Television – Special applications – Manufacturing
Patent
1994-05-19
1996-08-27
Metjahic, Safet
Television
Special applications
Manufacturing
348 10, 348 13, 455 41, 455 51, H04N 710, H04N 714, H04N 7173
Patent
active
055505775
ABSTRACT:
A video on demand network (VODN), transmits video signals (VS) to user stations (US11, . . . , US2N) pursuant to the receipt of control signals (CS) issued by these user stations. In order to optimize the retrieval costs, this video on demand network maintains a large video library in a central video server (CS) and stores locally popular video signals in a plurality of local distributed video servers (DS1/2) from which the latter video signals are transmitted to the user stations. The video signals provided by the local distributed servers are updated from the central server based upon the changing popularity of the video signals. The present invention proposes in particular to store the video signals in the local distributed servers in random access read/write memories (HDA), e.g., electronic RAMs, magnetic or optical disks, and/or the like, from which the video signals can flexibly be supplied on-line to the user stations and to store the video signals in the central server in sequential access memories, e.g. Digital Audio Tapes (DAT) and CD-ROMs (CDR), providing cheap mass storage.
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Defoort Frank C. M.
Van der Putten Frank O.
Verbiest Willem J. A.
Vermeulen Christophe D. G.
Voeten Bart F.
ALCATEL N.V.
Metjahic Safet
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