The method for passing signals through a medium under monitoring consists in generating a reference signal, transmitting this reference signal in a forward direction through the medium under monitoring by means of at least one transmitting electrical circuit, receiving the signal passing in the forward direction through the medium under monitoring by means of at least one receiving electrical circuit, transmitting the generated reference signal in the reverse direction through the medium under monitoring by means of the at least one receiving electrical circuit, receiving the signal passing in the reverse direction through the medium under monitoring by means of the at least one transmitting electrical circuit and thus ensuring the passage of signals through the medium under monitoring. The method for passing signals through a medium under monitoring ensures the production of signals passing through the medium under monitoring which have a high degree of identity.