TRANSMISSION DEVICE, TRANSMISSION METHOD, AND PROGRAM FOR THE SAME

• US 20100202309A1
• Filed: 02/04/2010
• Published: 08/12/2010
• Est. Priority Date: 02/06/2009
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Suneya, Toru
• Granted Patent: US 8,503,444 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04L 1/0057 Block codes H04L1/0061, H04L1/0064 take precedence
• CPC Class Codes: H04L 1/007 Unequal error protection for format H04L1/0078; for codes per se H03M13/35
• CPC Class Codes: H04L 1/0083 Formatting with frames or packets; Protocol or part of protocol for error control

Abstract

A transmission apparatus is provided, including a combination determination unit configured to determine combinations of data packets so that when a data packet in a first frame is missed in transmission, a recover packet (FEC packet) for recovering the missing data packet is generated based on data packets in the first frame and data packets in a second frame, and an error correction coding unit configured to generate a recover packet based on the determination made by the combination determination unit.

Claims

1. A transmission apparatus configured to transmit data packets of moving image data to a receiving apparatus, the data packets constituting a plurality of frames of the divided moving image data, comprising:

a determination unit configured to determine a coding type for determining whether a first frame of the plurality of frames is coded without reference to other frame data;

a generation unit configured to generate a recover packet that is used, when a data packet in the first frame is missed in transmission, by a receiving apparatus to recover the missing data packet, based on data packets in the first frame and data packets in a second frame having the same coding type as that of the first frame; and

a transmission unit configured to transmit the data packets and the recover packet.

2. The transmission apparatus according to claim 1, wherein the generation unit generates a recover packet containing identification information of the data packets in the first frame and identification information of the data packets in the second frame.

3. The transmission apparatus according to claim 1, further comprising an input unit configured to input data of the first frame, data of the second frame that is reproduced later than the data of the first frame, and data of a third frame that is reproduced later than the data of the second frame,

wherein the generation unit generates a recover packet for recovering the missing data packet in the first frame based on data packets in the first frame and data packets in the second frame, and generates a recover packet for recovering the missing data packet in the second frame based on data packets in the second frame and data packets in the third frame.

4. The transmission apparatus according to claim 1, wherein the generation unit generates a first recover packet that is used by the receiving apparatus to recover a missing first data packet in the first frame, based on a first data packet in the first frame and a data packet in the second frame, and generates a second recover packet that is used by the receiving apparatus to recover the first missing data packet in the first frame, based on the first data packet in the first frame and a second data packet in the first frame.

5. The transmission apparatus according to claim 1, further comprising an input unit configured to input data of the first frame, data of the second frame that is reproduced later than the data of the first frame, and data of the third frame that is reproduced later than the date of the second frame, and

a determination unit configured to determine the number of successively missed data packets in frames transmitted before the first frame,

wherein the generation unit generates a recover packet for recovering data packets in the first frame when a first number of packets are successively missed in transmission, based on data packets in the first frame and data packets in the second frame, and generates a recover packet for recovering data packets in the first frame, when a second number of packets are successively missed in transmission, the second number greater than the first number, based on data packets in the first frame and data packets in the third frame.

6. The transmission apparatus according to claim 1, further comprising an input unit configured to input data of the first frame, data of the second frame that is reproduced later than the data of the first frame, and data of the third frame that is reproduced later than the data of the second frame,

wherein the generation unit generates a recover packet for recovering data packets in the first frame based on the data packets in the first frame and the data packets in the second frame when there is a first difference between a transmission time and a reproduction time of data packets in the first frame, and generates a recover packet for recovering data packets in the first frame based on data packets in the first frame and data packets in the third frame when there is a second difference between a transmission time and a reproduction time of data packets in the first frame, the second difference being longer than the first difference.

7. A method implemented by a transmission apparatus configured to transmit data packets of moving image data to a receiving apparatus, the data packets constituting a plurality of frames of the divided moving image data, the method comprising:

determining a coding type for determining whether a first frame of the plurality of frames is coded without reference to other frame data;

generating a recover packet that is used, when a data packet in the first frame is missed in transmission, by a receiving apparatus to recover the missing data packet, based on data packets in the first frame and data packets in a second frame having the same coding type as that of the first frame; and

transmitting the data packets and the recover packet.

8. The method according to claim 7, further comprising generating the recover packet containing identification information of data packets in the first frame and identification information of data packets in the second frame.

9. The method according to claim 7, further comprising inputting data of the first frame, data of the second frame that is reproduced later than the data of the first frame, and data of a third frame that is reproduced later than the data of the second frame,

wherein, a recover packet for recovering the missing data packet in the first frame is generated based on data packets in the first frame and data packets in the second frame, and a recover packet for recovering the missing data packet in the second frame is generated based on data packets in the second frame and data packets in the third frame.

10. The method according to claim 7, wherein, a first recover packet used by the receiving apparatus to recover the missing first data packet in the first frame is generated based on a first data packet in the first frame and a data packet in the second frame, and a second recover packet used by the receiving apparatus to recover the first missing data packet in the first frame is generated based on the first data packet in the first frame and a second data packet in the first frame.

11. The method according to claim 7, further comprising inputting data of the first frame, data of the second frame that is reproduced later than the data of the first frame, and data of the third frame that is reproduced later than the data of the second frame;

and

determining the number of successively missed data packets in the frames transmitted before the first frame,

wherein, recover packets for recovering data packets in the first frame are generated based on data packets in the first frame and data packets in the second frame, when a first number of packets are successively missed in transmission, and recover packets for recovering data packets in the first frame are generated based on data packet in the first frame and data packets in the third frame, when a second number of packets are successively missed in transmission, the second number being greater than the first number.

12. A computer-readable storage medium that stores a program implemented by a computer for transmitting data packets of moving image data to a receiving apparatus, the data packets constituting a plurality of frames of the divided moving image data, the program comprising:

determining a coding type which for determining whether a first frame of the plurality of frames is coded without reference to other frame data;

generating a recover packet that is used, when a data packet in the first frame is missed in transmission, by a receiving apparatus to recover the missing data packet, based on data packets in the first frame and data packets in a second frame having the same coding type as that of the first frame; and

transmitting the data packets and the recover packet.

13. The computer-readable storage medium according to claim 12, further comprising generating recover packet containing identification information of data packets in the first frame and identification information of data packets in the second frame.

14. The computer-readable storage medium according to claim 12, further comprising inputting data of the first frame, data of the second frame that is reproduced later than the data of the first frame, and data of a third frame that is reproduced later than the data of the second frame,

wherein, a recover packet for recovering the missing data packet in the first frame is generated based on data packets in the first frame and data packets in the second frame, and a recover packet for recovering the missing data packet in the second frame is generated based on data packets in the second frame and data packets in the third frame.

15. The computer-readable storage medium according to claim 12, wherein, a first recover packet used by the receiving apparatus to recover the missing first data packet in the first frame is generated based on a first data packet in the first frame and a data packet in the second frame, and a second recover packet used by the receiving apparatus to recover the first missing data packet in the first frame is generated based on the first data packet in the first frame and a second data packet in the first frame.

16. The computer-readable storage medium according to claim 12, further comprising:

inputting data of the first frame, data of the second frame that is reproduced later than the data of the first frame, and data of the third frame that is reproduced later than the data of the second frame; and

determining the number of successively missed data packets in the frames transmitted before the first frame,

wherein, recover packets for recovering data packets in the first frame are generated based on data packets in the first frame and data packets in the second frame, when a first number of packets are successively missed in transmission, and recover packets for recovering data packets in the first frame is generated based on data packet in the first frame and data packets in the third frame, when a second number of packets are successively missed in transmission, the second number being greater than the first number.

17. A transmission apparatus configured to transmit data packets of moving image data to a receiving apparatus, the data packets constituting a plurality of frames of the divided moving image data, comprising:

a generation unit configured to generate a recover packet that is used, when a first data packet corresponding to a first position in a first frame is missed in transmission, by a receiving apparatus to recover the missing first data packet, based on the first data packet in the first frame and a second data packet in a second frame at a position corresponding to the first position; and

a transmission unit configured to transmit the data packets and the recover packet.

18. A method implemented by a transmission apparatus configured to transmit data packets of moving image data to a receiving apparatus, the data packets constituting a plurality of frames of the divided moving image data, the method comprising:

generating a recover packet that is used, when a first data packet corresponding to a first position in a first frame is missed in transmission, by a receiving apparatus to recover the missing first data packet, based on the first data packet in the first frame and a second data packet in a second frame at a position corresponding to the first position; and

transmitting the data packets and the recover packet.

19. A computer-readable storage medium that stores a program implemented by a computer for transmitting data packets of moving image data to a receiving apparatus, the data packets constituting a plurality of frames of the divided moving image data, the program comprising:

generating a recover packet that is used, when a first data packet at a first position corresponding to a first frame is missed in transmission, by a receiving apparatus to recover the missing first data packet, based on the first data packet in the first frame and a second data packet in a second frame at a position corresponding to the first position; and

transmitting the data packets and the recover packet.