Z.M. Yuldashev - Dr. Sc. (Eng.), Professor, Head of the Department of Biotechnical Systems, Saint-Petersburg Electrotechnical University «LETI» E-mail: yuld@mail.ru M.N. Solovev - Post-graduate Student, Department of Biotechnical Systems, Saint-Petersburg Electrotechnical University «LETI»; Engineer, Firm «Diamant» Ltd (St.-Petersburg) E-mail: zenimike@gmail.com