Abstract: A transmission system in which the transmitter (10) transmits a multiplex signal (12) to the receiver (14). The multiplex signal includes a periodically repeated plurality of modules (42) which each comprise at least one object (32,36,40). The receiver comprises extracting means (16) for extracting objects from the multiplex signal. The extraction is performed based on module related information which is included in the multiplex signal.

Abstract: A storage file system is provided for data stored on a storage medium, and particularly for storage of data on optical disc storage medium. Each successive or alternate file of data included in the storage medium is represented by a respective allocation extent list with each allocation extent identifying locations of data segments for each file. Data in some data segments or portions of data segments may be shared by two or more files with each file having a respective allocation extent list entry referencing that segment and each such allocation extent maintaining byte-accurate pointers to the start and end of the data relevant to each file within the data segment. An allocation space table containing respective entries for each reference to a data segment or portion of a data segment, and optionally a free-space table identifying those data segments or portions of data segments available for rewriting, may be provided to allow for rapid reclamation of free within the storage medium.

Abstract: The transmission system comprises a transmitter (10) and a receiver (14). The transmitter (10) can transmit a number of multiplex signals (12) to the receiver (14). The receiver (14) comprises storage means (20) for storing data sections included in the multiplex signals (12) in dependence on information present in the multiplex signals (12). The information for the complete set of multiplex signals (12) is contained in a single information section in at least one of the multiplex signals (12).

Abstract: A file management system is provided which enables the peaceful coexistence of two or more file systems from different applications (12,16) on the same medium (10). Available free space can be assigned to each of the file systems. Static partitioning of the medium in fixed sized parts is not necessary, as partition sizes can be dynamically changed.