Your SlideShare is downloading. ×
0
Presentation
Presentation
Presentation
Presentation
Presentation
Presentation
Presentation
Presentation
Presentation
Presentation
Presentation
Presentation
Presentation
Presentation
Presentation
Presentation
Presentation
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×
Saving this for later? Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime – even offline.
Text the download link to your phone
Standard text messaging rates apply

Presentation

518

Published on

0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total Views
518
On Slideshare
0
From Embeds
0
Number of Embeds
0
Actions
Shares
0
Downloads
4
Comments
0
Likes
0
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
No notes for slide

Transcript

  • 1. Utilization of Digital Television Technologies for E-learning LADL Conference 1st LOGOS Open Workshop 20 September 2007 Budapest Dr. Sándor Bozóki, András Gnandt, György Sogrik Antenna Hungária Corp.
  • 2. LADL 2007 Utilization of Digital Television Technologies for E-learnin E-learning infrastructure based on digital television networks planned in the framework of the LOGOS project
  • 3. LADL 2007 Utilization of Digital Television Technologies for E-learnin DVB Data Broadcast Configuration - enables delivery of e-learning material as files and packages Data broadcast server Content server User management and billing Data broadcast management ISDN/ Leased line/ Internet Content providers IP/DVB gateway Video/ audio signals QPSK modulator QAM/QPSK modulator OFDM modulator MUX Data broadcast provider Multiplex provider Data broadcast server Content server User management and billing Data broadcast management ISDN/ Leased line/ Internet Content providers IP/DVB gateway Video/ audio signals QPSK modulator QAM/QPSK modulator OFDM modulator MUX Data broadcast provider Multiplex provider
  • 4. LADL 2007 Utilization of Digital Television Technologies for E-learnin MHP based interactive television • MHP is an open standard API, standards for interactive television. • MHP works across all DVB transmission technologies (DVB-S, DVB-T, DVB-C, IPTV). • MHP has a core based around a Java virtual machine – DVB-J. • The innovation will result in MHP applications which run as fast as native ones. • MHP-based iTV technology enables e- learning applications accesible for all digital TV subscribers
  • 5. LADL 2007 Utilization of Digital Television Technologies for E-learnin MHP API • Resources are provided to MHP transparently • Portability: no direct addressing of resources, System software provides an abstract view • Application Manager manages the lifecycle of applications • API is the interface between applications and System software
  • 6. LADL 2007 Utilization of Digital Television Technologies for E-learnin MHP versions • MHP 1.0: Broadcast applications; Data via IP; Satellite, Cable and Terrestrial support (commercially introduced) • MHP 1.1: Applications via IP; Smartcard support; VOD support; DVB-HTML support (commercially introduced e.g. in Austria) • MHP 1.2: DVB-IPTV profile; non-DVB IPTV profile (commercially not available yet) • The latest versions allow for more sophisticated e-learning applications
  • 7. LADL 2007 Utilization of Digital Television Technologies for E-learnin MHP profiles • Enhanced Broadcast Profile – local interactivity, using remote control to interact with broadcast applications – No return channel • Interactive Broadcast Profile – IP over the return channel – TCP, UDP – DNS forward resolving protocols • Internet Access profile – HTTP 1.0 with persistent connection support and not using Keep-Alive when talking with proxies that doesn’t understand Connection – HTTPS • IPTV Profile – RTSP – IP Service discovery (checks the signalling of services, no request to do this more frequently than once per day) • The Internet access through television enables web-like e-learning experience (but, of course, the processing and presentation capabilities are still lower than in case of PC’s)
  • 8. LADL 2007 Utilization of Digital Television Technologies for E-learnin MHP profiles considered for e-learning Enhanced Broadcast Profile Interactive Profile Standalone learning Available, however only according to the broadcast schedule Course limitations: * Mainly movie * Some text and pictures, at the same time with the broadcast * Self-checking (test with Java) Records cannot be created about the students’ test results Self-educated learning Available, however only according to the broadcast schedule Course limitations: * Mainly movie * Some text and pictures, at the same time with the broadcast * Self-checking with interactive test Records can be created about the students based on their test results (can help enhancing the course) Self-educated learning Collaborative learning (Instructor-led, facilitated, etc.) Not available with pure MHP, because there is no communication among the students, nor with the facilitator. Not available with pure MHP, because there is no communication among the students. Communication with the facilitator is possible through the return channel.
  • 9. LADL 2007 Utilization of Digital Television Technologies for E-learnin MHP in broadcasting services • Typical applications: – EPG – Information services (superteletext, running banners) – Applications synchronized to the TV programs, like voting, games, (questioning tests for LOGOS) etc. – Electronic commerce and secure transactions • The methodology of the development and the basic components of the above applications can be reused for iTV-based e-learning applications
  • 10. LADL 2007 Utilization of Digital Television Technologies for E-learnin MHP based interactive television head-end system which can serve the delivery of e-learning applications
  • 11. LADL 2007 Utilization of Digital Television Technologies for E-learnin MHP content formats essential for e-learning • Picture formats: – JPEG – GIF – PNG – MPEG-2 I-frame • Text formats: – Monomedia text with UTF-8 character encoding – DVB-HTML - optional
  • 12. LADL 2007 Utilization of Digital Television Technologies for E-learnin MHP capabilities for e-learning • Dynamic HTML pages using scripts and return channel • Interactivity with defining actions for the remote control • Sending back information via return channel
  • 13. LADL 2007 Utilization of Digital Television Technologies for E-learnin Return channel technologies • PSTN/ISDN, ADSL, GSM, GPRS – most common return channels for DVB services. • DVB-RCT (Return Channel Terrestrial) – due to lack of frequency, it is not available on the market. • DVB-RCS (Return Channel Satellite) – terminals capable of two-way satellite communication are still rather expensive.
  • 14. LADL 2007 Utilization of Digital Television Technologies for E-learnin IPTV infrastructure for e-learning
  • 15. LADL 2007 Utilization of Digital Television Technologies for E-learnin Set-top-box capabilities System Content formats and services supported by the set-top-boxes and handsets on the market Video Audio Interactive application Supported services (AV decoding, presentation, VOD, PVR storage) DVB-T MPEG-2/H.264 MPEG-1 Layer 2/AC-3 MHP AV decoding, NVOD (Near Video On Demand), PPV, EPG, STXT (SuperTeleteXT), voting, chat, shopping, banking DVB-S MPEG-2/H.264 MPEG-1 Layer 2/AC-3 MHP DVB-C MPEG-2/H.264 MPEG-1 Layer 2/AC-3 MHP DVB-H H.264 AAC/AAC+/eAAC HTML (HyperText Markup Language) AV decoding, PPV (Pay Per View), NVOD IPTV MPEG- 2/H.264/WMT9 MPEG-1 Layer-2/MPEG-1 Layer-3 (MP3)/AC-3 ANT Fresco (sometimes Espial, Opera and Internet Explorer 6) offering HTML 4 and JavaScript. A/V decoding, NVOD, PPV, EPG, TSTV (Time Shifted Television), STXT, voting, chat, shopping, banking, VOD
  • 16. LADL 2007 Utilization of Digital Television Technologies for E-learnin Conclusions • We have designed and integrated a DTV content delivery platform in the framework of the LOGOS project. • The limitations of DTV comparable to PC must be taken into account when developing e-learning applications. • Content distribution via broadcast to many users is more cost-effective than via telecommunication channels. • Content delivery platform should be assessed with real t-learning content during the tests planned for the next phase of the LOGOS project.
  • 17. LADL 2007 Utilization of Digital Television Technologies for E-learnin Thank you for your kind attention! András Gnandt Antenna Hungaria Co. http://www.ahrt.hu gnandta@ahrt.hu

×