| 摘要 |
The invention relates to a transmitting device, comprising a transmitting antenna, the transmitting antenna (1) comprising at least one transducer (10) and one signal-generating unit (120) for generating an acoustic communication signal to be transmitted towards a receiving device including concealed information, characterised in that the signal-generating unit is configured so as to previously record an original acoustic signal, said signal-generating unit being capable of generating said communication signal to be transmitted by adding to an initial signal x(t), derived from the original signal, an auxiliary signal previously multiplied by at least one symbol, said symbol having a phase and/or an amplitude carrying the concealed information and said auxiliary signal being calculated from the initial signal by means of a chosen transformation operator which is dependent on a steganographic key. |
