Mingqiao Liu, Shenglong Zhang, Yuanxin Zhong, Zheng Liu, Yanli Gong, Chunming Gao. Extraction of Sound from Secondary Speckle Patterns in Real Time[J]. Laser & Optoelectronics Progress, 2025, 62(3): 0312005
- Laser & Optoelectronics Progress
- Vol. 62, Issue 3, 0312005 (2025)
Fig. 1. Laser speckle image
Fig. 2. Principle of laser speckle vibration measurement
Fig. 3. Schematic of real-time audio detection system based on detector and Fresnel lens
Fig. 4. Laser speckle vibration measurement system
Fig. 5. MFCC speech quality evaluation process
Fig. 6. PESQ speech quality evaluation process
Fig. 7. Indoor experimental scenes
Fig. 8. Experimental results. (a) Original time-domain signal; (b) spectrogram of original time-domain signal; (c) reconstructed time-domain signal; (d) spectrogram of reconstructed time-domain signal
Fig. 9. Signal time-domain diagrams at different distances. (a) 20 m; (b) 40 m; (c) 60 m; (d) 80 m
Fig. 10. Outdoor experimental scenes
Fig. 11. Experimental result. (a) Original time-domain signal; (b) spectrogram of original time-domain signal; (c) reconstructed time-domain signal; (d) spectrogram of reconstructed time-domain signal
Fig. 12. Schematic of laser irradiation on back of a person's neck
Fig. 13. Experimental result. (a) Original time-domain signal; (b) spectrogram of original time-domain signal; (c) reconstructed time-domain signal; (d) spectrogram of reconstructed time-domain signal
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Table 1. Frequency error
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Table 2. Evaluation results of reconstructed speech based on four criteria
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Table 3. Evaluation results of speech reconstruction at different distances
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Table 4. Evaluation results of reconstructed speech based on four criteria
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Table 5. Evaluation results of reconstructed speech based on four criteria
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