equation of existence active suppression of speech signal additive manufacturing technology automatic control system autonomous underwater vehicle design phase design problems destructive changes of phonemic structure digital phonogram elastic link improving the design of MTS with EL information modeling information protection marine technical system marine technology mathematical model that describes the dynamics of an elastic link mathematical modeling prevention of leakage of speech information propulsion and steering complex protection of speech information remotely operated vehicles rotary nozzle scrambler-type speech generator scrambler-type speech-like generator spatial motion speech intelligibility index system approach systems approach towed underwater system towed underwater vehicle uncertainty conditions unmanned towed underwater system wavelet transformation