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DVB Update: Service Information

DVB Update: Service Information. Martin Gold NDS. DVB SI Update: Overview. What is Service Information? Features of DVB Service Information Specification Status and Developments. DVB SI Update: What is SI?. Operates in conjunction with PSI (defined by MPEG):

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DVB Update: Service Information

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  1. DVB Update: Service Information Martin Gold NDS

  2. DVB SI Update: Overview • What is Service Information? • Features of DVB Service Information • Specification Status and Developments

  3. DVB SI Update: What is SI? • Operates in conjunction with PSI (defined by MPEG): • SI data provides information for: • Automatic tuning to transport stream • User Information for Service, “Event”, and “Component” selection • PSI data provides information for: • Configuration of decoder for selected Service • DVB extensions for non-MPEG components

  4. DVB SI Features • Data structured as several “Tables” • Structures use “fixed format” for essential data, and descriptors for optional or variable-length data (similar to PSI) • Efficient data transmission • Extensible while maintaining compatibility • Support for “private” extensions • Can provide standard EPG data-stream • “Look and Feel” determined by receiver software • Resident or Downloaded

  5. Networks Satellite Cable Terrestrial Transport Streams Transponder 2 Transponder 3 Channel 2 Channel C Transponder 1 Channel 1 Channel 2 Channel C Transponder T Channel 1 Services Bouquet Service 1 Service 2 Service S Service 1 Service 2 Service S Service 1 Service 2 Service 3 Service S Components Video Audio 1 Audio 2 Data DVB SI Model

  6. SI Features: NIT • Network Information Table • Identification of transmission as a member of a group of multiplexes - “Network” • Network Name • Tuning parameters with support for various delivery media • List of additional frequencies for terrestrial transmission • Designed for simple transcoding of transport streams

  7. SI Features: SDT & BAT • Service Description Table • Identifies Service names and Service types • Linked Services • Pointer to MPEG Program in PSI • Service_id = MPEG Program Number • Bouquet Association Table (Optional) • Groupings of Services • May convey “logical channel number”

  8. SI Features: EIT • Present/Following • Information on current and next events • Schedule (optional) • Up to 64 days ahead - ordered by service and time • Event Information • Title, short description • Start time & duration • Content classification & parental rating • Longer text description • Information on components

  9. SI Features: TDT,TOT, RST • Time and Date Table • Transmission of current time for automatic setting of receiver clock • Time Offset Table (optional) • Transmission of time offset by zone - both current, and next offset values, with date at which next occurs • Running Status Table (optional) • Mechanism for signalling status transitions with greater timing precision

  10. Example EPG using DVB SI

  11. DVB SI Specification Status • October 95: Edition 1 ETS 300 468 • January 97: Edition 2 ETS 300 468, added • Time Offset Table • Multilingual and Unicode Support • Extension to content description • Support for DVB Subtitling • Incorporated from SI Guidelines • Private Data Specifier Mechanism • Service Move • Service bit-rate signalling

  12. DVB SI Specification Status (2) • January 98: V1.3.1 EN 300 468, added • Support for Terrestrial transmission • SI for recorded “partial” bitstreams • Support for Data Broadcasting • Agreed additions for next edition (V1.4.1) • HD Video component description • Support for AC-3 audio • Use of Transport Stream Description Table • PSI descriptor for Data Broadcasting • Support for 6MHz terrestrial channels • Support for VBI data extensions

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