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SOI Asia Realtime class
Shoko Mikawa (funya)[email protected] SOI Asia E-Global Operators Workshop 2006 Summer August 22nd – 26th, 2006
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Realtime Class Components
Lecture Video & Audio PowerPoint synchronization Staff Communication
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Lecture Video & AudioGateway Site at SFC
UDL Link
AI3 Network
Partnet#1 Partner#2
P2 A/V stream
Lecturer Site
Lecturer A/V stream
P1 A/V stream
Lecturer A/V stream
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Gateway Site at SFC
UDL Link
AI3 Network
Partnet#1 Partner#2
Lecturer Site
PPT Slide Number
PowerPoint SynchronizationPPT
PPT PPT
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Staff CommunicationGateway Site at SFC
UDL Link
AI3 Network
Partnet#1 Partner#2
Lecturer Site
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Classroom Example
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Realtime class system
(1) Video/Audio System(2) PPT Synchronization(3) Staff communication
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2 realtime applications
VIC/RAT– Receive lecture stream– Send classroom stream– Interactive session – Multi-parties, many senders and many receivers
Window Media– Receive lecture stream only– Non-interactive session– One sender and many receivers
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Realtime Class (VIC/RAT)Gateway Site at SFC
UDL Link
AI3 Network
Partnet#1 Partner#2
Lecturer Site
Lecturer A/V stream
P1 A/V stream
Lecturer A/V stream
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VIC/RAT
VIC for send/receive Video RAT for send/receive Audio
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VIC/RAT model
Peer to Peer relationship Every node is equal Every node can receive/send to same
multicast address
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VIC/RAT
Multicast
Channel
VIC/RATmachine
VIC/RATmachine
VIC/RATmachine
VIC/RATmachine
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Real time class (Windows Media)Gateway Site at SFC
UDL Link
AI3 Network
Partnet#1 Partner#2
Lecturer Site
Lecturer A/V stream
Lecturer A/V stream
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Window Media model
Sender-receiver relationship Sender sends to one multicast address
(but not receive) Receiver joins to that multicast address
(but not send)
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Window Media
Window media sender at Japan Partners can receive only
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Window media
Window media players
Window media sender
Multicast Channel
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Video/Audio Lab work
STEP1 : IPv6 Installation & Firewall Disable From ow-realtimeclass_lab.pdf,
do STEP 1 Windows XP SP1 or higher 10 min.
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Video/Audio Lab work
STEP2 : VIC/RAT installation From ow-realtimeclass_lab.pdf,
do STEP 2 Install/Receive VIC/RAT with your PC TA demonstrates to send VIC/RAT
– Your PC doesn’t have Camera 25 min.
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VIC
All parties send/receive to same multicast address/port
SOI Asia VIC address/port– IPv4 233.18.109.3 port 6666– IPv6 ff38:20:2001:d30:101:2:1:3 port 3333
Application specifies port– #vic 233.18.109.3/6666– #vic ff38:20:2001:d30:101:2:1:3/3333
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RAT
All parties send/receive to same multicast address/port
SOI Asia RAT address/port– IPv4 233.18.109.7 port 7777– IPv6 ff38:20:2001:d30:101:2:1:4 port 4444
Application specifies port– #rat 233.18.109.4/7777– #rat ff38:20:2001:d30:101:2:1:4/4444
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Video/Audio Lab work
STEP3 : WMP installation From ow-realtimeclass_lab.pdf,
do STEP 3 Install/Receive WMP with your PC 15 mins
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Window Media
Sender sends to a multicast address Sender generates announcement
files(.asx,.nsc) contains multicast information
Client machine downloads that (.asx,.nsc) files to machine
Use window media player to open .asx Window media player will join stream
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Window media announcement file
http://www.soi.wide.ad.jp/soi-asia/wmt/
1. IPv6 Test Program 2. IPv6 Realtime Lecture Stream3. IPv4 Test Program4. IPv4 Realtime Lecture Stream
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Realtime class system
(1) Video/Audio System(2) PPT Synchronization(3) Staff communication
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IRC (Internet Relay Chat)
IRC server
Connect to serverSpecify talk channel
# soi-asia channel # sport
channel
Chatting
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Real time class : IRC
AI3 network
Partner#1 Partner#2
IRC serverStaff machine
Staff machineStaff machine
SFC lecture studio
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Step 4: mIRC
TA will show you the demonstration
Install MIRC program Connect to talk to each others 15 min.
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Realtime class system
(1) Video/Audio System(2) PPT Synchronization(3) Staff communication
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RPT
Remote PowerPoint Tool Slide synchronization from lecturer to
partners Use IRC to communicate (but different
channel to staff talking channel)
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Realtime Class Components (2)
UDL Link
AI3 network
Partner#1 Partner#2
Lecturer site
PPT slide page number
PPT
PPT
IRC server
RPT machine
RPT machine
SFC lecture studio
PPT
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Step 5: RPT
TA will show you the demonstration Every sites join to RPT, lecturer will
move slide 15 min.
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Equipments for realtime lecture
VIC/RAT, WMT machine – Video camera, Microphone, Speaker– (Mixer/Echo canceller)
RPT machine IRC machine 2 projecting boards/projectors 1 staff
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Partner classroom
students
IRC Machine
VIC/RAT Machine RPT Machine
Staff
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Lecture Procedure
1. New Course Announcement2. Course Enrollment - optional3. Lecture Announcement (1 day before)4. Lecture Material Announcement 5. Lecture Preparation (30 min. before )6. Operating Realtime Lecture session 7. Operating Q/A session
VIC/RAT, BBS8. Lecture report
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Troubleshoot VIC/RAT, WMT
– System problem• Ipv6 install, window firewall
– Connectivity problem• Check Multicast v6, Unicast v4 & v6
– Quality problem• Japan -> your site – report through irc• Your site -> Japan, others
– Check the sending rate of VIC/RAT – Audio traffic (RAT) is more important than Video
• Other sites -> your site – report through irc
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IRC, RPT, others– Connectivity problem
• Unicast v4 to IRC server
– Slide doesn’t change (first time)• Check if you are in and correct IRC channel
– Slide doesn’t change (after sometime)• May be disconnected from IRC• Reconnect
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Trying to JOIN but not yet success
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Connected, RPT will work after this
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Click to reconnect
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SOI Asia A/V setting
Better Audio Quality Prevent Echo
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Echo Loop
A B
RATRAT
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Echo Loop
Always TURN OFF your microphone when you are not talking
Do not select talk on RAT if not talking Cannot avoid during Q/A
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Echo loop
A B
RATRAT
A
B+A
Should be deductedUsing echo canceller
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SOI Asia A/V set
Echo Canceller– To reduce the echo
Mixer– To control the audio level
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Echo canceller
2 inputs– Local sound (Voice from Microphone+Remote
Sound fed to the microphone)– Remote sound (Output from RAT)– Compare and deduct repeated sound
2 outputs– Local sound (Only voice from Microphone)– Remote sound (Output from RAT)
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Mixer
Sound Redirection Better Audio Quality
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Echo canceller
VIC/RAT PC
OUT2
LINE IN ( MINI)
MAINOUT(LR) Speaker
Microphone IN1
LINE OUT ( MINI)
IN1
OUT1 IN2
FX SENDPHONEIN2
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GAIN(Control the MIC volume)
EQUALIZER(To control audio effect)
FX(Volume to FX Send)
PAN(To control LR)
LEVEL(Volume to speaker)
PHONES(Volume to Headset)
MAIN MIX(Volume to Speaker)
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Thank you!!