offset each other in the frequency band below the resonance point, resulting in negative effect on sensitivity
Solution Approach 1:
The patent divides the acoustic system into separate functional modules: a sound generating unit for active sound production and a passive radiator for resonance enhancement. By segmenting these functions and isolating their sound waves through spatial separation and directional control, the system achieves both resonance enhancement and prevents destructive interference between the two sound sources.
Solution Approach 2:
The patent applies local quality by enhancing sensitivity specifically at the resonance frequency point through the passive radiator, while maintaining different acoustic characteristics in other frequency bands. The sound generating unit provides broad-frequency sound production, while the passive radiator provides localized enhancement at the resonant frequency, creating different acoustic qualities in different frequency regions.
2Volume of stationary object
If sound-absorbing material is added to the housing to increase volume and reduce resonance frequency, then the low-frequency response is improved, but good sealing and packaging of the sound-absorbing material is required to prevent damage to the speaker unit
Solution Approach 1:
The patent extracts the sound-absorbing function from the housing cavity and relocates it to a dedicated chamber separate from the speaker unit. This extraction allows the sound-absorbing material to be contained in a controlled environment without directly contacting or damaging the speaker components, while still achieving the desired acoustic effect of increasing effective volume and reducing resonance frequency.
Solution Approach 2:
The patent introduces an intermediary chamber that separates the sound-absorbing material from the speaker unit. This intermediary structure serves as a mediator that allows the sound-absorbing material to perform its function of increasing acoustic volume without creating direct sealing requirements between the housing and speaker unit, thus simplifying the overall device structure.
3Volume of stationary object
If the cavity volume is increased to reduce resonance frequency, then the bass reproduction is improved, but the acoustic system has volume limitations that make it difficult to achieve satisfactory bass
Solution Approach 1:
The patent implements a nested structure where the sound-absorbing chamber is contained within or integrated into the housing cavity, and the passive radiator is incorporated into the housing structure. This nesting allows multiple functional elements to occupy the same spatial envelope, effectively increasing the acoustic volume for bass enhancement without proportionally increasing the external dimensions of the acoustic system.
Solution Approach 2:
The patent employs dynamic elements including a flexible diaphragm in the sound generating unit and a passive radiator that resonates at specific frequencies. These dynamic components allow the system to adaptively adjust acoustic properties and enhance bass response without requiring a statically large cavity volume, as the dynamic elements create acoustic pressure variations that simulate larger volume effects.
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 reduces resonance frequency and improves low-frequency sensitivity, preventing offset effects from anti-phase radiated sound waves and maintaining pressure balance, while minimizing material costs and space usage.
Implementation Method 1
a flexible deformation part provided at the mounting hole, a second sealed cavity provided at outside the first sealed cavity, the flexible deformation part located between the first sealed cavity and the second sealed cavity
Implementation Method 2
a plurality of air permeable micropores provided on the protective cover plate, each of the air permeable micropores having an area less than or equal to 0.2 mm2
Implementation Method 3
a sound generating unit provided with a vibrating diaphragm, a sound wave at a front side of the vibrating diaphragm radiating to outside through a sound outlet
Implementation Method 4
the second sealed cavity enclosing a sound wave, which is generated by the flexible deformation part during deformation, in the second sealed cavity
Data Source
AI summary
Disclosed is an acoustic device, comprising a sound generating unit, a sound wave at a front side of the vibrating diaphragm radiates to outside through the sound outlet, a first sealed cavity is formed at a rear side of the vibrating diaphragm, a cavity wall of the first sealed cavity is provided with a mounting hole, a flexible deformation part is provided at the mounting hole, the second sealed cavity encloses a sound wave, in the second sealed cavity, a protective cover plate located at outside of the flexible deformation part is further provided on the mounting hole, and an escape space used for avoiding vibration of the flexible deformation part is formed between the protective cover plate and the flexible deformation part; air permeable micropores are provided on the protective cover plate, the air permeable micropores have an area less than or equal to 0.2 mm2.