Koninklijke Philips Corporation N.v.

Other

Pieter Bas Ijdens

Declan Patrick Kelly

Ronald Marcel Tol

Antonius Adriaan Maria Staring

Wilhelmus Jacobus Van Gestel

Octavius John Morris

Robert Jochemsen

Timothy J Everett

Method to enable a local system time clock counter (STC) of a receiving recording device to lock to program clock reference (PCR) information comprised in a received real time sequence of information signal packets, such as MPEG2 Transport Stream packets. The method comprising determining the number of cycles between arrival of the first information signal packet and the arrival of the information signal packet comprising the first Program Clock Reference (PCR) information. This information is stored as an attribute of the stored sequence.

Method of setting a system time clock at the start of an MPEG sequence

In a method for providing copy-protection services on a storage medium (for instance a solid state memory module), the data are arranged in sectors to which a field (S4T) is associated, where said field contains a random value Rwhich is changed randomly when writing data to said sector. By encrypting the data stored on the medium using a key which depends critically on said random numbers, bit-by-bit copies (apart from said random numbers, which can not be deterministically changed by an application) to a second storage medium or recopies from some intermediate storage medium, can not be decrypted because the values of said random numbers will have changed, thus preventing unauthorized duplication and replay attacks.

Method and system for providing copy-protection on a storage medium and storage medium for use in such a system

Various methods are disclosed for producing an edited MPEG audio/video stream from first and second streams recorded in a transport-stream format normally intended for broadcast purposes. According to one implementation, a bridge sequence is generated which recodes data from both of the original streams, in the region of the edit point. Padding packets are inserted in the elementary streams to adjust a continuity counter values so as to allow continuous decoding across the join between bridge sequence and second sequence proper. In another implementation, seamless playback is not required, the bridge sequence is omitted, and various process are implemented 'on-the-fly' to generate an edited stream compliant with MPEG-2 specification. To this end, exit and entry points are constrained to certain types of coded pictures, and offset between time-bases is adjusted to avoid buffer overflow.

Methods and apparatus for editing digital video recordings, and recordings made by such methods

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.

File systems supported data sharing

A file management system is provided which enables the peaceful coexistence of two or more file systems from different applications ( ) on the same medium ( ). 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.

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Eindhoven, Netherlands

Pieter Bas Ijdens