Apparatus and method for demultiplexing of transport stream

• US 6,970,482 B2
• Filed: 04/24/2001
• Issued: 11/29/2005
• Est. Priority Date: 07/14/2000
• Status: Expired due to Term

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Sung-tae
• Primary Examiner(s): NGUYEN, BRIAN D
• Application Number:
  US09/840,148
• Publication Number:
  US 20020015426A1
• Time in Patent Office: 1,680 Days
• Field of Search: 370/542, 370/536, 370/412, 370/428, 370/535, 370/401, 370/386, 370/463, 370/419, 370/537, 370/485, 370/486, 370/487, 370/488, 370/395.64
• US Class Current: 370/542
• CPC Class Codes: H04N 21/23608 Remultiplexing multiplex streams, e.g. involving modifying time stamps or remapping the packet identifiers
• CPC Class Codes: H04N 21/42615 involving specific demultiplexing arrangements
• CPC Class Codes: H04N 21/42623 involving specific decryption arrangements
• CPC Class Codes: H04N 21/4334 Recording operations recording of a television signal H04N5/76; arrangements for recording or accumulating broadcast information or broadcast-related information H04H60/27
• CPC Class Codes: H04N 21/434 Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream demultiplexing of data packets for data networks, e.g. RTP/UDP H04L65/00
• CPC Class Codes: H04N 21/4344 Remultiplexing of multiplex streams, e.g. by modifying time stamps or remapping the packet identifiers
• CPC Class Codes: H04N 21/4347 Demultiplexing of several video streams
• CPC Class Codes: H04N 21/43632 involving a wired protocol, e.g. IEEE 1394 high-speed IEEE 1394 serial bus H04L12/40052

Abstract

A transport stream (TS) demultiplexer has a TS input switch unit and an output switch unit, whereby inputs and outputs can be selected as desired, external output can be easily changed by changing selected information of the TS input switch unit and the output switch unit, without changing inputs. Therefore, the TS demultiplexer receives a plurality of TSs such as MPEG-2 TSs and DSS TSs, and can selectively demultiplex the TSs, and particularly, the TS demultiplexer can store the TSs in a storage medium such as a hard disc drive, or it can easily transmit the TS data over an IEEE1394 bus or a PCI bus.

Claims

1. A transport stream (TS) demultiplexer for demultiplexing a plurality of transport streams of data having different structures, the TS demultiplexer comprising:

a TS input switch unit selecting TS data to be processed among the plurality of TSs of data;

a packet identification (PID) filter unit extracting only packets of data having designated PIDs among the TS data selected in the TS input switch unit, and outputting the extracted packets as program data;

a descrambler unit descrambling selectively the program data output from the PID filter unit;

a first external output interface unit selecting desired program data from one of the program data provided by the PID filter unit and program data provided by the descrambler unit and outputting the selected program data;

a second external output interface unit grouping the program data, which is provided by the descrambler unit, into audio/video data and supplemental data, to process the audio/video data and the supplemental data, and outputting the audio/video data and the supplemental data; and

a CPU unit controlling operation of the TS input switch unit, the PID filter unit, the descrambler unit and the external output interface units to demultiplex the plurality of TSs of data.

2. The TS demultiplexer of claim 1, wherein the plurality of TS data comprises at least one of an MPEG-2 TS, a distributed sample scramble (DSS) TS, a TS over an IEEE1394 bus, and a TS over a PCI bus.

3. The TS demultiplexer of claim 1, wherein the TS input switch unit detects a synchronization signal for extracting header information of a packet in the selected TS.

4. The TS demultiplexer of claim 1, wherein the first external output interface comprises:

an output switch unit selectively extracting a desired portion of the program data among a larger amount of the program data transmitted from the PID filter or from the descrambler unit; and

a post-processing unit removing a predetermined packet or replacing the predetermined packet with a new packet to change program designation information of the program data selected by the output switch unit.

5. The TS demultiplexer of claim 4, wherein the first external output interface unit externally outputs program data through at least one of an IEEE 1394 bus and a CPI bus.

6. The TS demultiplexer of claim 1, wherein the first external output interface unit externally outputs program data through at least one of an IEEE1394 bus and a PCI bus.

7. The TS demultiplexer of claim 1, wherein the second external output interface unit comprises:

a buffer temporarily storing the program data provided from the descrambler unit;

an audio/video (A/V) decoder interface unit transmitting the audio/video data among the program data stored in the buffer, to an A/V decoder; and

a peripheral interface unit externally transmitting information data other than the audio/video data among the program data stored in the buffer.

8. The TS demultiplexer of claim 1, wherein the descrambler unit scrambles the descrambled program data for external transmission.

9. The transport stream demultiplexer of claim 1, wherein the packet identification filter unit further uses a synchronization signal received from the CPU to extract scramble information from a packet header and transmits the extracted scramble information to the CPU.

10. The transport stream demultiplexer of claim 1, wherein the descrambler unit scrambles program data when scrambling is needed.

11. The transport stream demultiplexer of claim 1, wherein the first external output interface unit or the second external interface unit outputs the program data after a predetermined packet has been removed therefrom or replaced with a new packet.

12. A method of simultaneously demultiplexing plural transport streams of data having different structures, comprising:

selecting a first transport stream data to be processed among the plural transport streams;

selecting a second transport stream data, having a different structure than the first transport stream data, among the plural transport streams;

extracting first packets of data having designated packet identification among the selected first transport stream data and second packets of data having designated packet identification among the selected second transport stream data;

modifying the extracted first and second packets as first and second program data, respectively;

descrambling a portion of at least one of the modified first and second program data; and

externally interfacing select program data among the first and second modified program data and the descrambled portion of the at least one of the modified first and second program data.

13. The method according to claim 12, wherein the plural transport streams of data having different structures is at least one of an MPEG-2 transport stream, a distributed sample scramble transport stream, a transport stream over an IEEE1394 bus, and a transport stream over a PCI bus.

14. The method according to claim 12, wherein the selecting the first and second transport stream data to be processed among the plural transport stream data further comprises extracting header information of a packet in each of the selected first and second transport stream data based upon a detected synchronization signal.

15. The method according to claim 14, wherein the externally interfacing of the select program data among the modified first and second program data and the descrambled portion of the at least one of the modified first and second program data further performs the operation of outputting the selected program data through at least one of an IEEE1394 bus and a PCI bus.

16. The method according to claim 12, wherein the externally interfacing of the select program data among the first and second modified program data and the descrambled portion of the at least one of the first and second modified program data further comprises grouping one of the descrambled first and second modified program data into audio/video data and supplemental data information to process audio/video data to be externally interfaced.

17. The method according to claim 16, wherein the externally interfacing of the select program data among the modified first and second program data and the descrambled portion of the at least one of the modified first and second program data further performs the operation of outputting the selected program data through at least one of an IEEE1394 bus or a PCI bus.

18. The method according to claim 16, wherein the grouping comprises:

temporarily storing the one of the descrambled first and second modified program data;

transmitting the audio/video data among the stored program data to an audio/video decoder; and

externally transmitting information data other than the audio/video data among the stored program data.

19. The method according to claim 12, further comprising scrambling the descrambled modified program data for external transmission.

20. The method according to claim 19, wherein said transport streams further include a transport stream received over an IEEE1394 bus and a transport steam received over a PCI bus.

21. A method of demultiplexing plural transport streams of data having different structures comprising:

selecting transport stream data to be processed among the plural transport streams;

extracting packets of data having designated packet identification among the plural transport stream data, and modifying the extracted packets as program data;

descrambling a portion of the modified program data;

selectively extracting desired program data among a larger amount of program data including the modified program data and the descrambled portion of the modified program data;

externally interfacing the desired program data among the modified program data and the descrambled portion of the modified program data; and

removing a predetermined packet or replacing the packet with a new packet to change program designation information of the desired program data selected to be externally interfaced.

22. A method of demultiplexing a plurality of transport streams of data having different structures comprising:

selecting first transport stream data having a first structure and second transport stream data having a second structure to be processed among the plurality of transport streams of data;

extracting first packets of data having designated packet identification among the selected first transport stream data and extracting second packets of data having designated packet identification among the selected second transport stream data, and modifying the extracted first and second packets as first program data and second program data;

descrambling a portion of the modified first and second program data; and

displaying the first program data selected by a user while simultaneously transmitting the second program data over an IEEE1394 bus.

23. The method according to claim 22, wherein the selected transport streams are stored in a hard disk drive.