Abstract: This invention relates to digital transmission techniques whereby information produced in asynchronous form, for instance by variable-length coding and/or by conditional coding, is intended for transmission through a synchronous digital transmission path. More particularly, the invention concerns a receiving device comprising a picture buffer memory having a content that can be different from that of a picture buffer memory included in a transmitting device of the system, a circuit for detecting picture line and field synchronizations, a circuit for transcoding video information prior to its writing in the receiving device buffer memory and a circuit for monitoring writing and reading addresses in the buffer memory in terms of the detected synchronizations. A partial decoding of the video information is performed prior to entry in the receiving device buffer memory, and a synchronization of this memory is independent of the content in the transmitting device buffer memory.