Overview ISDB-T for sound broadcasting Terrestrial Digital Radio in Japan. Shunji NAKAHARA. NHK (Japan Broadcasting Corporation)

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1 Overview ISDB-T for sound broadcasting Terrestrial Digital Radio in Japan Shunji NAKAHARA NHK (Japan Broadcasting Corporation) 2003/11/04 1 Contents Features of ISDB-T SB system Current status of digital radio in Japan Examples of services 2003/11/04 2

2 Features of ISDB-T SB system Current status of digital radio in Japan Examples of services 2003/11/04 3 Features of ISDB-T SB Expectation for ISDB-T SB AM broadcasters:high quality audio services CD quality, stereo, no interference with by other AMs FM broadcasters multimedia services data services, still images,simple motion picture) Audience stable reception even in mobile reception, high quality audio, useful information news, weather forecast, traffic information, information related to current program) mobile reception portable reception 2003/11/04 4

3 Requirements for ISDB-T SB enable mobile / potable reception like AM,FM transmit high quality audio equivalent to CD provide data services information related to current program independent information ex. latest news, weather forecast, traffic information, so on Electronic Program Guide save frequencies no guard bands between adjacent broadcasters who transmit at a same site simplify allotment of channels for ISDB-T SB Single Frequency Networks Features of ISDB-T SB 2003/11/04 5 Elemental technologies of ISDB-T SB Features of ISDB-T SB technologies to realize requirements enable mobile / potable reception OFDM modulation scheme transmit high quality audio MPEG-2 AAC (Advanced Audio Coding) provide data services MPEG-2 Systems provide multimedia broadcasting save frequencies SFN band-segmented OFDM 2003/11/04 6

4 Modulated OFDM signals (Time and Frequency domains) Guard intervals I F F T Symbols F F T ts tg Time 1/ ts Frequency 2003/11/04 7 Transmission parameters of OFDM segment ISDB-T Mode Mode 1 Mode 2 Mode 3 Bandwidth 430kHz Carrier spacing 3.968kHz 1.984kHz 0.992kHz Total number of carriers Carrier modulation QPSK, 16QAM, 64QAM, DQPSK (OFDM) Number of symbols per frame 204 Useful symbol duration 252 µs 504 µs ms Guard Interval duration 1/4, 1/8, 1/16, 1/32 of useful symbol duration Frame duration ms ms ms Inner code Convolutional Code (1/2, 2/3, 3/4, 5/6, 7/8) Outer code RS (204,188) Interleaving frequency and time interleaving Length of time interleaving 0, 0.1, 0.2, 0.4, 0.8s Information rate 280kbps - 1.8Mbps 2003/11/04 8

5 Features of ISDB-T SB system Current status of digital radio in Japan Examples of services 2003/11/04 9 Current status of digital radio in Japan ISDB-T SB commenced in Japan started in Oct services as an independent new medium Analog AM and FM are continued Frequency : MHz (VHF ch.7) Bit Rate : 330kbps (=1 Segment) High quality sound MPEG-2AAC 144Kbps = CD Quality) Radio broadcaster can send still images and motion pictures Receiver presents Electronic Program Guide 2003/11/04 10

6 ISDB-T SB Receiver Current status of digital radio in Japan 2003/11/04 11 Features of ISDB-T SB system ISDB-T SB commenced in Japan Examples of services 2003/11/04 12

7 Examples of services on a program guide Time 7 8 News Music Kanto Area News Audio Classic Music (High Quality Sound Program) Tokyo News 144kbps Yokohama News Chiba News Program Related Data Text Title Player s Info etc. Local Event Info etc. Image Portrait Of Conductor etc. Poster etc. Examples of services Independent Data Text & Image Anytime News Text & Image Traffic Info EPG 9 Education English Listening English Conversation Basic English Business English Germany Chinese Arabic French Spanish Italian Russian Hankul 2003/11/04 13 Curriculum Text Book Picture of Book 36kbps 36kbps 36kbps 36kbps 64kbps 52kbps 70kbps Bit Rate Features of ISDB-T SB system ISDB-T SB commenced in Japan Examples of services 2003/11/04 14

8 Features of ISDB-T SB system uses OFDM scheme and MPEG2 AAC provides high quality audio and data services ISDB-T SB commenced in Japan Examples of services more details of ISDB-T BS are introduced in next session business, receivers,frequencies, and coverage 2003/11/04 15 Thank you for your attention. 2003/11/04 16

9 implementation issues ISDB-T for sound broadcasting Terrestrial Digital Radio in Japan Shunji NAKAHARA NHK (Japan Broadcasting Corporation) 2003/11/04 17 Contents Analog to Digital by ISDB Frequencies for Digital Radio in Japan Features of ISDB-T SB Structure of ISDB-T SB segments Digital radio project and broadcasters 2003/11/04 18

10 Analog to Digital by ISDB Frequencies for Digital Radio in Japan Features of ISDB-TSB Structure of ISDB-TSB segments Digital radio project and broadcasters 2003/11/04 19 Analog Media Media AM Radio FM Radio Terrestrial TV Satellite Cable Service began Num of Stations Num of Transmitters (satellites) Analog to Digital by ISDB Freq KHz MHz MHz GHz MHz (As of 2002) Rate of Penetration 99.9% 96.0% 99.4% 43.3% 19.3% 2003/11/04 20

11 Road Map to the Digital in Japan Analog to Digital by ISDB Media AM Radio FM Radio Terrestrial TV Digital begins As a New Media Analog ends Remain Service Audio Text Still Images Motion Pictures Motion Pictures ISDB ISDB-T SB ISDB-T Satellite TV Cable TV Hi-Vision 5.1 Surround Text Still Images ISDB-S ISDB-C 2003/11/04 21 Analog to Digital by ISDB Frequencies for Digital Radio in Japan Features of ISDB-TSB Structure of ISDB-TSB segments Digital radio project and broadcasters 2003/11/04 22

12 Frequencies for terrestrial broadcastings in Japan 700 Frequencies for Digital Radio in Japan Sites and numbers of existing Analog TV stations Digital Radio introduced in VHF Digital TV introduced in UHF red dots analog TV transmitters sites Number of stations Existing Analog TV Stations Channels approx. 15,000 Stations approx. 3, VHF channel number UHF 2003/11/04 23 Frequencies for terrestrial broadcastings in Japan Assignment from 2003 to the year 2011 Frequencies for Digital Radio in Japan AM radio FM radio Analog television and Digital radio VHF Digital television and Analog television UHF 531~1602kHz 76~90MHz 90~108MHz 170 ~ 222MHz 470MHz ~ 770MHz ch ch MHz 188MHz channel 7 192MHz 194MHz 198MHz channel 8 Frequencies for terrestrial digital radio 2003/11/04 24

13 Frequencies for Digital Radio in Japan Frequencies for terrestrial broadcastings in Japan Assignment from 2003 to the year 2011 AM radio FM radio Analog television and Digital radio VHF Digital television and Analog television UHF 531~1602kHz 76~90MHz 90~108MHz 170 ~ 222MHz 470MHz ~ 770MHz ch ch Assignment after the year 2011 AM radio FM radio Digital radio / (mobile communications) VHF Digital television UHF 531~1602kHz 76~90MHz 90~108MHz 170 ~ 222MHz 470MHz ~ 710MHz ch ch /11/ Analog to Digital by ISDB Frequencies for Digital Radio in Japan Features of ISDB-TSB Structure of ISDB-TSB segments Digital radio project and broadcasters 2003/11/04 26

14 Significant features of ISDB-T SB (1) ISDB-T SB is named digital system F in Recommendation ITU-R BS Source coding MPEG-2 AAC (Advanced Audio Coding) international standard : ISO/IEC AAC coding of 144kbps can bring High-quality and efficient sound broadcasting Multiplexing MPEG-2 Systems international standard : ISO/IEC provide multimedia broadcasting ISDB-T SB has compatibility with many digital systems through MPEG-2 transport stream Transmission (next slide) 2003/11/04 27 Features of ISDB-T SB Features of ISDB-T SB Significant features of ISDB-T SB (2) Transmission scheme Common system both television and sound broadcasting rugged system which uses OFDM modulation scheme (band segmented OFDM) two-dimensional frequency-time interleaving Convolutional code + Reed-Solomon code realize high reliability to make Mobile and portable reception possible capable to transmit information bit rates of 330kbps per segment save frequencies because of SFN (Single Frequency Network) and a connected transmission scheme 2003/11/04 28

15 Features of ISDB-T SB Maximum speed depending on Mode Maximum speed (km/h) Mode1 (2k) Mode2 (4k) VHF (200MHz) UHF (770MHz) Mode3 (8k) The Number of carriers (FFT size) 2003/11/04 29 Analog to Digital by ISDB Frequencies for Digital Radio in Japan Features of ISDB-TSB Structure of ISDB-TSB segments Digital radio project and broadcasters 2003/11/04 30

16 Format of Digital Terrestrial Audio and Example of Services Audio and Data Broadcasting Examples of format Basic ( 1 Segment) 330 kbps High Quality Sound Data CTL Ex.1 Stereo Text Image Signal 144 kbps 100kbps Mono Mono Data CTL Ex.2 Audio Audio Text Image Motion Pic Signal 24kbps 24kbps 200 kbps Data Broadcasting at the other Media Satellite Digital Broadcasting 2000kbps fixed Terrestrial Analog TELETEXT 40kbps fixed character multiplex broadcast 7kbps mobile ISDN 64kbps fixed IMT kbps mobile Extension ( Segment) 3 Ex.3 Ex.4 High Quality Sound Stereo 990 kbps Data Text Image Motion Pictures,etc. 144 kbps 700 kbps High Quality SoundHigh Quality Sound Stereo Stereo 144 kbps 144 kbps Data Text Image Motion Pictures, etc. 550 kbps CTL Signal CTL Signal 2003/11/04 31 Examples of services on a program guide Time 7 8 News Music Kanto Area News Audio Classic Music (High Quality Sound Program) Tokyo News 144kbps Yokohama News Chiba News Program Related Data Text Title Player s Info etc. Local Event Info etc. Image Portrait Of Conductor etc. Poster etc. Independent Data Text & Image Anytime News Text & Image Traffic Info EPG 9 Education English Listening English Conversation Basic English Business English Germany Chinese Arabic French Spanish Italian Russian Hankul 2003/11/04 32 Curriculum Text Book Picture of Book 36kbps 36kbps 36kbps 36kbps 64kbps 52kbps 70kbps Bit Rate

17 Examples of services on a program guide Time Audio Program Related Data Independent Data Text& Image Text& Image 10 Music audio (L) audio (R) Foot ball game (Simple Motion Picture) Approx. 128kbps MPEG4?, H.264? Traffic Info EPG 11 Education English Listening English Conversation Basic English Business English Germany Chinese Arabic French Spanish Italian Russian Hankul Front Page Of Text Book? Curri- Culum Text Book Bit Rate 2003/11/04 33 Digital Radio Receiver (1) Still Image latest News (e.g. Station Logo) Segment Number Program Related Information 2003/11/04 34

18 Digital Radio Receiver (2) Anytime News (Text and image) Traffic Information Anytime News (Voice) 2003/11/04 35 Analog to Digital by ISDB Frequencies for Digital Radio in Japan Features of ISDB-TSB Structure of ISDB-TSB segments Digital radio project and broadcasters 2003/11/04 36

19 Structure of ISDB-T SB segments Segmented OFDM transmission OFDM-Segment OFDM spectrum Frequency 2003/11/04 37 Connected transmission Structure of ISDB-T SB segments Connected transmission Synchronize transmission No guard-band Non-connected transmission Non-synchronize transmission Guard-band needed 430kHz Multi-one-segment transmission 430kHz 1.3MHz 430kHz 430kHz 1.3MHz 2003/11/04 38

20 Connected transmission Structure of ISDB-T SB segments connected segments between ch.7 and 8 at present one segment has a band width of 430 khz #1 #2 #3 #4 #5 #6 #7 #8 one segment frequency 4MHz connected segments in a TV channel after 2011 #1 #2 #3 #4 #5 #6 # #8 #9 #10 #11 #12 frequency 6MHz band width for one TV channel 2003/11/04 39 Analog to Digital by ISDB Frequencies for Digital Radio in Japan Features of ISDB-TSB Structure of ISDB-TSB segments Digital radio project and broadcasters 2003/11/04 40

21 Digital radio project and broadcasters Digital radio project and broadcasters in Japan (1) Digital Radio Promotion Association (DRP) was organized as a consortium constructed by 32 broadcasters as below Tokyo metropolitan area #1 #2 #3 #4 existing AM, FM broadcasters #5 #6,7,8 (use 3ses) NHK VICS OSAKA metropolitan area #1 NHK VICS FM J-WAVE TBS R&C BAY FM SONY SONY communicatio ns network #2 M B S #3 A B C FM #4 #5 #6 #7 #8 Fm osaka FM AM KBS 2003/11/04 41 Digital radio project and broadcasters Digital radio project and broadcasters in Japan (2) Each group of broadcasters send MPEG2 transport streams (TS) to DRP DRP as a consortium re-multiplexes TS and modulates to an OFDM signal The OFDM signal is connected by 8 or 12 segments, and transmitted Receivers then tune into a segment to enjoy the programs broadcasters A broadcasters B broadcasters C Digital Radio Transport streams Promotion for 1 or 3 segment(s) Association (DRP) Re-multiplexing OFDM Modulation transmit ISDB-T SB signal A B C D Freq. connected 8 segments(4mhz) or 12 segments(6mhz) 2003/11/04 42

22 Digital radio project and broadcasters License for Digital Radio in Japan licensed party Digital Radio Promotion Association (DRP) Station Tokyo station Osaka station Start Center frequency October 10th MHz (in channel 7) transmit power Power/ segment transmit site 800 W (100 W) Tokyo tower 240 W (30 W) Mount ikoma Coverage are Tokyo metropolitan area Osaka metropolitan area 2003/11/04 43 Coverage Transmitting tower Tokyo Tower 2003/11/04 44

23 Coverage Coverage over Tokyo metropolitan area Japan Island Tokyo Coverage for mobile reception :field strength of 57dBµV/m (16QAM,coding rate ½) Coverage for mobile reception :field strength of 51dBµV/m (QPSK,coding rate ½) 50 km Coverage for mobile reception :field strength of 39dBµV/m (QPSK,coding rate ½) 2003/11/04 45 Coverage over Osaka metropolitan area Japan Island Coverage Osaka Coverage for mobile reception :field strength of 57dBµV/m (16QAM,coding rate ½) Coverage for mobile reception :field strength of 51dBµV/m (QPSK,coding rate ½) Coverage for mobile reception :field strength of 39dBµV/m (QPSK,coding rate ½) 50 km 2003/11/04 46

24 Analog to Digital by ISDB Frequencies for Digital Radio in Japan Features of ISDB-TSB Structure of ISDB-TSB segments Digital radio project and broadcasters 2003/11/04 47 Digital radio business in Japan DRP as a consortium started digital radio business Oct.10th this year Digital radio system use ISDB-T for sound broadcasting system provide high quality audio and data services 2003/11/04 48

25 Thank you for your attention. 2003/11/04 49

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