Patent ID: 7197079

Claim:
A transmitting device for transmitting a digital information signal via a transmission medium, comprising: input means for receiving the digital information signal, means for encoding the digital information signal and generating an output signal, wherein the encoding means are adapted to generate portions of the output signal in the form of encoded portions of the digital information signal under the influence of a first type of control signal, and are adapted to generate portions of the output signal in the form of portions of the digital information signal under the influence of a second type of control signal, means for generating a first identification signal of a first type which indicates that the output signal possibly includes a portion of the digital information signal which has been encoded in the encoding means, and a first identification signal of a second type which indicates that the output signal does not include any portions of the digital information signal which have been encoded by the encoding means, means for generating, for a portion of the digital information signal, a second identification signal of a first type in dependence on the first type of control signal and the first identification signal of the first type, and a second identification signal of a second type in dependence on the second type of control signal and the first identification signal of the first type, combining means for combining the output signal of the encoding means, the first identification signal and, if the first identification signal is of the first type, the second identification signal so as to obtain a composite signal to be applied to the transmission medium.