V.I. Mirgorodskij - Dr.Sc. (Phys.-Math.), Professor, Leading Research Scientist, Fryazino Branch of Federal State Budgetary Institution of Science Institute of Radioengineering and Electronics Named After V.A. Kotelnikov of RAS. E-mail: vim288@ms.ire.rssi.ru A.V. Gerus - Ph.D. (Phys.-Math.), Senior Research Scientist, Fryazino Branch of Federal State Budgetary Institution of Science Institute of Radioengineering and Electronics Named After V.A. Kotelnikov of RAS. E-mail: agierus@fryazino.net V.V. Gerasimov - Ph.D. (Phys.-Math.), Senior Research Scientist, Fryazino Branch of Federal State Budgetary Institution of Science Institute of Radioengineering and Electronics Named After V.A. Kotelnikov of RAS. E-mail: vvg_288@ms.ire.rssi.ru S.V. Peshin - Ph.D. (Phys.-Math.), Senior Research Scientist, Fryazino Branch of Federal State Budgetary Institution of Science Institute of Radioengineering and Electronics Named After V.A. Kotelnikov of RAS. E-mail: svp288@ire216.msk.su

The analysis of noise parameters of acoustic receivers with the plate type piezoelectric transducers designed for registration of signals from the media with acoustic impedances the close to water impedance in frequency band from 100 Hz to 100 kHz was carried out. On the basis of the carried-out analysis it was shown that the manufactured receivers of acoustic emission possess the close to extremely achievable parameters of sensitivity. Experimentally the noise factor at a frequency of 100 kHz is measured; its value is 4,4 dB. It allowed to estimate value of a noise factor in low frequency region: at a frequency of 1 kHz the noise factor is -9,1 dB that approximately on 15 dB exceeds value of a noise factor of comercial acoustic receivers. By means of the developed receivers, the un-known earlier signals generated in the human head have been found and referred to as acoustoencephalographic signals.

 

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