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Multiple video server system for transmitting data to a constant bit rate network through a variable bit rate network

  • US 6,023,725 A
  • Filed: 04/29/1996
  • Issued: 02/08/2000
  • Est. Priority Date: 09/08/1995
  • Status: Expired due to Fees
First Claim
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1. A multiple video server apparatus for providing video services from a video transmission center to a plurality of user terminals, comprising:

  • a first network of a variable bit rate provided in said video transmission center;

    a second network of a constant bit rate connecting said first network and the plurality of user terminals; and

    a server unit, provided in said video transmission center, transmitting data to said first network at a transmission interval T where T=DL/n where "n" is the constant bit rate of said second network and "DL" is a transmission data amount to be transmitted to said first network, wherein said server unit includes;

    a data storage unit storing transmission data on a stream unit basis;

    a buffer memory temporarily storing the data transmitted from said data storage unit to said second network;

    a network interface transmitting the data in said buffer memory to said first network;

    a timer unit generating a transmission timing signal at every transmission interval T by frequency dividing a transmission clock of said first network, anda processor module that when a transmitting request of the data stream is received, reads the transmission data from said data storage unit and stores the transmission data into said buffer memory, and each time a transmission timing signal is obtained from said timer unit, reads the transmission data on a data amount DL unit basis from said buffer memory to said network interface and transmits the transmission data to said first network.

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