2010 협업환경및가시화기술워크숍 November 10th, 2010 @ Gwangju Institute of Science and Technology Boncheol Goo KAIST Graduate School of Culture Technology
Contents 1. Networked Event System Configuration 2. A/V Transmission System 3. ADDA Converter 4. Echo Cancellation 2 / 23
1. Networked Event System Configuration VW Performing Arts AR / MR Multi Home Business University Institute Digital Heritage Video Mobile Terminal Domestic Network Tx/Rx Archive System Audio LIVE Access HW / SW Network Foreign Network High-speed Network Research Group Contents Global Partners 3 / 23
2. A/V Transmission System a. i-visto (NTT) to ingest, edit, and play out high-quality video through an IP network i-visto XMS (Broadcasting Station) i-visto gateway (Video-transmission System) IP transmission : bidirectional, real-time Audio : embedded audio (HD-SDI, SD-SDI) Video : HD-SDI, SD-SDI, DVB-ASI Connector : BNC Bandwidth : HD-SDI - 1.6Gbps (800Mbps*2) 4 / 23
2. A/V Transmission System b. TVG 430/450 (T-VIPS) for real-time contribution and distribution of broadcast quality video over IP networks with up to 1 3G-SDI, 2 HD-SDI or 4 SDI channels in the same unit (TVG450) IP transmission : 2x RJ45 100/1000Base-T, real-time Audio : embedded audio (Uncompressed, 16 channels, 24 bit) Video : 3G/HD-SDI/SDI Connector : BNC IP Bitrate : 25 to 450 Mbit/s 5 / 23
2. A/V Transmission System c. imcast (developing by KISTI/GIST) Network http://good.kreonet.net/monet/doku.php?id=monet:uncompressed_hdtv:uchd 6 / 23
2. A/V Transmission System d. IOCOM Grid (IOCOM) multi-point collaboration platform Video Codec 7 / 23
2. A/V Transmission System e. DVTS / VLC http://www.sfc.wide.ad.jp/dvts/ http://www.videolan.org/vlc/ 8 / 23
3. ADDA Converter a. Embedded Audio (AES) XLR HD-SDI BNC Analog to Digital Optical to AES Tx IP FW610 LA Audio AES-SDP HD10AM Embedded Audio HDP Rx IP DVI 9 / 23
3. ADDA Converter b. Digital Audio Streaming * AES/EBU(AES3) - 최대 100m 까지전송 - 110Ω의실드된 single twisted-pair cable과 3-pin XLR 커넥터사용 - 75Ω 동축케이블과 BNC 커넥터를사용하여약 1km까지장거리전송 - 데이터와함께워드클럭신호정보전송 - 32kHz, 44.1kHz, 48kHz가상용되고, 양자화비트수는최대 24bit까지대응 - 2채널이상은복수의케이블사용 * S/P DIF - AES/EBU와차이가없으며전문가용에비해서일반소비자용임 - Coaxial 방식에는 75Ω 동축케이블과 RCA 커넥터사용 - Optical 방식에는전용케이블사용하며전송거리는최대 10m 정도임 * 기타포맷 - SDIF-2, ADAT, TDIF, MADI, Ethernet, Firewire, USB 10 / 23
3. ADDA Converter c. Transmission Speed Format Bandwidth Max. Audio Channels USB 1.1 12 Mb/s 3 (theoretical limit) USB 2.0 480 Mb/s 80 (per end point) FireWire 400 400 Mb/s 85 (theoretical limit) FireWire 800 800 Mb/s 170 (theoretical limit) 100BaseT Ethernet 100 Mb/s 32 (typical) Gigabit Ethernet 1 Gb/s 320 (typical) Legacy PCI 1 Gb/s Up to 100 (typical) PCI Express (PCI-E)x1 2.5 Gb/s 800 (theoretical limit) 11 / 23
3. ADDA Converter d. Audio File Format * ADAT - 8트랙의디지털오디오데이터를 S-VHS 테이프에기록 - 테이프속도는 VCR의 3배이므로 120분용 S-VHS 테이프에 40분정도녹음 - 사용전에테이프에타임코드를기록하기위해포맷을해야함 * TASCAM - Hi-8 비디오테이프에기록하며 120분용카세트에 108분녹음가능 - DTRS 포맷 (8트랙) 에서는 24bit로녹음 * WAV - PC 표준오디오포맷으로.wav의확장명으로하드디스크에저장 * AIFF - 애플사가개발한포맷으로 PC에서는.aif의확장명을붙여사용 * MPEG - MPEG-1은 32, 44.1, 48kHz의모노또는 2채널신호를대상으로함 - MPEG-2는 5.1 서라운드에대응하며, 미국에서는 AC-3 압축포맷채용 12 / 23
4. Echo Cancellation a. 에코의발생과제거 에코는자신이말한소리가다시들리는현상으로원음과에코사이의시간차가크면대화에방해가되며에코제거의기본개념은레퍼런스 (Reference) 입력을분석하여되돌아오는소리에서원래의신호를제거하는것임 13 / 23
4. Echo Cancellation b. Echo Canceller 의기능 14 / 23
4. Echo Cancellation c. XAP 400/800 (ClearOne) XAP 400/800 은에코제거기, 노이즈제거기, 오디오프로세싱기능으로구성된 12 X 12 오디오매트릭스스위처역할을하는에코캔슬장비로각종미디어장비의통합적컨트롤이가능함 G-Wire 15 / 23
4. Echo Cancellation d. EchoDamp (developed by USC) EchoDamp 는 USC(University of Southern California) 에서개발한소프트웨어로음악용멀티채널오디오믹서및에코캔슬러로디자인됨 Echo Damp - Performs multi-channel audio mixing - Creates separate mixes for performers, control room, and audience members - Controls both incoming and outgoing echo - Maintains full audio frequency spectrum - Calibrates audio levels between sites - Calculates round-trip latency between sites - Reduces rumble and low-frequency noise - Runs on Macintosh and Windows computers - Works with numerous hardware audio interfaces 16 / 23
4. Echo Cancellation e. Microphone & Speaker 17 / 23
4. Echo Cancellation f. DVTS & EchoDamp Network Far End VTC 1394 전면 후면 Sound Card Out Out 3/4 In 3/4 Out 1/2 Mic In ( 단, 메뉴에서수동으로설정 ) 18 / 23
4. Echo Cancellation g. Digital Mixer B 장소 에코캔슬러 에코제거 레퍼런스 A 장소 에코제거상태테스트음향 11-12 9-10 7-8 버스 1-2 3-4 5-6 7-8 입력 1~6 디지털믹서 / 버스출력 8 채널 19 / 23
I-M-Age @ IDMAA 2010 Conference in Vancouver by B. Goo IOCOM Interactive Video using Jitter Infrared Camera Interactive Video using Jitter IOCOM HDV HDV Frequency Detecting (p,q) Max5 Image Processing Movement Tracking (x, y) Max5 Echo Cancel IOCOM IP-1 IP-3 IP-2 KREONET IP-3 IP-2 IP-1 IOCOM HDV Korea Side ichat ichat Canada Side
Expander 설정 to prevent audio coming from the remote site through the loudspeakers being retransmitted back to the remote site 입력레벨이 -30dB 이상올라가면 0.10ms 내로 Expander 가작동하지않음, 즉입력을그대로출력함 입력레벨이 -50dB 이하로떨어지면볼륨을 1:10 으로떨어뜨림, 즉 -50dB 아래로들어오는입력 1db 마다출력은 10dB 감소함 단, 입력이 -50db 이하로떨어져도 500ms 동안은출력을떨어뜨리지않다가 500ms 이상지속되면 150ms 에걸쳐서서히 1:10 으로감소시킴 21 / 23
Ducker 설정 to prevent your own sound from echoing back to you by automatically lowering the level of the incoming codec audio when your performers talk, play, or sing 2-Chaanel Ducker 는마이크입력채널의 SideChain 과함께작동함, 즉 SideChain Delay 에서설정한시간후에 Far End 에서자신의에코가돌아오면작동함 SideChain 입력이 -46dB 이상이면 20ms 후에 8dB 범위에서스피커출력이감소되고, 이하이면그대로출력됨 단, -46dB 이하로내려가면 250ms 에걸쳐서서히복구됨 22 / 23
Thank you for your attention GLORIAD Map 2010 http://www.gloriad.org 23 / 23