A.Yu. Glazova - Post-graduate Student, Professor assistant, Department of Biotechnical Systems, Saint-Petersburg Electrotechnical University «LETI» n.a. V.I. Ulyanov (Lenin). E-mail: anna-glazova777@yandex.ru
A.A. Makarenkova - Ph.D. (Phys.-Math.), Senior Research Scientist, Department of Hydrodynamic Acoustic, Institute of Hydromechanics, The National Academy of Sciences of Ukraine (Kiev, Ukraine). E-mail: maa@mail.ru

In the article it is shown that electronic lung auscultation can be effectively used for the remote examination of patients with various bronchopulmonary diseases. The following technology of the remote auscultation is suggested by authors. Vital activity sounds are registered with electronic stethophonendoscope, then signal is sent to the analog input of mobile device (smartphone, tablet PC), where signal is digitized and written down to a wav file. The other necessary information is typed by the patient or medical assistant from the keyboard and saved in database of mobile device. The database file and the lung sound file are passed by secure communication channels to the server, from which data access can be obtained by a diagnostician. After special research, taking in consideration remote diagnostic working conditions, medical and technical requirements for the electronic stethophonendoscope were formulated. As an electro-acoustic sensor to be effectively used in telemedicine systems contact piezoelectric microphone is recommended. On the basis of contact microphone portable electronic stethophonendoscope - ЭФОН-08 - was constructed, its structure and operational principle are considered in the article. It-s shown that the most efficient and convenient way for the lung sound processing is phonospirographic analysis with following polychromatic visualization and detection of specific diagnostic features by an expert. The technique is analyzed in more details, as an example phonospirographic image of the sound signal, registered with - EPHON-08 - from COPD stage II patient during an exacerbation period, is given.