Multimedia Standards

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1 Multimedia Standards SS 2012 Lecture 12 Prof. Dr.-Ing. Karlheinz Brandenburg Contact: Dipl.-Inf. Thomas Köllmer Dr.-Ing. Uwe Kühhirt 1

2 Preliminary list of lectures (Tuesday) SrHu 211/212 17: (Tuesday) SrHu 211/212 17: (Tuesday) SrHu 211/212 17: (Tuesday) SrHu 211/212 17: (Thursday) KHs 2 13: (Tuesday) SrHu 211/212 17: (Tuesday) SrHu 211/212 17: (Tuesday) SrHu 211/212 17: (Thursday) KHs 2 13: (Tuesday) SrHu 211/212 17: (Thursday) KHs 2 13: (Tuesday) SrHu 211/212 17: (Tuesday) SrHu 211/212 17: (Tuesday) SrHu 211/212 17:00 2

3 Application Standards DAB / DMB DVB (Europe) Video: MPEG-2, H.264/AVC Audio: MPEG Layer 2 ATSC - Advanced Television Systems Committe (USA) Video: MPEG-2 Audio: AC-3 ARIB - Association of Radio Industries and Businesses (Japan) Video: MPEG-2 Audio: MPEG-2 AAC DVD - Digital Versatile Disk 3

4 DAB - Digital Audio Broadcasting Overview: Eureka-147-project Founded in 1986 with 16 partners (A partners) International consortium consisting of: Broadcasters Network operators Consumer electronics industry Research institutes Opening the consortium for further partners:

5 DAB - Digital Audio Broadcasting Relevant Standards (ETSI/CENELEC/IEC): EN V1.3.3 (May 2001): Digital Audio Broadcasting (DAB); DAB to mobile, portable and fixed receivers (THIRD EDITION) EN V1.1.1: Digital Audio Broadcasting (DAB); Distribution interfaces; Service Transport Interface (STI) EN V1.1.1: Digital Audio Broadcasting (DAB); Distribution interfaces; Digital baseband In-phase and Quadrature (DIQ) Interface ETS : Digital Audio Broadcasting (DAB); Distribution interfaces; Ensemble Transport Interface (ETI) EN V1.2.1: Digital Audio Broadcasting (DAB); Multimedia Object Transfer (MOT) protocol EN V1.1.1: Digital Audio Broadcasting (DAB); Service Referencing from FM-RDS; Definition and use of RDS-ODA 5

6 DAB - Digital Audio Broadcasting Relevant Standards (ETSI/CENELEC/IEC): ES : Digital Audio Broadcasting (DAB); Internet Protocol Datagram Tunnelling ES V1.1.1: Digital Audio Broadcasting (DAB); Network Independent Protocols for Interactive Services ES V1.1.1: Digital Audio Broadcasting (DAB); DAB Interaction Channel through GSM / PSTN / ISDN / DECT EN 50255/ IEC 62105: Digital Audio Broadcasting system - Specification of the Receiver Data Interface (RDI) EN 50248/IEC 62104: Characteristics of DAB receivers EN 50320: The DAB Command Set for receivers 6

7 DAB - Digital Audio Broadcasting Block Diagram Transmitter 7

8 DAB - Digital Audio Broadcasting Block Diagram Transmitter 8

9 DAB - Digital Audio Broadcasting Transmission frequencies Band III E.g. f= 224,25 MHz = TV channel 12 Good area coverage L-Band F= MHz High costs local coverage Terrestrial network = Single frequency network Spectrum and power efficient technologies ETS (30 MHz 3 GHz) 9

10 DAB - Digital Audio Broadcasting Structure of the multiplex Three different transmission channels: 1. Synchronization channel Zero and phase reference symbol 2. FIC (Fast Information Channel) MCI Multiplex Configuration Information SI (Service Information) After analysis of the FIC the receiver can decode the payload Structured in FIBs (Fast Information Blocks) 3. MSC (Main Service Channel) Payload (programs and data services of the ensemble) Structured in Common Interleaved Frames (CIFs) Structuring of the CIFs in CU (Capacity Unit) 10

11 DAB - Digital Audio Broadcasting Transport mechanisms for data services Fast Information Data Channel (FIDC) Programme Associated Data (PAD) Packet Mode 11

12 DAB - Digital Audio Broadcasting Example Service Structure 12

13 DAB - Digital Audio Broadcasting Stream & Packet Mode Stream Mode Packet Mode Transmission of data streams Constant data rate: n*8kbit/s E.g. radio programs, audio coded with MPEG-1 Layer II Transmission of data streams With low data rates (<8kBit/s) or Temporal varying data rates Asynchronous data rates Pure data services 13

14 DAB - Digital Audio Broadcasting Multimedia Object Transport Protocol (MOT) Multiplex on segment layer using unique transport IDs Header Core Header Extension Object type and size Content Name Version Number Start Vaidity Expire Time further object parameters Transport of the information as objects of limited size (max. object size: approx. 255 MByte 14

15 DAB - Digital Audio Broadcasting Additional Services Traffic Message Channel (TCM) Data service based on Alert C protocol digital coded traffic message Reference of the numerically coded values to the information tables Event Location Severity Duration Alternative route Organisation of the numerically coded values in groups consisting of < 38 Bit of information Transport of the messages in the FIDC in FIGs 15

16 DAB - Digital Audio Broadcasting Additional Services Dynamic Label Displaying of short text messages on an alpha numerical display (labels) For the Transport: Segmentation of the labels in up to 8 segments with up to 18 characters, limited formatting possible Typical applications: Short messages Weather forecast Title / interpreter of a song Basic structure of a X-PAD data group: Prefix (2 Bytes) Character field (n Bytes) CRC (2 Bytes) 16

17 DAB - Digital Audio Broadcasting Block diagram receiver 17

18 DAB - Perspective Organization WorldDMB DAB+ HE-AAC (AAC+) MPEG Surround Digital Multimedia Broadcasting DMB Mobile reception (TV as well) T-DMB, S-DMB Interactive services possible 18

19 DVB - Digital Video Broadcasting Overview of the family of DVB Standards EN : Framing structure, channel coding and modulation for 11/12 GHz satellite services EN : Framing structure, channel coding and modulation forcable systems EN : Specification for Service Information (SI) in DVB systems EN : Specification for conveying ITU-R System B Teletext indvb bit streams EN : Satellite Master Antenna Television (SMATV) distribution systems ETS : Subtitling systems EN : Framing structure, channel coding and modulation fordigital terrestrial television EN : Multipoint Video Distribution Systems (MVDS) at 10GHz and above 19

20 DVB - Digital Video Broadcasting Overview of the family of DVB Standards EN : Interaction channel through the Digital Enhanced Cordless Telecommunications (DECT) EN : Interaction channel through the Global System for Mobile communications (GSM) EN : Interaction channel for Local Multipoint Distribution Systems (LMDS) EN : Framing structure, channel coding and modulation for Digital Satellite News Gathering (DSNG) and other contribution applications by satellite EN : Co-ordination channels associated with Digital Satellite News Gathering (DSNG) EN : OFDM modulation for microwave digital terrestrial television EN : Specification for the carriage of Vertical Blanking Information (VBI) data in DVB bitstreams 20

21 DVB - Digital Video Broadcasting What shall be provided: More channels using the same bandwidth Flexible selection of the audio and video quality Transmission of additional services Several subtitles Internet access Paid additional content Interaction via backchannel 21

22 DVB - Digital Video Broadcasting Combined Baseband Processing 22

23 DVB - S Overview Satellite Transmission Uplink in frequency multiplex Allocation of single frequencies to transponders Downlink in frequency multiplex Full scale amplification No amplitude modulation Uniform power distribution Sufficient bandwidth available Typical transponder bandwidth 27 MHz in the gigahertz range Quadrature Phase Shift Keying (QPSK) Satellites on different geo stationary positions can use the same frequency 23

24 DVB - S Overview of the transmitting end 24

25 DVB - C Overview Cable Transmission High SNR Relatively low bandwidth: Requirements: Channel spacing of TV n * 7 MHz VHF n * 8 MHz UHF Existing networks must be usable Compability to the satellite channel Decoder hardware preferably similar to the satellite decoder (QPSK = 4 QAM) 25

26 DVB - C Overview of the transmitting end 26

27 DVB - C Overview of the receiving end 27

28 DVB - T Overview Terrestrial Transmission Channel properties Requirements: Multipath propagation In house reception Coding similar to the satellite- and cable standard Transmission in 8 MHz bands (7Mhz and 6 MHz bands are possible as well) Possibility for Single Frequency Networks Good area coverage for roof antennas (mobile reception desierable but not mandatory) Orthogonal Frequency Devision Multiplex (OFDM) 28

29 DVB - T Overview of the transmitting end 29

30 DVB - Digital Video Broadcasting Comparison of the DVB- transmission systems 30

31 DVB - Digital Video Broadcasting Comparison of the DVB- transmission systems 31

32 DVB - Digital Video Broadcasting Payload MPEG bit stream PES Packetized elementary stream 32

33 DVB - Digital Video Broadcasting Program multiplex 33

34 DVB - Digital Video Broadcasting Service Hierarchy 34

35 DVB - Digital Video Broadcasting Additional Data / Program Content Description of the transport stream data Control of the receiver EPG (Electronic Service Guide) Table mapping via PID (Packet Identifier) Program Association Table (PAT) mapping of the PID to the corresponding programm Network Information Table (NIT) System specific information (e.g. network name) Event Information Table (EIT) Name of a broadcast, EPG Service Description Table (SDT) Description of single programs 35

36 DVB - X2 Modernization of all versions of DVB DVB-S2, -C2, -T2 Goals: More efficient usage of the channels (up to 30%) More stabil reception (HDTV) Approaches: More efficient modulation More efficient error correction mechanisms Modern codecs H.264 DVB-S2 already in use ETSI EN

37 DVB - X2 DVB, 1st Generation DVB-C, 1994, Cable ETSI EN DVB-S, 1995, Satellite ETSI EN DVB-T, 1995, Terrestrial ETSI EN DVB-H, 2004, Mobile/Terrestrial ETSI EN DVB-SH, 2007 Mobile/Satellite ETSI EN DVB-X2, 2nd Generation DVB-S2, 2005, Satellite ETSI EN DVB-T2, 2008, Terrestrial ETSI EN DVB-C2, 2009, Cable EN

38 DVB - X2 Forward Error Correction DVB, 1st Generation DVB-X2, 2nd Generation 38

39 DVB - X2 Type of modulation: DVB-C: single carrier 16QAM, 32QAM, 64QAM, 128QAM, 256QAM DVB-S: single carrier QPSK DVB-T: OFDM QPSK, 16QAM, 64QAM Type of modulation: DVB-C2: OFDM 16QAM, 32QAM, 64QAM,128QAM, 256QAM, 1024QAM, 4096QAM DVB-S2: single carrier QPSK, 8PSK, 16APSK, 32APSK DVB-T2: OFDM QPSK, 16QAM, 64QAM, 256QAM 39

40 DVB-S2 40

41 DVB-C2 41

42 DVB-C2 42

43 DVB-T2 43

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