Air-Pulse Generating Device for Compact High Sound Pressure
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Solution Overview
Problem
Conventional speakers face challenges in producing high sound pressure levels across the entire audio frequency band while maintaining a compact size, as they require large radiating surfaces and enclosures to achieve high fidelity sound.
Innovation Solution
An air-pulse generating device utilizing a film structure driven by modulation and demodulation signals to produce amplitude-modulated ultrasonic air pressure variations, creating air pulses that are temporally interleaved and synchronized with an ultrasonic carrier frequency, allowing for efficient sound production with reduced size and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If conventional speakers use large radiating surfaces and large back enclosures, then high sound pressure level and high fidelity sound are achieved, but device size becomes large
Solution Approach 1:
The back enclosure is divided into multiple sealed cavities (first sealed cavity and second sealed cavity) separated by a partition. Each cavity independently houses a speaker driver, allowing the system to achieve high sound pressure levels through multiple drivers working in parallel while keeping each individual cavity compact. This segmentation enables the overall system to be more space-efficient than a single large enclosure would be.
Solution Approach 2:
The partition between the two sealed cavities is configured at an oblique angle rather than perpendicular to the speaker drivers. This angular arrangement optimizes the spatial distribution of acoustic energy and allows for more efficient use of the enclosure volume, effectively packing the system more densely in three-dimensional space while maintaining acoustic performance.
2Stress or pressure
If conventional speakers use large radiating surfaces, then high sound pressure level is achieved, but device area increases
Solution Approach 1:
The radiating surface is divided into multiple smaller radiating surfaces, each associated with an individual speaker driver in separate sealed cavities. Multiple drivers operating in parallel from these segmented surfaces collectively produce high sound pressure levels without requiring a single large radiating surface, thus reducing the overall footprint of the device.
3Reliability
If conventional speakers are designed for high fidelity sound across entire audio frequency band, then sound quality is improved, but device complexity increases
Solution Approach 1:
The audio frequency band coverage is achieved by segmenting the system into multiple speaker drivers, each capable of operating independently within the full audio range. This segmentation allows each driver to be optimized for high fidelity performance without requiring complex crossover networks or multiple specialized drivers for different frequency ranges, thereby maintaining relatively simple system architecture while achieving broad frequency coverage.
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 sound pressure levels with low power consumption by generating air pulses that effectively cover the entire audio frequency range, overcoming the size limitations of conventional speakers.
Implementation Method 1
the film structure is driven by a modulation-driving signal, so as to form an amplitude-modulated ultrasonic air pressure variation with an ultrasonic carrier frequency
Implementation Method 2
form an amplitude-modulated ultrasonic air pressure variation with an ultrasonic carrier frequency
Implementation Method 3
the air-pulse generating device produces a plurality of air pulses according to the amplitude-modulated ultrasonic air pressure variation
Data Source
AI summary
An air-pulse generating device includes a film structure. The film structure is driven by a modulation-driving signal, so as to form an amplitude-modulated ultrasonic air pressure variation with an ultrasonic carrier frequency. The film structure is driven by a first demodulation-driving signal and a second demodulation-driving signal, so as to form an opening at a rate synchronous with the ultrasonic carrier frequency. The air-pulse generating device produces a plurality of air pulses according to the amplitude-modulated ultrasonic air pressure variation.