Scalable interactive multimedia server system for providing on demand data

• US 5,646,676 A
• Filed: 05/30/1995
• Issued: 07/08/1997
• Est. Priority Date: 05/30/1995
• Status: Expired due to Term

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Dewkett, Thomas J., Boyd, William Todd
• Primary Examiner(s): Peng, John K.
• Assistant Examiner(s): GRANT, CHRISTOPHER C
• Application Number:
  US08/452,920
• Time in Patent Office: 770 Days
• Field of Search: 348/7, 348/12, 348/13, 348/6, 455/4.2, 455/5.1, 455/6.1
• US Class Current: 725/92
• CPC Class Codes: H04N 21/21 Server components or server architectures
• CPC Class Codes: H04N 21/23 Processing of content or additional data; Elementary server operations; Server middleware
• CPC Class Codes: H04N 7/148 Interfacing a video terminal to a particular transmission medium, e.g. ISDN
• CPC Class Codes: H04N 7/17336 Handling of requests in head-ends

Abstract

Connects a host computer system (such as a mainframe or host server system) to a large multimedia (MM) distribution network having wide scalability without being limited by bandwidth constraints in the host system or in any multimedia controller for controlling "on demand" viewing of movies at a large number of set-top-boxes (STBs) with TV sets. Connected to the host system is a network distribution arrangement comprised of a plurality of multimedia (MM) adapters, each MM adapter containing a plurality of MM controllers, each MM controller being connected to a multiplicity of MM pairs, each MM pair being connected to the network for controlling a direct distribution of movies to a large number of STBs. Each MM pair includes a disk adapter and a network adapter connected by a common MM pair bus for transmitting disk data blocks directly to the STBs. The disk adapter controls and receives data from one or more disk devices. The network adapter sends the disk data to the network. In each MM pair, a pair bus connects the network adapter to transmit data from the disk adapter to the network. Data files (movies) are stored on the disks, and any file can be selected by an STB for transmission to the STB. Data blocks are read directly from the disk to the pair bus and then directly through the network to the requesting STB. Any STB may issue interactive commands to control a data file while it is being received.

Claims

1. A hierarchical multimedia (MM) distribution system for supporting "on demand" control of graphical data files being received by viewing-control devices connected to a network, comprising:

a host computer system for monitoring the MM distribution system,

the MM distribution system comprised of a plurality of MM adapters connected to the host computer system,

each MM adapter containing one or more MM controllers, each MM controller containing a controller bus connected to an MM processor,

one or more MM pairs connected to the controller bus,

each MM pair including a disk adapter and a network adapter, the disk adapter connected to one or more disk drives for receiving data blocks read from selected disk drives, graphical data files being stored on the disks, and data blocks in a requested data file being read directly from each selected disk to the disk adapter,

a pair bus in each MM pair for directly receiving the data blocks received by the disk adapter and for directly transmitting the data blocks to the network adapter,

the network adapter in each MM pair directly distributing the data blocks from the pair bus to the network, each data block being addressed to any viewing-control device requesting a data file containing the data block, and

means in each viewing-control device for issuing interactive commands through the network to the network adapter to control characteristics of data reception of the requested data file being transmitted to each viewing-control device.

2. A hierarchical multimedia (MM) distribution system for supporting "on demand" control of graphical data files being received by viewing-control devices connected to a network as defined in claim 1, the command means at a viewing-control device comprising

means for generating a control block having a field for containing a command being requested by the viewing-control device, and

means for sending the control block through the network to the connected network adapter and transferring the control block to an associated MM processor for the MM processor to receive the command.

3. A hierarchical multimedia (MM) distribution system for supporting "on demand" control of graphical data files being received by viewing-control devices connected to a network as defined in claim 1, further comprising

the viewing-control devices being set-top-boxes (STBs) connected to viewing devices respectively comprising television (TV) sets, and

commands being keyed into the STBs by viewers of the TV sets.

4. A hierarchical multimedia (MM) distribution system for supporting "on demand" control of graphical data files being received by viewing-control devices connected to a network as defined in claim 1, further comprising

at least some of the graphical data files containing both audio and visual information.

5. A hierarchical multimedia (MM) distribution system for supporting "on demand" control of graphical data files being received by viewing-control devices connected to a network as defined in claim 2, further comprising

movies comprising at least some of the graphical data files.

6. A hierarchical multimedia (MM) distribution system for supporting "on demand" control of graphical data files being received by viewing-control devices connected to a network as defined in claim 1, further comprising

I/O channels in the host computer system connecting a MM adapter bus to the host computer memory,

commands from any viewing-control device being sent to the network adapter and forwarded to the connected MM processor for processing.

7. A hierarchical multimedia (MM) distribution system for supporting "on demand" control of graphical data files being received by viewing-control devices connected to a network as defined in claim 2, further comprising

a start command being interpreted by the MM processor and forwarded to the host computer system for determining authorization by the viewing-control device to receive a data file requested by the start command, and the host computer system signalling the MM processor that the requested data file is not to be sent to the requesting viewing-control device.

8. A hierarchical multimedia (MM) distribution system for supporting "on demand" control of graphical data files being received by viewing-control devices connected to a network as defined in claim 2, further comprising

a start command received by the MM processor and transferred to the host computer system for determining authorization by the viewing-control device to receive a data file requested by the start command, and the host computer system signalling the MM processor that the requested data file is to be sent to the requesting viewing-control device because an attached viewing device is found authorized to receive the data file.

9. A hierarchical multimedia (MM) distribution system for supporting "on demand" control of graphical data files being received by viewing-control devices connected to a network as defined in claim 8, further comprising

a stop command being processed by the MM processor and forwarded to the host computer system for processing transmission-termination information for the viewing-control device, and the host computer system signalling the MM processor to stop reading and sending blocks of the requested data file to the viewing-control device.

10. A hierarchical multimedia (MM) distribution system for supporting "on demand" control of graphical data files being received by viewing-control devices connected to a network as defined in claim 2, further comprising

a next-block command being sent by the viewing-control device to the MM processor before a last block received by the viewing-control device has been completely transmitted by the viewing-control device to a TV set, and

the MM processor responding to the next-block command by transmitting any next block in the data file for reception by the viewing-control device before the last block has been completely transmitted by the viewing-control device to the TV set.

11. A hierarchical multimedia (MM) distribution system for supporting "on demand" control of graphical data files being received by viewing-control devices connected to a network as defined in claim 2, further comprising

a next-block command being sent by the viewing-control device to the MM processor to request a next data block when each data block is received and stored in a buffer at the viewing-control device while a last-received data block is being read and processed by the viewing-control device from another buffer.

12. A hierarchical multimedia (MM) distribution system for supporting "on demand" control of graphical data files being received by viewing-control devices connected to a network as defined in claim 10 or 11, further comprising

the MM processor testing for no last block being available from the data file in response to receiving each next-block command as part of the processing of the command by the MM processor, and

the MM processor inserting a data file end signal in the command and sending the command to the host computer system for termination processing of the data file for the viewing-control device.

13. A hierarchical multimedia (MM) distribution system for supporting "on demand" control of graphical data files being received by viewing-control devices connected to a network as defined in claim 2, further comprising

a viewing-control command being sent by the viewing-control device to the MM processor to request a change in the viewing presentation at the viewing-control device, and

the MM processor controlling a selected disk to select the next block in a data file to be sent to the viewing-control device according to a control indication put in the command-control block by the viewing-control device.

14. A hierarchical multimedia (MM) distribution system for supporting "on demand" control of graphical data files being received by viewing-control devices connected to a network as defined in claim 13, further comprising

a fast-forward command indication being provided in a command control block sent to the MM processor as the viewing-control command,

the MM processor receiving the fast-forward command and controlling a selection of a forward data block by forward incrementing the data file by a predetermined number of data blocks from a last data block transmitted to the viewing-control device, and

the MM processor continuing transmission of the data file to the viewing-control device from the forward data block.

15. A hierarchical multimedia (MM) distribution system for supporting "on demand" control of graphical data files being received by viewing-control devices connected to a network as defined in claim 13, further comprising

a fast-backward (rewind) command indication being provided in a command control block sent to the MM processor as the viewing-control command,

the MM processor receiving the fast-backward command and controlling a selection of a backward data block by backward incrementing the data file by a predetermined number of data blocks from a last data block transmitted to the viewing-control device, and

the MM processor continuing transmission of the data file to the viewing-control device from the backward data block.

16. A hierarchical multimedia (MM) distribution system for supporting "on demand" control of graphical data files being received by viewing-control devices connected to a network as defined in claim 13, further comprising

a pause command indication being provided in a command control block sent to the MM processor as the viewing-control command,

the MM processor receiving the pause command terminating further transmission of any data block in the data file to the viewing-control device until a no-pause command is received from the viewing-control device, and

the viewing-control device repeating a reading of data from a buffer for a last picture displayed by an associated viewing device.