Segmented Acoustic Display Layout Using Phase Maps
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Solution Overview
Problem
Existing acoustic display devices face challenges in designing segmented displays that can accurately generate complex sound fields without aliasing effects, particularly at high frequencies, due to the difficulty in fabricating uniformly distributed elements smaller than the wavelength, and existing sparse representation techniques fail to dynamically switch between different images efficiently.
Innovation Solution
A method is developed to design segmented display devices by generating phase maps for acoustic elements, grouping them into non-overlapping segments, and using phase retrieval algorithms to optimize the arrangement, allowing for fewer actuators and efficient dynamic switching between outputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uniformly distributed elements smaller than wavelength are used to avoid aliasing effects, then sound field quality is improved, but manufacturing complexity and cost increase significantly
Solution Approach 1:
The patent divides the acoustic display device into multiple segments, where each segment contains a group of sound modulating elements that are controlled together. This segmentation allows the use of larger-than-wavelength elements within each segment while avoiding aliasing effects at segment boundaries, thereby improving sound field quality without requiring uniformly distributed sub-wavelength elements across the entire device.
Solution Approach 2:
The patent applies different phase values to different segments based on their local requirements. Each segment is assigned a specific phase value that is optimized for its local region, allowing the system to achieve high-quality sound fields without requiring uniform sub-wavelength element distribution throughout the entire device.
2Measurement precision
If more sound modulating elements are used to achieve higher resolution, then output quality is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent groups sound modulating elements into segments that can be controlled independently. By optimizing the segmentation and assigning appropriate phase values to each segment, the system achieves high-resolution output with fewer total elements compared to traditional approaches that require uniform fine-grained control of all elements.
Solution Approach 2:
Each segment can be configured to perform multiple functions by changing phase values dynamically. This multi-functionality allows fewer segments to achieve the same resolution and versatility as a larger number of individually controlled elements, reducing overall device complexity.
3Adaptability or versatility
If heuristically designed segments are used for acoustic displays, then segmentation can be achieved, but the process becomes computationally intensive and may not produce viable results
Solution Approach 1:
The patent pre-calculates optimal phase values for each segment based on the desired sound field distribution. This preliminary action allows the segmentation to be performed efficiently without requiring computationally intensive heuristic optimization during operation, significantly reducing computation time while maintaining segmentation capability.
Data Source
AI summary
A method (100) of designing a segmented display device (1) having a plurality of elements (5) arranged in an array (3), each element (5) providing an individual output such that the plurality of elements (5) form a collective output of the device (1), wherein each element (5) is actuatable to control the individual output, the method (100) comprising: providing (102) a set (7) of images (9) representing a set of collective outputs from the device (1); generating (104) phase maps (13) of the images (9), the phase maps (13) having a phase value for each element (5) of the plurality of elements (5); and based on the phase maps (13), generating a plurality of non-overlapping groups of elements, wherein the elements (5) in each group are arranged to be actuated together as a segment (15) to cause display of any one of the set of collective output.