Multi-Wavelength Speckle Signal Processing for Sound Measurement
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Solution Overview
Problem
Existing technologies struggle to measure sounds from multiple objects using speckle patterns, as they can only process signals from a single object effectively.
Innovation Solution
A signal processing device that radiates coherent light with multiple wavelengths, captures speckle images, and processes them to separate and analyze signals from each wavelength, allowing for the measurement of sounds from multiple objects by using a filter to disperse wavelengths and extract regions of interest.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single wavelength of coherent light is used to capture speckle images, then the measurement precision for a single object is improved, but the ability to measure sounds from multiple objects deteriorates
Solution Approach 1:
The patent segments the measurement task by wavelength, capturing speckle images at multiple discrete wavelengths and processing them separately. This allows the system to maintain high measurement precision for each wavelength while collectively measuring sounds from multiple objects, as each wavelength can be associated with a different object or spatial region.
Solution Approach 2:
The patent adds the wavelength dimension to the measurement space. By measuring speckle images across multiple wavelengths (adding a spectral dimension), the system can distinguish between multiple objects that would otherwise be indistinguishable in a single-wavelength measurement, thereby enabling multi-object sound measurement while maintaining precision.
2Adaptability or versatility
If multiple wavelengths are used to measure multiple objects, then the adaptability to measure multiple objects is improved, but the device complexity increases
Solution Approach 1:
The patent employs a universal measurement framework where the same speckle imaging system and processing algorithm can measure multiple objects by simply varying the wavelength parameter. This multi-functional approach allows a single device configuration to handle multiple measurement tasks without requiring separate specialized systems for each object, thereby managing complexity while maintaining versatility.
Solution Approach 2:
The patent changes the wavelength parameter of the coherent light source to enable multi-object measurement. By systematically varying this single parameter (wavelength) rather than adding multiple independent measurement systems, the patent achieves multi-object capability with controlled complexity increase, as the underlying measurement and processing architecture remains unchanged.
3Adaptability or versatility
If speckle images at multiple wavelengths are captured and processed separately, then the sound measurement capability for multiple objects is improved, but the processing time increases
Solution Approach 1:
The patent performs preliminary separation of speckle images by wavelength before detailed analysis. By organizing and pre-processing the multi-wavelength data structure in advance, the system prepares the data for efficient parallel or sequential processing, reducing the overall processing time required to extract sound information from multiple objects compared to handling mixed-wavelength data without pre-separation.
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 the measurement of sounds from multiple objects by analyzing variations in speckle images across different wavelengths, effectively overcoming the limitations of previous technologies.
Implementation Method 1
a speckle image representing an interference state of reflected light caused by the light radiated from the light source unit
Implementation Method 2
beams of coherent light having a plurality of wavelengths
Implementation Method 3
a phenomenon of producing such a pattern is called, for example, a speckle phenomenon
Implementation Method 4
The imaging unit can include a filter that disperses the wavelengths
Data Source
AI summary
A signal processing device is provided for acquisition of predetermined information. The signal processing device includes a light source unit configured to radiate beams of coherent light having a plurality of wavelengths; an imaging unit configured to capture a speckle image representing an interference state of reflected light caused by the light radiated from the light source unit to an object; and a processing unit configured to process, for each of the wavelengths, the speckle image captured by the imaging unit. The processing unit acquires the predetermined information by analyzing a variation amount of the speckle image acquired for each of the wavelengths. The light source unit radiates beams of light having different wavelengths to a plurality of respective objects. The present technology can be applied to a sensor.