GB2393084A - Monitoring event information tables (EITs) of a compressed transport stream - Google Patents

Monitoring event information tables (EITs) of a compressed transport stream Download PDF

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Publication number
GB2393084A
GB2393084A GB0221071A GB0221071A GB2393084A GB 2393084 A GB2393084 A GB 2393084A GB 0221071 A GB0221071 A GB 0221071A GB 0221071 A GB0221071 A GB 0221071A GB 2393084 A GB2393084 A GB 2393084A
Authority
GB
United Kingdom
Prior art keywords
transport stream
eits
absence
event information
consecutive
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB0221071A
Other versions
GB0221071D0 (en
Inventor
Matthew Towler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tektronix International Sales GmbH
Original Assignee
Tektronix International Sales GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tektronix International Sales GmbH filed Critical Tektronix International Sales GmbH
Priority to GB0221071A priority Critical patent/GB2393084A/en
Publication of GB0221071D0 publication Critical patent/GB0221071D0/en
Priority to US10/658,992 priority patent/US7894533B2/en
Priority to EP03255697A priority patent/EP1398957B1/en
Priority to DE60336105T priority patent/DE60336105D1/en
Publication of GB2393084A publication Critical patent/GB2393084A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/434—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
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T9/00—Image coding
    • G06T9/007—Transform coding, e.g. discrete cosine transform

Abstract

A compressed transport stream (20 Fig. 3) is analysed 34 to determine the presence or absence of a predetermined number, e.g. at least the first four, of consecutive Event Information Tables (EITs) or programs transmitted in the transport stream in consecutive periods of time including a current EIT of programs currently being transmitted. The transport stream is received 31 to identify, in the transport stream, a master guide table (MGT) 32 containing a transport stream type identifier (101 fig. 1), e.g. a (Terrestrial Virtual Channel table) TVCT identifier, and a list of EITs (102 Fig. 1) purportedly in the transport stream. The MGT is analysed to determine the presence or absence of a terrestrial transport stream identifier 33 and if present the presence or absence of a predetermined number of consecutive EITs including a current EIT 34. A representation of the analysis results is output to a user interface.

Description

Monitoring Event Information Tables of a compressed transport stream.
This invention relates to a method of monitoring Event Information Tables of a compressed transport stream, and in particular of, but not restricted to, MPEG-2 based 5 streams.
A compressed transport stream, for example a MPEG-2 transport stream, typically carries multiple programs or services. It is known for such transport streams to carry up to 150 services. The transport stream comprises service elements in packets, each packet being identified by a Packet Identifier. Included as packets in the 10 transport stream may be Master Guide Tables (MGTs), which list Packet Identifiers (PIDs) for all other tables which should be present in the transport stream apart from a System Time Table. ATSC Standard A/65 "Program and System Formation Protocol for Terrestrial Broadcast and Cable" requires the presence in transport streams for terrestrial transmission of an MGT and also of four Event Information 15 Tables KIT-0, KIT-1, KIT-2 and KIT-3. Terrestrial transport streams are recognisable by the presence of a Terrestrial Virtual Channel Table (TVCT) type entry. The Event Information Guides list the programs to be transmitted in each of 3-hour sessions, KIT-0 being the current session and KIT-1 the next 3-hour session and so on. Other EITs for later periods of time, for example up to a weeks programming, may 20 optionally also be included. There is no requirement in the standard for EITs in satellite or cable transport streams.
However, it is not necessarily known a priori when testing a transport stream whether it is a terrestrial transport stream. Even if it is known, there are no guidelines in the standard on how to monitor whether a terrestrial transport stream meets the 25 standard in respect of the presence of EITs.
It is an object of the present invention to provide a test method and apparatus for verifying conformance with this requirement.
According to a first aspect of the invention there is provided a method of testing a compressed transport stream comprising the steps of: receiving the transport stream; 30 identifying, in the transport stream, a master guide table (MOT) containing a transport
stream type identifier and a list of event information tables (EITs) in the transport stream; analysing the MGT to determine the presence or absence of a terrestrial transport stream identifier and if present the presence or absence of a predetermined number of consecutive Event Information Tables including a current Event 5 Information Table; and outputting results of the analysis.
According to a second aspect of the invention, there is provided a test apparatus for a compressed transport stream comprising: receiver means for receiving the transport stream; identifier means for identifying, in the transport stream, a master guide table (MOT) containing a transport stream type identifier and a list of event 10 information tables (EITs) in the transport stream; analyser means for analysing the MGT to determine the presence or absence of a terrestrial transport stream identifier and if present the presence or absence of a predetermined number of consecutive Event Information Tables including a current Event Information Table; and user interface means for outputting results of the analysis.
15 The invention will now be described, by way of example, with reference to the accompanying drawings, in which: Figure 1 is a conceptual diagram of a Master Guide Table of a transport stream suitable for analysis by the invention; Figure 2 is a flowchart of steps of the present invention; and 20 Figure 3 is a conceptual diagram of the apparatus of the invention.
Referring to Figure 1, a transport stream contains a Master Guide Table 10, identified as such by Packet Identifier = IFFY, containing, inter alla, a table type 110 for a terrestrial transport stream and a list of Event Information Tables including the Event Information Table type 102 and the corresponding Packet Identifier (PID) 103 25 in the transport stream As shown in Figures 2 and 3, in the test of the invention, steps are carried out to determine that all required Event Information Tables are present in the transport stream.
I A transport stream is received, step 31, by a receiver 41 and a Master Guide Table 10 is identified, step 32, for example by a packet identifier being equal to hexadecimal l FFB and containing a section with a table id Oxc7.
The instance of a Master Guide Table from the transport stream is analysed, step 5 33 to determine whether a TCVT indicator is present indicating that the transport stream is a terrestrial transport stream. If no TCVT indicator is found the test ends because the requirement for EITs applies only to terrestrial transport streams.
If the transport stream is determined to be a terrestrial transport stream the MGT is further analysed, step 34, for the presence of at least the first four EITs for the 10 current time slot and the next three 3- hour time slots respectively. If the first four EITs are not present an alert or other warning is provided on a user interface 46.
Reparative action may then be initiated.
It will be apparent that the invention has applicability not only to ATSC systems
but also at least to other transport streams having MPEG-2 based compression.

Claims (4)

1. A method of testing a compressed transport stream comprising the steps of: a. receiving the transport stream; b. identifying, in the transport stream, a master guide table (MOT) for containing a transport stream type identifier and a list of event information tables (EITs) of programs transmitted in the transport stream in consecutive periods of time; c. analysing the MGT to determine the presence or absence of a terrestrial transport stream type identifier and if present the presence or absence of a predetermined number of consecutive EITs including a current KIT of programs currently being transmitted; and d. outputting signals representative of results of the analysis to a user interface.
2. A test apparatus for a compressed transport stream comprising: receiver means for receiving the transport stream; identifier means for identifying, in the transport stream, a master guide table (MOT) for containing a transport stream type identifier and a list of event information tables (EITs) of programs transmitted in the transport stream in consecutive periods of time; analyser means for analysing the MGT to determine the presence or absence of a terrestrial transport stream type identifier and if present the presence or absence of a predetermined number of consecutive EITs including a current KIT of programs currently being transmitted; and user interface means in communication with the analyser means for receiving signals representative of results of the analysis.
3. A method substantially as herein described with reference to and as shown in the accompanying drawings.
4. A test apparatus substantially as herein described with reference to and as shown in the accompanying drawings.
GB0221071A 2002-09-11 2002-09-11 Monitoring event information tables (EITs) of a compressed transport stream Withdrawn GB2393084A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB0221071A GB2393084A (en) 2002-09-11 2002-09-11 Monitoring event information tables (EITs) of a compressed transport stream
US10/658,992 US7894533B2 (en) 2002-09-11 2003-09-10 Analyzing a transport stream
EP03255697A EP1398957B1 (en) 2002-09-11 2003-09-11 Method and apparatus for analyzing a transport stream
DE60336105T DE60336105D1 (en) 2002-09-11 2003-09-11 Method and apparatus for analyzing a transport stream

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0221071A GB2393084A (en) 2002-09-11 2002-09-11 Monitoring event information tables (EITs) of a compressed transport stream

Publications (2)

Publication Number Publication Date
GB0221071D0 GB0221071D0 (en) 2002-10-23
GB2393084A true GB2393084A (en) 2004-03-17

Family

ID=9943861

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0221071A Withdrawn GB2393084A (en) 2002-09-11 2002-09-11 Monitoring event information tables (EITs) of a compressed transport stream

Country Status (1)

Country Link
GB (1) GB2393084A (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999003266A1 (en) * 1997-07-10 1999-01-21 Thomson Consumer Electronics, Inc. A system for forming and processing program specific information containing text data for terrestrial, cable or satellite broadcast
WO2001005157A2 (en) * 1999-07-13 2001-01-18 Thomson Licensing S.A. System for program specific information error management in a video decoder
CA2323647A1 (en) * 1999-10-19 2001-04-19 Lg Electronics Inc. Master guide table for a digital broadcast protocol and method of broadcasting and receiving broadcast signals using the table

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999003266A1 (en) * 1997-07-10 1999-01-21 Thomson Consumer Electronics, Inc. A system for forming and processing program specific information containing text data for terrestrial, cable or satellite broadcast
WO2001005157A2 (en) * 1999-07-13 2001-01-18 Thomson Licensing S.A. System for program specific information error management in a video decoder
CA2323647A1 (en) * 1999-10-19 2001-04-19 Lg Electronics Inc. Master guide table for a digital broadcast protocol and method of broadcasting and receiving broadcast signals using the table

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
http://www.digitaltelevision.com/2001/weekly/0321_0328/0321_0328.4.shtml, Digital Television.com, "PSIP is key to DTV implementation", Jerry Whitaker, 15/05/2001 *

Also Published As

Publication number Publication date
GB0221071D0 (en) 2002-10-23

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)