Method and system for encoding or decoding a sequence of digital data

• US 7,861,144 B2
• Filed: 02/13/2009
• Issued: 12/28/2010
• Est. Priority Date: 06/18/2002
• Status: Expired due to Term

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Wagner, Marcel, Pandel, Jurgen, Weng, Wenrong, Liebl, Gunther
• Primary Examiner(s): Torres; Joseph D
• Application Number:
  US12/371,560
• Publication Number:
  US 20090144602A1
• Time in Patent Office: 683 Days
• Field of Search: 714/779, 714/774, 714/776
• US Class Current: 714/776
• CPC Class Codes: H03M 13/09 Error detection only, e.g. using cyclic redundancy check [CRC] codes or single parity bit
• CPC Class Codes: H03M 13/1515 Reed-Solomon codes
• CPC Class Codes: H03M 13/2707 Simple row-column interleaver, i.e. pure block interleaving
• CPC Class Codes: H03M 13/2915 with an error detection code in one dimension
• CPC Class Codes: H03M 13/35 Unequal or adaptive error protection, e.g. by providing a different level of protection according to significance of source information or by adapting the coding according to the change of transmission channel characteristics
• CPC Class Codes: H03M 13/356 Unequal error protection [UEP]
• CPC Class Codes: H03M 13/373 with erasure correction and erasure determination, e.g. for packet loss recovery or setting of erasures for the decoding of Reed-Solomon codes
• CPC Class Codes: H04L 1/0071 Use of interleaving interleaving per se H03M13/27
• CPC Class Codes: H04L 1/0072 Error control for data other than payload data, e.g. control data
• CPC Class Codes: H04L 1/0083 Formatting with frames or packets; Protocol or part of protocol for error control

Abstract

A method is provided for encoding and decoding a sequence of digital data, according to which a portion of the sequence of digital data corresponds to a data block that includes several data packets, at least two data packets per data block containing an identifier. The position of the data packet within the corresponding data block can be determined based on the identifier, and the data is encoded or decoded by taking into account the identifier.

Claims

1. A method for receiving a sequence of digital data, the method comprising:

receiving a data block of the sequence of digital data, the data block comprising transmission packets, each transmission packet having one of two headers and a data packet, the two headers being alternated between the transmission packets within the data block, wherein the first header of the two headers comprises a sequential number of the transmission packet and an identifier determining a position of the transmission packet within the data block, and the second header of the two headers comprises the sequential number of the transmission packet and a width of the data block;

unpacking the data packets corresponding to the data block; and

reading out digital data corresponding to the data block of the received sequence of digital data.

2. The method according to claim 1, wherein the method further comprises the following two steps after unpacking the data packets:

evaluating an interleaver block row-by-row to detect any data loss; and

restoring within the interleaver block any data loss by restoring transmission packets based on the sequential number of the transmission packet and either the identifier determining the position of the transmission packet within the data block or width of the data block in the alternated headers.

3. The method according to claim 1, wherein the sequence of digital data contains a sequence of digital image data or a sequence of progressive data.

4. The method according to claim 1, wherein the data block contains redundancy information.

5. The method according to claim 1, wherein a start and an end of the data block are determined via the sequential number of the transmission packet and either the identifier determining the position of the transmission packet within the data block or width of the data block in the alternated headers.

6. The method according to claim 1, wherein the identifier determining the position of the transmission packets within the data block is the sequential number of the transmission packet which is first in the data block.

7. The method according to claim 1, wherein a Real-Time Transfer Protocol is used as transmission protocol for receiving the sequence of digital data.

8. The method according to claim 7, wherein the sequential number of the transmission packets is determined from the first sequential number of the Real-Time Transfer Protocol used.

9. The method according to claim 1, wherein an unequal error protection method is used.

10. The method according to claim 9, wherein the unequal error protection method used is a UXP method.

11. A tangible computer readable storage medium storing computer program instructions which when executed on a programmable processor perform the steps of:

receiving a data block of the sequence of digital data, the data block comprising transmission packets, each transmission packet having one of two headers and a data packet, the two headers being alternated between the transmission packets within the data block, wherein the first header of the two headers comprises a sequential number of the transmission packet and an identifier determining a position of the transmission packet within the data block, and the second header of the two headers comprises the sequential number of the transmission packet and a width of the data block;

unpacking the data packets corresponding to the data block; and

reading out digital data corresponding to the data block of the received sequence of digital data.