Acoustic Diode Sound Generation Device
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Solution Overview
Problem
Existing generating devices for producing audible sound require high-energy ultrasound signals, are sensitive to changes in air properties, and have complex constructions, making them inefficient and costly.
Innovation Solution
A generating device with a medium stream source producing alternating flows in high frequencies, a medium stream diode that adjusts flow resistance, and a sink that suppresses high-frequency components, allowing for the generation of audible sound with reduced energy input and independence from surrounding air properties, using integrated circuit technology and acoustic diodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high-energy ultrasound signals are projected into the air to generate audible sound, then audible sound with sufficiently high energy content is obtained, but the energy balance becomes unfavorable due to the ultrasound energy level being above the audible sound energy level by several orders of magnitude
Solution Approach 1:
The patent introduces air flows as an intermediary medium between the ultrasound source and the audible sound output. The ultrasound generates alternating air flows that are then rectified by acoustic diodes to produce unidirectional audible sound waves, thereby mediating the energy transfer and reducing the direct energy requirement from ultrasound to audible sound
Solution Approach 2:
The patent replaces the direct acoustic field interaction with a mechanical flow-based system. Instead of relying on nonlinear air properties to convert ultrasound to audible sound, the system uses physical air flow generation and rectification through acoustic diodes, substituting a mechanical approach for the direct acoustic conversion
2Power
If ultrasound signals are projected into air to generate audible sound, then audible sound is produced, but the generation depends on air properties and changes in these properties, leading to inconsistent sound quality
Solution Approach 1:
The patent replaces the reliance on nonlinear acoustic properties of air with a mechanical flow rectification system using acoustic diodes. The air flows are physically directed and rectified through the diode structure, making the sound generation process independent of air property variations and ensuring consistent sound quality
3Power
If a generating device uses multiple ultrasound sources to generate audible sound, then sound generation is achieved, but a comparatively complicated constructional expenditure is necessary
Solution Approach 1:
The patent extracts and utilizes the air flow generation capability from ultrasound sources, then separates the sound generation function from the ultrasound generation function by introducing acoustic diodes and sinks. This allows using simpler ultrasound sources combined with passive acoustic components rather than complex multi-source arrangements
Solution Approach 2:
The patent introduces air flows as an intermediary that simplifies the system architecture. Instead of directly converting ultrasound to audible sound through complex interactions, the air flow mediator enables a simpler cascade: ultrasound generates air flows, acoustic diodes rectify flows, acoustic sinks suppress high frequencies, and audible sound is produced
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 efficiently generates sound with reduced high-frequency components outside and minimal dependence on air properties, enabling simple and cost-effective production of audible sound across a wide frequency range.
Implementation Method 1
at least one medium stream source for generating at least one medium stream in alternating mutually opposed flow directions, which mutually opposed flow directions alternate with a frequency lying within a second frequency range
Implementation Method 2
at least one medium stream diode which is provided, constructed and arranged for cooperating with a stream of a medium generated by at least one medium stream source and which, in dependence on the flow direction of the stream of a medium cooperating therewith, works counter to said stream of the medium with flow resistances of different values
Implementation Method 3
at least one medium stream sink which is provided, constructed, and arranged for cooperating with the total medium stream generated by means of the at least one medium stream diode and which suppresses the stream components within the second frequency range contained in the total medium stream
Data Source
AI summary
A generating device (1) for generating a useful stream of a medium (2) comprises at least a medium stream source (14) for generating a high-frequency medium stream (15) and at least a medium stream diode (36, 37) for cooperating with the generated medium stream (15), and at least one medium stream sink (40, 41) for cooperating with the medium stream influenced by the medium stream diodes (36, 37), wherein the at least one medium stream sink (40, 41) suppresses high-frequency stream components in the medium stream such that a useful medium stream (2) in a low-frequency range is obtained.