Method and system for transmitting packages of data

• US 5,227,876 A
• Filed: 06/05/1990
• Issued: 07/13/1993
• Est. Priority Date: 06/07/1989
• Status: Expired due to Term

• Current Assignee: Alcatel Italia SpA (Nokia Corporation)
• Original Assignee: Telettra Telefonia Elettronica E Radio SPA
• Inventors: Barbero, Marzio, Cucchi, Silvio
• Primary Examiner(s): Groody, James J.
• Assistant Examiner(s): Metjahic, Safet
• Application Number:
  US07/533,572
• Time in Patent Office: 1,134 Days
• Field of Search: 358/136, 358/135, 358/133, 358/13, 358/134, 358/142, 358/146, 358/143, 375/33, 375/40, 375/122, 370/83, 370/84, 370/118, 370/60, 370/58.1, 370/61, 370/68
• US Class Current: 370/235
• CPC Class Codes: H04N 19/00 Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
• CPC Class Codes: H04N 19/152 by measuring the fullness of the transmission buffer
• CPC Class Codes: H04N 19/30 using hierarchical techniques, e.g. scalability H04N19/63 takes precedence
• CPC Class Codes: H04N 19/50 using predictive coding H04N19/61 takes precedence
• CPC Class Codes: H04N 19/593 involving spatial prediction techniques
• CPC Class Codes: H04N 19/61 in combination with predictive coding
• CPC Class Codes: H04N 19/70 characterised by syntax aspects related to video coding, e.g. related to compression standards
• CPC Class Codes: H04N 21/23655 Statistical multiplexing, e.g. by controlling the encoder to alter its bitrate to optimize the bandwidth utilization
• CPC Class Codes: H04N 21/4347 Demultiplexing of several video streams

Abstract

A system and method for organizing and processing signals from multiple sources subdivides the source data into a plurality of processing paths. The data is stored in a buffer on each path in packages having fixed length words. A buffer controller controls drawing of the packages to a multiplexer and prevents underflow and overflow in each of the buffers. The multiplexer combines the data packages from each path and from each source according to a generation time priority. Each package includes a heading indicating its source and destination paths. The packages are transmitted along a transmission line, and the data is demultiplexed and outputted according to the headings.

Claims

1. A method of processing data for transmission from a plurality of sources, comprising the steps of:

receiving data input from said sources;

dividing said data into a plurality of paths for encoding and storage;

encoding said data with an encoder on each path to generate variable length words, said variable length words being organized into packages;

adding to said packages a heading indicating the source and destination paths of the data in the packages;

storing said packages in a buffer on each path;

retrieving and forwarding said packages from said buffer to a multiplexer under control of a buffer controller, said buffer controller preventing underflow and overflow of said buffers;

multiplexing said packages from the plurality of paths of each of said sources; and

transmitting said multiplexed packages of data along a transmission line.

2. A method according to claim 1, wherein said packages are outputted from said encoder at a variable time rate.

3. A method according to claim 2, wherein said variable time rate is a function of the complexity of the data.

4. A method according to claim 1, wherein said encoder encodes data sequences of zeroes and attributes different length words corresponding to a number of zeroes forming the sequences.

5. A method according to claim 1, wherein said buffer stores packages from all of said paths.

6. A method according to claim 1, further comprising the steps of:

receiving said packages of data from said transmission line;

demultiplexing said packages of data into a plurality of paths for each output destination, said data packages being redistributed in accordance with said heading;

decoding said packages into individual data bits; and

7. A method according to claim 1, wherein said packages with said heading added, have a fixed length.

8. A method according to claim 1, wherein said data packages include words for signalling errors caused by the transmission line.

9. A method according to claim 1, further comprising the steps of:

collecting lateral information corresponding to data input received from said source, data from said encoder corresponding to each of said paths, and data form said buffer controller; and

transmitting said lateral information to said multiplexer for controlling the multiplexing of said packages.

10. A system for organizing and processing data from a plurality of sources, said system comprising:

an interface for each source for receiving data input from said source and for dividing said data into a plurality of paths;

an encoder on each of said paths for encoding data into packages having fixed length words, said packages including a heading indicating the source and destination paths of said packages;

a buffer on each of said paths for storing said packages;

a buffer controller for assuring that said packages are retrieved from each of said buffers in accordance with the time order or their generation and for preventing underflow and overflow of said buffers; and

a multiplexer for receiving said retrieved packages and multiplexing said packages from the plurality of paths of each of said sources according to a generation priority and for transmitting said multiplexed packages of data along a transmission line.

11. A system according to claim 10, wherein a single buffer stores said packages from all of said paths.

12. A system according to claim 10, further comprising:

a demultiplexer for receiving said packages of data from said transmission line and demultiplexing said packages of data into a plurality of paths for each output destination, said data packages being redistributed according to said heading;

a decoder on each of said paths for decoding said packages into individual data bits; and

means for outputting said data bits.

13. A system according to claim 10, further comprising means for collecting lateral information corresponding to data input received from said interface, data from each said encoders, and data from said buffer controller and for transmitting said collected information to said multiplexer to control the multiplexing of said packages.