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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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Presentation Transcript
dvb si update overview
DVB SI Update: Overview
  • What is Service Information?
  • Features of DVB Service Information
  • Specification Status and Developments
dvb si update what is si
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
dvb si features
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
dvb si model

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
si features nit
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
si features sdt bat
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”
si features eit
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
si features tdt tot rst
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
dvb si specification status
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
dvb si specification status 2
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