V.I. Mirgorodsky1, V.V. Gerasimov2, A.V. Gerus3, V.V. Dementienko4, E.M. Korablev5, A.P. Kundin6

1–3, 5, 6 Fryazino Branch, Kotelnikov Institute of Radio Engineering and Electronics RAS (Fryazino, Russia)

4 Kotelnikov Institute of Radio Engineering and Electronics RAS (Moscow, Russia)

1 vim510488@gmail.com, 2 vad_geras@mail.ru

There is a problem of determining the moments of falling asleep of operators whose work requires their continuous attention. Such requirements are often found in areas such as transport, energy, etc. In practice, such control is usually carried out by registering signals of pulse and breathing signals, which requires the placement of appropriate sensors on the operator's body, which in itself is not easy, and the presence of sensors makes it difficult for operators to move. Based on this, reducing the number of required sensors and creating sensor designs that are less burdensome for operators is, in our opinion, an important topical problem.

The aim of the work was to study the possibility of determining the state of falling asleep of the subject by the parameters of the acoustic signal taken from the temple of the subject. The use of such a lead when placing the sensor, for example, in a headgear, can be made not too burdensome for the subject. Pulse signals and signals reflecting the intensity of acoustic noise associated with breathing are separated from this signal by filtering. According to the changes in the parameters of these signals, the onset of the state of falling asleep is judged.

In the course of the work, 49 experiments were performed to record acoustic emission from the temporal regions of 13 subjects at rest lying with their eyes closed. The experiments consisted of two stages, lasting 15 minutes each. At the first stage, the subjects were motivated for mental work, consisting in pronouncing the multiplication table to themselves, and at the second stage of the experiments, the subjects were motivated for relaxation, often leading to falling asleep. The signals obtained in this way were averaged to provide an acceptable signal-to-noise ratio, and then they were subjected to frequency filtering in the ranges of 0.5 Hz - 30 Hz for heart rate detection and 300 Hz - 3 kHz for respiration signals detection. The received signals were subjected to analysis, as a result of which the ability of the subjects was determined.

As a result of the work, it was shown that it is possible to simultaneously record both the acoustic signals of the heart rate and the signals of respiratory sounds with sufficient quality for analysis from the temporal leads. The proposed method presents an advantage over the commonly used methods of separate recording of these signals, methodological simplicity, and the fact that the reception of acoustic emission from the temporal regions (or one temporal region) can be made with less burdening the subjects. Such control should, in our opinion, be of interest to professions associated with the need to maintain long-term attention.

Mirgorodsky V.I., Gerasimov V.V., Gerus A.V., Dementienko V.V., Korablev E.M., Kundin A.P. The use of acoustic signals received from the human head to detect falling asleep. Biomedicine Radioengineering. 2024. V. 27. № 1. Р. 36-43. DOI: https://doi.org/ 10.18127/j15604136-202401-05 (In Russian)

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