Laser & Optoelectronics Progress, Volume. 60, Issue 23, 2306004(2023)
Voice and Footstep Signal Monitoring System Based on Phase Sensitive Optical Time Domain Reflectometer
Figures & Tables(14)
Fig. 1. Structure diagram of voice and footstep signal detection system based on φ-OTDR
Fig. 6. Time domain and frequency domain diagrams of human voice reproduction signal
Table 1. Optical device performance index
View tableTable 1. Optical device performance index
Device performance index Index parameter Remark Wavelength of laser /nm 1550 — Laser output linewidth /kHz 3 — Output optical power of the laser /dBm 13 — AOM center frequency /MHz 200 — Optical pulse width /ns 30 Adjustable BPD bandwidth /MHz 0‒200 — Sampling rate of the acquisition card /GHz 1 Adjustable
Table 2. MOS value evaluation standard
View tableTable 2. MOS value evaluation standard
Audio level MOS value Evaluation criterion Excellent 4.0‒5.0 Good，good hearing，little delay，good communication Good 3.5‒4.0 Slightly poor，clear hearing，little delay，communication is not smooth，there is noise Middle 3.0‒3.5 It’s okay，it’s hard to hear，there’s a delay，you can communicate Bad 1.5‒3.0 It’s hard to hear，there’s a lot of delay，communication needs to be repeated a lot Inferior 0.0‒1.5 Very poor，unintelligible，large delay，poor communication
Table 3. MOS value evaluation of human voice signal
View tableTable 3. MOS value evaluation of human voice signal
Number of personnel MOS value Number of personnel MOS value Number of personnel MOS value Mean value 1 4.0 6 3.0 11 3.7 3.72 2 4.0 7 3.5 12 3.6 3 4.1 8 4.0 13 3.6 4 4.0 9 3.5 14 3.3 5 3.7 10 3.8 15 4.0
Table 4. MOS value evaluation of music signal
View tableTable 4. MOS value evaluation of music signal
Number of personnel MOS value Number of personnel MOS value Number of personnel MOS value Mean value 1 3.5 6 3.0 11 3.4 3.44 2 3.5 7 3.7 12 3.5 3 3.5 8 3.0 13 3.6 4 3.5 9 4.0 14 2.8 5 3.6 10 3.5 15 3.5
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Wenda Sun, Jing Zheng, Yuan Sun. Voice and Footstep Signal Monitoring System Based on Phase Sensitive Optical Time Domain Reflectometer[J]. Laser & Optoelectronics Progress, 2023, 60(23): 2306004
Paper Information
Category: Fiber Optics and Optical Communications
Received: Nov. 3, 2022
Accepted: Dec. 29, 2022
Published Online: Dec. 4, 2023
The Author Email: Zheng Jing (zhengjing8628@163.com)
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