DATA-RATE ADJUSTING DEVICE, DATA FEEDING SYSTEM, AND COMPUTER-READABLE MEDIUM

• US 20110013702A1
• Filed: 06/21/2010
• Published: 01/20/2011
• Est. Priority Date: 07/15/2009
• Status: Abandoned Application

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: FUJITA, Shin
• Application Number:
  US12/819,369
• Publication Number:
  US 20110013702A1
• Time in Patent Office: Days
• US Class Current: 375/240.26
• CPC Class Codes: H04N 21/23611 Insertion of stuffing data into a multiplex stream, e.g. to obtain a constant bitrate synchronisation arrangements in time-division multiplex systems using bit stuffing for systems with different or fluctuating information rates H04J3/073

Abstract

A data-rate adjusting device includes a first processing unit that adjusts a data rate for outputting an input data string by adding a bit string to the data string, the bit string being different from a predetermined bit string having a predetermined number of consecutive bits of an identical value and a second processing unit that outputs, to a data transmitting device, the data string to which the bit string is added.

Claims

1. A data-rate adjusting device, comprising:

a first processing unit that adjusts a data rate for outputting an input data string by adding a bit string to the data string, the bit string being different from a predetermined bit string having a predetermined number of consecutive bits of an identical value; and

a second processing unit that outputs, to a data transmitting device, the data string to which the bit string is added.

2. The data-rate adjusting device according to claim 1, wherein the predetermined data string comprises flag data added to the data string transmitted by a transmitting unit in the data transmitting device and used for data string transmission in flag synchronization control.

3. The data-rate adjusting device according to claim 1, wherein the data string is a transport stream specified for a data multiplexing system by an MPEG-2 system standard, and

the first processing unit adjusts the data rate by adding a transport stream packet having a payload containing the bit string to the transport stream.

4. The data-rate adjusting device according to claim 3, wherein the first processing unit sets a packet identifier to a value indicating a null packet, the packet identifier being contained in header information of the transport stream packet and being indicative of a type of data stored in the payload in the transport stream packet.

5. The data-rate adjusting device according to claim 1, wherein the data string is a collection of network-abstraction-layers containing encoded video data, the network-abstraction-layers being specified by an H.264 standard, and

the first processing unit adjusts the data rate by adding a network-abstraction-layer unit containing the bit string to a collection of the network-abstraction-layer units that are the data strings.

6. The data-rate adjusting device according to claim 5, wherein the first processing unit adjusts the data rate by adding, to a collection of network-abstraction-layer units that are the data stings, a supplemental-enhancement-information-network-abstraction-layer that is one type of network-abstraction-layer unit specified by the H.264 standard, the supplemental-enhancement-information-network abstraction-layer containing the bit string.

7. The data-rate adjusting device according to claim 6, wherein the first processing unit sets a payload type to a value indicating user data as unregistered, the payload type being contained in header information of the supplemental-enhancement-information-network-abstraction-layer and being indicative of a data-containing structure of the supplemental-enhancement-information-network-abstraction-layer.

8. The data-rate adjusting device according to claim 5, wherein the first processing unit adjusts the data rate by adding a payload in a network-abstraction-layer unit defined by the H.264 standard as being unspecified, the payload containing the bit string, to a collection of network-abstraction-layer units that are the data strings.

9. A non-transitory computer-readable medium for recording a program allowing a computer to execute the steps of:

obtaining a data string;

creating a bit string, that is different from a predetermined bit string having a predetermined number of consecutive bits of an identical value;

adjusting a data rate for outputting the data string by adding the created bit string to the obtained data string; and

outputting the data string having the adjusted data rate to a data transmitting device.

10. The computer-readable medium according to claim 9, wherein the predetermined bit string comprises flag data to be added to a data string output by the data transmitting device and to be used for data string transmission in flag synchronization control.

11. The computer-readable medium according to claim 9, wherein the data string is a transport stream specified for a data multiplexing system by an MPEG-2 system standard, and

in the adjustment, the data rate is adjusted by adding, to the transport stream, a transport stream packet having a payload that contains a bit string that does not include the predetermined bit string.

12. The computer-readable medium according to claim 11, wherein in the adjustment, a packet identifier that is contained in header information of the transport stream packet and that is indicative of a type of data stored in the payload in the transport stream packet is set to a value indicating a null packet.

13. The computer-readable medium according to claim 9, wherein the data string is a collection of network-abstraction-layers containing encoded video data, the network-abstraction-layers being specified by an H.264 standard, and

in the adjustment, the data rate is adjusted by adding, to a collection of the network-abstraction-layer units that are the data strings, a network-abstraction-layer unit containing a bit string that does not include the predetermined bit string.

14. The computer-readable medium according to claim 13, wherein in the adjustment, the data rate is adjusted by adding, to a collection of network-abstraction-layer units that are the data stings, a supplemental-enhancement-information-network-abstraction-layer that is one type of network-abstraction-layer unit specified by the H.264 standard, the supplemental-enhancement-information-network-abstraction-layer containing a bit string that does not include the predetermined bit string.

15. The computer-readable medium according to claim 14, wherein in the adjustment, a payload type is set to a value indicating user data as unregistered, the payload type being contained in header information of the supplemental-enhancement-information-network-abstraction-layer and being indicative of a data-containing structure of the supplemental-enhancement-information-network-abstraction-layer.

16. The computer-readable medium according to claim 13, wherein in the adjustment, the data rate is adjusted by adding, to a collection of network-abstraction-layer units that are the data strings, payload in a type of network-abstraction-layer unit defined by the H.264 standard as being unspecified, the payload containing a bit string that does not include the predetermined bit string.

17. A data feeding system, comprising:

a data transmitting device including;

a transmitting unit that transmits an input data string, and

a bit stuffing unit that inserts, when the data string to be transmitted by the transmitting unit contains a predetermined bit string having a predetermined number of consecutive bits of an identical value, a bit next to the predetermined bit string in the data string, the bit having a different value from the identical value; and

a data-rate adjusting device including;

a first processing unit that adjusts a data rate for outputting the data string input to the data transmitting device, by adding a bit string that is different from the predetermined bit string to the data string, and

a second processing unit that outputs, to the data transmitting device, the data string to which the bit string is added.