Air Pulse Speaker Chamber Design for Full-Range Sound
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Solution Overview
Problem
Conventional speaker drivers face challenges in producing high-fidelity sound across the full range of human audible frequencies due to the need for multiple components, which increases size and cost, and suffer from distortion in compact designs due to insufficient enclosure volume.
Innovation Solution
A sound producing device utilizing air pulse generating elements with a membrane, a first air chamber, and through-holes, where the membrane is actuated to change chamber pressure to generate air pulses with a non-zero offset, propagating sound pressure levels through the through-holes, utilizing a pulse cycle with distinct pulse-generating and pulse-isolating time segments to maintain pressure difference and enhance acoustic wave propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple speaker drivers (tweeters, mid-range drivers, woofers) are used to cover full audible frequency range, then frequency coverage is improved, but device size and complexity increase
Solution Approach 1:
The patent applies universality by designing a single speaker driver capable of producing full-range audible frequencies (20 Hz to 20 kHz) that traditionally required multiple specialized drivers. The diaphragm and acoustic chamber system performs multiple functions: generating sound across all frequency ranges, managing acoustic pressure, and eliminating the need for separate tweeters, mid-range drivers, and woofers.
Solution Approach 2:
The patent merges the functions of multiple speaker drivers into a single integrated unit. By combining the acoustic chamber, diaphragm, and pressure management system into one device, it consolidates what traditionally required separate components (tweeters, mid-range drivers, woofers) into a unified speaker driver structure.
2Volume of moving object
If speaker enclosure volume is reduced for compact devices, then device size is improved, but sound quality and fidelity deteriorate due to distortion
Solution Approach 1:
The patent applies parameter changes by fundamentally altering the acoustic pressure dynamics within the enclosure. By maintaining positive chamber pressure and controlling pressure fluctuations, the system achieves high-fidelity sound reproduction in compact volumes. The pressure management mechanism changes the operational parameters to prevent distortion even when enclosure volume is reduced.
Solution Approach 2:
The patent employs periodic action through the oscillating diaphragm that creates controlled pressure variations within the acoustic chamber. This periodic movement of the diaphragm generates sound waves while the pressure management system ensures these variations remain within optimal ranges, preventing distortion and maintaining sound fidelity in compact designs.
3Stress or pressure
If conventional speaker driver membrane area is increased to improve low-frequency output, then low-frequency sound pressure is improved, but high-frequency response deteriorates due to excessive air movement requirements
Solution Approach 1:
The patent introduces an intermediary acoustic chamber with pressure management between the diaphragm and the external environment. This intermediary system mediates the relationship between diaphragm movement and sound output, allowing the diaphragm to operate at optimal displacement ranges while the pressure chamber buffers and regulates the air movement, enabling both low-frequency pressure and high-frequency response.
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 achieves high-fidelity sound production with reduced size and complexity, maintaining sound pressure levels while minimizing distortion, by using air pulses at ultrasonic rates to overcome the limitations of conventional speaker designs.
Implementation Method 1
the membrane is actuated to change the chamber pressure of the first air chamber to generate a plurality of air pulses, the air pulses are propagated through the at least one opening
Implementation Method 2
the air pulses produce a non-zero offset in terms of sound pressure level, and the non-zero offset is a deviation from a pressure value of an ambient pressure outside the sound producing device
Data Source
AI summary
A sound producing device includes at least one air pulse generating element. Each of the at least one air pulse generating element includes a membrane, a first air chamber and at least one opening, wherein a chamber pressure exists in the first air chamber. The membrane is actuated to change the chamber pressure of the first air chamber to generate a plurality of air pulses, the air pulses are propagated through the at least one opening, the air pulses produce a non-zero offset in terms of sound pressure level, and the non-zero offset is a deviation from a pressure value of an ambient pressure outside the sound producing device. Each pulse cycle has a pulse-generating time segment and a pulse-isolating time segment, the driving signal during the pulse-generating time segment is different from the driving signal during the pulse-isolating time segment.