TV Asahi. Japan s Experiences for Digital Terrestrial TV Broadcasting part-1 Studio perspective

Transcription

1 Japan s Experiences for Digital Terrestrial TV Broadcasting part-1 Studio perspective SET 2007 Congresso Aug. 24 th,2007 DiBEG Japan Yoshiki MARUYAMA TV Asahi Digital Broadcasting Expert Group

2 Contents Implementation of digital television studio Master control system Contents distribution center Audio production STL Digital television broadcasting optical fiber network 2

3 Implementation of Digital television studio 3

4 Migration Plan Schedule for Digitalization of Broadcasting in Japan Planning of DTTB station channels was started Technical Standards for DTTB were established TV Asahi new building were completed TV Asahi new building constructions were started DTTB started in three metropolitan areas Termination of Analog broadcasting July 24,

5 Shifted to the new site TV Asahi s s Head Quarter was shifted to new site of Roppongi hills from Ark Hills premise on Mar to secure the space of new digital broadcasting facilities and to commence digital terrestrial broadcasting on Dec. 1 st, Mar31 st.2003 Roppongi Hills moved Ark Hills 5

6 Construction of the new building Building Outline Construction period: Aug.1 st 2000 Mar.31 st 2003 Building Area: 9,469.74m 2 Number of Stories: eight stories above the ground and three underground stories. Total Floor Area: 73,700.43m 2 Power Supply: 66kV Loop Substation Private Power Generator: Gas Turbine PG. 3,500kVA 6.6kVx2 UPS: 1000KVAx2 Redundant operation Construction progress 6

7 New building TV Asahi has installed full digital broadcasting systems for Analogue & Digital terrestrial television broadcasting at new building. Studio 3 Studio 4 Master Master Studio 1 Studio 2 Cross-section section view 7

8 New building Plan view 2nd floor 8

9 Technical designd concept 1.Full HD-SDI & Full digital system in house 2.System phase management 3.One source-multi use 9

10 Digital signal interface 1. Digital HD HD-SDI (1080i) BTA S-004B S (SMPTE-292M) Component serial digital 1080i/59.94Hz 2. Digital SD SMPTE-259M (270Mbps) Component serial digital 3.Embeded audio SMPTE-299M 8ch:equivalent of AES/EBU 4pair/Fs48kHz/24bit 10

11 System phase delay management 1 1. HD signal is primary used in the house. 2. In the house, the signal from the distribution center is the least and the signal from the studio is the most delayed. Because the studio equipments such as switcher, MK/ DSK, color corrector generate e latency. 3. To maintain seam-less switching at the studio, input signal to switcher should be no phase delay difference. 4.AVDL (Automatic video delay line ) is the device to cancel the phase differences automatically. 11

12 System phase delay management 2 Satellite & Distribution Center Reference at distribution center AVDL is to eliminate phase differences within 25μ News Sub CG Edit CC 10μ SW MK DSK (2.5H) 2.5H+ 10μ FS Master Reference at Master N1 FS FS M T X Room VT CC 10μ SVC FS DSK 25 μ 35 μ CC CC 10μ Production Sub CC SW MK DSK (2.5H) 2.5H+ 10μ SW CG room Edit room ±0H Differential delay 4H +35u=1H+5u 1H+15u=1.5H +1.5H+2.5H=4H +4H CC: Color corrector 1H:29.65uSec 12

13 Master system 13

14 Requirements of Master System Multi format solution rate-free matrix 1080i/720p/480p/480i Multi channel solution up to three SD programs High reliability three redundant system current/backup/test or maintenance High flexibility Easy expansion and renovation Effective use of servers CM server/program server/cg server 14

15 Required applications Segments: 12 Segment: 1 Time 8:00 9:00 10:00 SDTV1 MPEG2 MP@ML Supplemental broadcast HDTV MPEG2 MP@HL SDTV2 MPEG2 MP@ML Supplemental broadcast SDTV3 MPEG2 MP@ML Supplemental broadcast Supplemental broadcast H.264 BP@L1.2 One-Seg service Supplemental broadcast 1 segment service for mobile phone 15

16 Conceptual diagram of Master Carry-in Guideline VTR format: D2/HDCAM/HDCAM- SR/digitalβcam/HD- D5 are acceptable. Program Server: Pinnacle systems MSS900 HD 120H or SD 300H Raid 3 CM Srever: Sony MAV-2000 HDx1 72H SDx1 90H M-Raid 6 VAF system: Toshiba VIDEOS Flush memory Still picture 3600 frame.tif format Motion 30min Audio 8H.wav format Audio format: MIC/CD/DAT/MO/6mm 16

17 Conceptual diagram EDPS (management of business & broadcasting data processing system) manages program and CM material data. Dominant CPU LAN DS: Editing for Data APS: Real time control 17

18 Conceptual diagram Master system 18

19 Conceptual diagram Portion of input Video and Audio for PV[HD/SD] V T R Recorded contents[hd/sd] Recorded contents[hd] Program Server Portion of Server Portion of APC OA contents[hd] CG CG contents Portion of Video file Contents for PV[HD] Audio contents for PV OA contents[sd] OA contents[hd] Announce booth or audio equipment V T R Audio contents VAF Portion of Audio file OA audio contents(embedded with HD-BB) CM Server [SD] D/C [HD] [SD] D/C OA contents[hd] OA contents[sd] D D A Assemble Switcher ( ) Network contents Distribution Center OA contents[hd/sd] Studios (1st~65st) OA contents[hd] other contents[hd/sd] Breaking news OA contents[hd] 19

20 Conceptual diagram Portion of assembling 20

21 Conceptual diagram CM Server Play list Play list 21

22 Three redundant system Provision of test environment is essential in the age of digital. Seamless system changer Current use Back up use Test bed 22

23 HD/SD switching failure TV Asahi s s master system conforms with ARIB STD B21 Receiver for digital broadcasting, appendix 1 the 1 method of switching the video format. Therefore, seamless switching is assured even HD to SD or from SD to HD program. However, unfortunately it is true that seamless-switching switching-incapable incapable receivers are in the marketplace. To prevent video failure for the non-standard receivers, TV Asahi provides Guideline of carrying in contents. 23

24 HD/SD switching failure TV Asahi s s guideline of carrying in contents: to prevent switching video failure. 10 second bumper such as no value picture is required to be inserted between SD and HD program. HD Failure SD 10 Sec HD Bumper SD 24

25 APS (Automatic program control system) Feature Assembling and delivery Rate-free matrix for assembling Format conversion with D/C, U/C Aspect conversion with A/C Embedded audio processing Caption broadcasting Data broadcasting 25

26 Encoder, MUX - HD encoder (MPEG2 : MP@HL) - SD encoder (MPEG2 : MP@ML) - 1-SEG encoder (H.264:BP@L1.2) - MUX complaints with ARIB STD-B31 26

27 Aspect ratio converter 1 Example of aspect converting Input format Format Aspect ratio Sample picture HD 1080i Output format Analog no designation designation HD 16:9 No operation D/C letter box D/C side cut D/C side cut No 4:3 operation no request SD 4:3 16:9 U/C side panel U/C vertical clearance No operation No operation no request no request 27

28 Aspect ratio converter 2 HD 16:9 SD 4:3 Squeeze U/C SD 4:3 U/C Master HD 16:9 D/C SD 4:3 SD 4:3 A/C Master HD 16:9 D/C SD 4:3 SD 4:3 Squeeze A/C Master 28

29 Re-entry entry switcher To eliminate the pre-switcher, TV Asahi introduced re-entry entry switcher. Re-entry entry is effective for compact size of system. Studio HD In the case of D/C D/C Analog broadcasting Digital HD broadcasting Digital SD broadcasting Assembling switcher 256x128 29

30 Test environment is essential factor Necessity of redundant system and test environment In the digital broadcasting age, test environment is essential factor. Because in contrast with analog signal performance, TS signal performance is quite difficult to determine the reason of sudden failure. Therefore redundant system is essential, in the case of sudden failure, system change from current to back up is single correct answer. Furthermore, system 3 is utilized as test bed for verification of o event ignition time. 30

31 TS monitoring and recording system HDD-Raid for 3days full TS recording Monitor-1 SYS-1 TS F-SW out TS recorder MTM400 from monitoring point MTX SW MTM-400 Tektronix SYS-1 TS MTM-400 Tektronix SYS-2 TS Ethernet RTX-100 Tektronix Monitor-1 TV monitor MTM-400 Tektronix Manual SW RTX-100 Tektronix TV monitor TS monitor from monitoring decorder SW HUB Tthumbnail generating PC Alarm management PC 31

32 SI/EPG system SI: Service Information Various information designed to improve the convenience of program selection, specified by the ARIB standard. BIT, SDT, EIT, CDT and SDTT are generated and sent. ES : Engineering Service SDTT : Software Download Trigger Table 32

33 Contents distribution center 33

34 Design concept Centralized information management with any PC terminals. Realization of multitasking, such as coordinating of SNG, coordinating of FPU, booking for NTT lines, any other business. Comfortable environment for 24 Hours duties. Only embedded audio contents are acceptable by MTX. 34

35 Layout of working area 35

36 Conceptual diagram Information management system 36

37 Conceptual diagram Distribution system 37

38 Conceptual diagram Control system network TV Asahi side Controlled side Ethernet (100BASE-TX) Operation CPU Ethernet (100BASE-TX) for Receiving sight NW CPU MUX modem for Receiving sight NW CPU Rooter STL/TSL High speed leased line 128kbps Receiving sight MUX modem Receiving sight Rooter controled terminal controled terminal controled terminal controled terminal controled terminal FPU ANT platform FPU ANT platform FPU ANT platform Camera cont FPU cont System for other business Monitor cont terminal 1-5 SNG system SNG I/F CPU for Receiving sight NW CPU Full-duplex modem for Bureau NTT 4W leased line Receiving sight Full-duplex modem Bureau controled terminal FPU ANT platform IP transmission eqipment Information camera cont system Information camera I/F CPU ENG I/F CPU Full-duplex modem NTT public Network IP transmission eqipment Communication line cont system GPS GPS data decoder GPS modem PBX I/F CPU GPS I/F CPU NW CPU Tone generator VHF/UHF/TEL Live broadcasting sight 38

39 Audio production 39

40 Audio production concept Audio signal in house is HD-SDI, Fs 48kHz/24bit 8ch embedded, equivalent to AES/EBU 4ch. Audio signal is transferred to every studios via delivery center. All studio audio mixers are acceptable 5.1ch surround audio, that means all studios are equipped 8ch surround monitors. 40

41 5.1ch/stereo switching audio failure At the moment, audio switching takes 210msec of failure duration from stereo program to 5.1ch program or from 5.1ch program to stereo program. To prevent the switching failure, master insert mute signal for 200 msec, in addition TV Asahi established Guideline of carrying in contents in order to incapable receivers. Guidelines require the duration of no sound area at the start and end of broadcasting contents. Mute 100msec 100msec 500msec Duration of no sound at the start Audio 5.1ch surround Audio 2ch stereo 500msec Duration of no sound at the end 0 41

42 STL TV Asahi Tokyo Tower 42

43 Microwave For transmitting the television program from studio to transmission site, a transport stream studio-to to- transmitter link (TS-STL) STL) is primary used. TS method is 64QAM modulated by ISDB-T T format broadcasting TS signal. This method gains the performance of less signal degradation. Transmitter power Frequency deviation Occupied bandwidth Modulation method Transmission rate 0.5W/1W/2W within ±20ppm below 7.6MHz 64QAM below 40.2Mbps 43

44 Optical cable STL via optical cable Optical transmitter is available to transmit OFDM signal from studio to transmitter site via optical cable MHz Bandwidth. QAM, PSK or OFDM signal transmission is available. Long haul transmission - Optical loss budget is 25dB. Fully manageable through Simple Network Management Protocol (SNMP). Having console port for setup and monitoring parameters. Web-GUI inside- Setup and monitoring parameters from usual Web-browser. 44

45 Requirement of SFN relay station To implement SFN relay station, following requirement must be met in order to establish synchronism between station-to to- station. IFFT sample frequency should be synchronized with the studio and the broadcasting station,or among the broadcasting stations. Synchronized methods are as follows; 1. Slave synchronization The clock of modulator in each transmitter is synchronized to the clock of MUX in studio. 2. Reference synchronization This method synchronizes the studio and all the broadcasting stations by GPS other than the terrestrial digital broadcast 45 wave.

46 Synchronized methods 46

47 Digital television broadcasting optical fiber network 47

48 Digital television broadcasting network The National Association of Commercial Broadcasters in Japan (NAB) is an incorporated organization whose membership consists of commercial broadcasters in Japan. To establish the infrastructure of the relay service from key station to affiliated network stations, NAB has nominated NTT communications (NTT Com) as main carrier in NTT showed us the solution of 17Gbps backbone ATM network. 48

49 Digital television broadcasting network On Air On Air On Air On Air 49

50 Commercial broadcast requirement Base band transmission: Commercial broadcasts Non-Compressed HD-SDI less delay network running cost High easy production Broadcast TS transmission: NHK Broadcast TS much delay network running cost Low 50

51 Service menu HD non-compressed HD-SDI 1.483Gbps Audio signal is embedded : Fs 48kHz/24bit max 8ch, equivalent to AES/EBU 4ch SD non-compressed SD-SDI SDI 425Mbps Audio signal is embedded : Fs 48kHz/24bit max 8ch, equivalent to AES/EBU 4ch HD compressed HD-SDI 151Mbps Audio signal is embedded : Fs 48kHz/24bit max 8ch, equivalent to AES/EBU 4ch NTSC non-compressed (analog) 143Mbps NTSC compressed 61Mbps DVB-ASI 120Mbps DVB-ASI for data broadcasting 8Mbps 51

52 NTT Com service Outline of NTT Com service Access line 52

53 Access line 53

54 Accommodation concept Non-compress HD 1.7Gbps 2.4Gbps line Non-compress SD 425Mbps DVB-ASI 10Mbps HD SD 1 SD 3 SD 2 SDx3ch 54

55 SET 2007 congresso Thank you for your attention! END Digital Broadcasting Expert Group mail: 55