Laser voice acquisition method for moving target based on variational mode decomposition

Xinxue Dai; Songtao Fan; Yan Zhou

doi:10.1117/12.3007884

18 December 2023 Laser voice acquisition method for moving target based on variational mode decomposition

Xinxue Dai, Songtao Fan, Yan Zhou

Proceedings Volume 12963, AOPC 2023: Optical Sensing, Imaging, and Display Technology and Applications; and Biomedical Optics; 129631J (2023) https://doi.org/10.1117/12.3007884
Event: Applied Optics and Photonics China 2023 (AOPC2023), 2023, Beijing, China

Abstract

In terms of public security, voice is one of the most crucial types of intelligence, and research on the remote collection of voice intelligence has substantial research ramifications and applications in fields like counterterrorism and narcotics control. Most optical remote sensing-based laser voice acquisition technologies in use today illuminate static target objects placed in a long-distance sound field using invisible infrared lasers, and then use phase demodulation to obtain vibration information of the target along the beam direction. The benefits of this technology are strong concealment, good directionality, and a long working distance. In practical, it can be difficult to find the appropriate statically positioned acoustic-excited targets in the sound field. In this work, the proposed method utilizes variational mode decomposition method to separate the characteristic modes of the multimodal vibration signals of moving targets in the sound field. Each mode is weighted, reconstructed, and merged to create the acoustically excited signal of the moving target based on the variations in amplitude and frequency bands between the moving object's macroscopic displacement signal and the vibration signal. Last but not least, the objective speech quality evaluation method of PESQ was used to assess the laser speech signal produced by the dynamic target laser speech acquisition method based on variational mode decomposition. According to the research, the standing person laser speech's PESQ score increased from 1.704 to 2.804, indicating a noticeable improvement in speech quality.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Xinxue Dai, Songtao Fan, and Yan Zhou "Laser voice acquisition method for moving target based on variational mode decomposition", Proc. SPIE 12963, AOPC 2023: Optical Sensing, Imaging, and Display Technology and Applications; and Biomedical Optics, 129631J (18 December 2023); https://doi.org/10.1117/12.3007884

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KEYWORDS

Modal decomposition

Target acquisition

Vibration

Laser applications

Demodulation

Laser frequency

Interference (communication)

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