Использование ультразвуковых колебаний для защиты речевой информации

Abstract

The given work is devoted to the modem problems of protecting audio information with the help of nonlinear effects appearing when ultrasound wave spread. Nonlinearity changes a waveform because the wavespeed can depend on the stress level, so that the high-stress parts at the peaks of a wave move at a different speed than those at low stress (some effects make the speed higher and some lower).