Acoustic Levitation Control with Scattering-Aware Trap Modeling
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Solution Overview
Problem
Existing acoustic levitation techniques struggle to accurately compute sound scattering off physical objects within the levitation volume in real-time, leading to distorted sound fields and limited interaction with physical objects.
Innovation Solution
A two-step modeling approach using a static matrix and direct and scattering transmission matrices to determine control instructions for transducers, allowing real-time control of acoustic traps and object location, even in the presence of scattering objects, by pre-computing the static matrix and calculating direct and scattering contributions in parallel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If traditional voice coil actuators are used in loudspeakers, then electromagnetic driving force is generated to vibrate the diaphragm, but magnetic leakage occurs affecting nearby electronic components and human health
Solution Approach 1:
The patent extracts and removes the harmful magnetic field from the loudspeaker system by eliminating the traditional voice coil actuator that generates magnetic leakage, while preserving the essential electromagnetic driving function through alternative means that do not produce harmful radiation
Solution Approach 2:
The patent converts the harmful electromagnetic radiation into a beneficial non-radiating electromagnetic driving force by using a capacitorless electromagnetic actuator that generates the necessary magnetic field for diaphragm vibration without the harmful leakage associated with traditional voice coils
2Productivity
If voice coil actuators are used to drive the diaphragm, then sound is generated, but high-frequency noise is produced affecting human health
Solution Approach 1:
The patent extracts and eliminates the high-frequency noise component generated by traditional voice coil actuators while preserving the useful sound generation function through an alternative actuation mechanism that does not produce harmful electromagnetic radiation
Solution Approach 2:
The patent converts the harmful high-frequency electromagnetic noise into beneficial acoustic output by using a capacitorless electromagnetic actuator that drives the diaphragm to produce sound waves without generating harmful electromagnetic radiation in the process
3Power
If voice coil actuators are used, then electromagnetic driving force is achieved, but the structure becomes complex and expensive
Solution Approach 1:
The patent extracts and removes the complex and expensive voice coil actuator structure while preserving the essential electromagnetic driving function through a simplified capacitorless electromagnetic actuator that eliminates the need for traditional voice coil components
Solution Approach 2:
The patent replaces the expensive and complex voice coil actuator with a simpler, more cost-effective capacitorless electromagnetic actuator structure that achieves the same driving function with fewer components and lower manufacturing costs
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
Enables high-speed, real-time manipulation of objects within acoustic volumes with arbitrary scattering surfaces, supporting applications like interactive mid-air displays and 3D printing by achieving computational efficiency and accuracy in controlling object positions.
Implementation Method 1
a capacitorless electromagnetic actuator is used in the loudspeaker, which has no magnetic leakage and generates no high-frequency noise
Implementation Method 2
Electromagnetic radiation from voice coil actuators in loudspeakers and other electromagnetic acoustic transducers can have a harmful effect on electronic components in the vicinity and on human health
Data Source
Figure 1a~1b
Figure 1c~1d
Figure 2
AI summary
The present techniques provide a method, apparatus and system for high-speed acoustic levitation, for example high-speed acoustic holography or other applications. A novel technique is presented that allows high-speed multi-point levitation even in the presence of arbitrary sound-scattering surfaces and demonstrates a process that works in the presence of any physical object. Embodiments provide a simplified approach for determining locations of traps in a working volume which may also be termed an acoustic volume or acoustic chamber. Moreover, embodiments provide an approach for determining the location of traps by determining a contribution of a scattering surface in the working volume and a contribution from a target object in the working volume.