Abstract
A study of the optimal parameters of a distributed fiber microphone circuit based on a laboratory setup of a phase-sensitive optical reflectometer (φ-OTDR), which reproduces the work of φ-OTDR at one point, has been carried out. Various schemes for constructing a microphone based on φ-OTDR and various sampling rates of the analog-to-digital converter are investigated. The optimal configuration of the φ-OTDR circuit is substantiated, which made it possible to ensure high quality of human speech recognition during voice recording by the proposed method with a sampling frequency of 40 kHz. In a standard phrase based on Harvard sentences containing 80 words, 71 words were recognized, i.e., 88.75% of their total number.
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Funding
The work of T.V. Gritsenko and A.A. Zhirnov in terms of studying the noise of the installation and coordination of work (Section 2) was supported by the Russian Science Foundation (grant no. 22-79-00225); the work of Yu.A. Konstantinov and A.T. Turov in terms of the idea of the study and discussion of the results (Sections 2, 3) was carried out within the framework of the State Assignment no. AAAA-A19-119042590085-2.
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International conference “Optical Reflectometry, Metrology, & Sensing 2023,ˮ Russia, Perm, May 24–26, 2023.
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Orlova, M.V., Gritsenko, T.V., Zhirnov, A.A. et al. Investigation of the Optimal Parameters of the Distributed Fiber Microphone Circuit Based on φ-OTDR for Speech Recognition. Instrum Exp Tech 66, 832–836 (2023). https://doi.org/10.1134/S0020441223050202
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DOI: https://doi.org/10.1134/S0020441223050202