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EP0625858A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Video server memory management method

Assignee: Alcatel Lucent SAS
•
Filing: 1993-05-19
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Granted: —
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Expires: 2013-05-19
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Abstract

Abstract The present invention relates to a video server memory management for a video server transmitting video signals (VS) to user stations in response to control signals issued by these stations. This method includes the steps of providing a memory constituted by a plurality of random access memories (HD1/../HD4) and subdividing each of said video signals in a plurality of distinct blocks (BL1/../BLQ) each typically corresponding to less than a second of the video signal. It is further proposed to include in this method the step of storing any two blocks (BL1/../BLQ) which normally are to be consecutively retrieved from the memory in distinct random access memories (HD1/../HD4). In this way the full interactive video on demand service, giving the user stations control over the way in which the blocks are retrieved from the memory, is improved as is the rate at which a predetermined sequence of blocks is retrieved from the memory.

Inventors

  • 👤 Bart Frans Voeten
  • 👤 Christophe Daniel Ghislain Vermeulen
  • 👤 Frank Octaaf Van Der Putten
  • 👤 Frank Cyriel Michel Defoort

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-01 22:07
CPC Classifications
H; H04; H04N; H04N21/00; H04N21/20; H04N21/21; G; G11; G11C; G11C7/00; H04N21/23; H04N7/00; H04N7/16; H04N7/173; H04N7/17309; H04N7/17336; H04N7/17345

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 109 words
Video server memory management method including the steps of providing a memory constituted by a plurality of random access memories (HD1/../HD4) each having a single output (O1/../O4) for retrieving data stored therein, subdividing each of said video signals in a plurality of distinct blocks (BL1/../BLQ) corresponding to successive parts of said video signal, storing at least two of said blocks in each of said random access memories, and, retrieving said blocks from said random access memories in a predetermined sequence, characterized in that said method further includes the step of storing any two consecutive blocks (BL1/../BLQ) of said predetermined sequence in distinct ones of said random access memories (HD1/../HD4).
Claim 2
Dependent Claim 102 words
Video server memory management method according to claim 1, characterized in that said plurality of random access memories (HD1/../HDM) is constituted by an even number of disk shaped memories (HD11, HD22) each having a plurality of cylinders and is partitioned in equally large first and second subsets of memories, and that said method further includes the step of storing consecutive odd numbered blocks (BL1, BL3, ..) and consecutive even numbered blocks (BL2, BL4, ..) of said sequence in successive cylinders of said first (HD11) and of said second subset (HD22) respectively and in first and second directions respectively which are mutually opposite.
Claim 3
Dependent Claim 64 words
Video server memory management method according to claim 1, characterized in that said plurality of memories comprises a sequence of M consecutively numbered random access memories and said plurality of blocks comprises a sequence of Q consecutively numbered blocks and that each of said blocks with sequence number Y is stored in the random access memory with sequence number equal to Y mod M.
Claim 4
Dependent Claim 36 words
Video server memory management method according to claim 1, characterized in that said single outputs (O1/../O4) of said plurality of random access memories (HD1/../HD4) are controlled from a same memory controller (SCSIC) via a bus (SCSI).
Claim 5
Dependent Claim 38 words
Video server memory management method according claim 3, characterized in that said method further includes the step of providing within said video signal (VS) a spread mode indicator indicating the number M of said plurality of memories (HD1/../HD4).

References Cited (Backward Citations)

DE3633165A1 Cited
WO1990007184A1 Cited

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