1.4 Multimedia Applications.pptx

1. MULTIMEDIA COMMUNICATION
MODULE 1: MULTIMEDIA COMMUNICATIONS
TOPIC: MULTIMEDIA APPLICATIONS

3. Multimedia Applications
•Application that involve multiple media types:
1. Interpersonal Communications: May involve speech, image,
text or video. (speech only, image only, text only, text & image,
speech & video)
2. Interactive Applications over the Internet: Browsing
through sales, literature, newspapers, etc.
3. Entertainment Applications: Movie/Video on demand,
interactive television

4. 1. Interpersonal Communications
• May involve speech, image, text, or video.
• May involve single type or integrated two or more type of media
involved
– 1. Speech only
– 2. Image only
– 3. Text Only
– 4. Text and Images
– 5. Speech and Video
– 6. Multimedia

5. SPEECH only

6. SPEECH only
•Traditional interpersonal communication - telephones connected to
PSTN/ISDN/PBX.
•Multimedia PC with a microphone and speakers - used to make
telephone calls through PC.
•Requirements – telephone interface card and associated software -
technology is computer telephony integration (CTI).
•Advantages - users can create own private directory of numbers and can
initiate a call by selecting the desired no. on the PC screen.
• Access circuits require more capacity/bandwidth.

7. SPEECH only
1. Voice mail:
– Used when the called party is unavailable.
– A spoken message - voice mail is saved in the voice mailbox, which is present at a
central voice mail server – this message can be read by the owner next time they
contact the server.
2. Teleconferencing:
– Involves multiple interconnected telephones/PCs. Each person can talk to all
the others involved in the call - conference call / teleconferencing call /
audio-conferencing call. Requires - central unit - audio bridge - provides the
necessary support to set up the call automatically.
• Internet telephony initially supported PC-to-PC communications –
extended to PC-to-telephony.

8. VoIP -Telephony over the Internet

9. VoIP -Telephony over the Internet
• As internet has packet mode operation
– both PC require software & hardware to convert speech signal from microphone
into packets and vice versa - Voice over IP (VoIP).
• Telephony gateway
– interworking unit used when a PC connected to the Internet makes a call to
telephone connected to PSTN/ISDN.
• PC requests to make a telephone call to a pre-allocated gateway using its internet
address
– If user is registered, the gateway will request the phone no. to establish the call from
the PC.

10. VoIP -Telephony over the Internet
• On receipt of this the source gateway will initiate a call with the gateway
nearest to the called party.
• The called gateway then establishes the call to the recipient telephone
using its telephone no.
• If the called party answers then a signal is sent back by the recipient
gateway to the PC via source gateway

11. Image only

12. Text only

13. Text only

14. Text and Image only

15. Text and Image only
• Application - involves both text and images integrated together is computer
supported cooperative working (CSCW) - the network used is
Intranet/Internet/LAN.
• Shared whiteboard - distributed group of people working on the same project can share
each others display.
• CSCW comprises a central “whiteboard program” and a linked set of support programs in
each PC/workstation with a shared window/workspace (shared whiteboard).CSCW made
up of 2 part :
– change –notification part – whenever any member of the group updates the
content of their whiteboard, this part sends details of the change to the whiteboard
program.
– update –control part - this part relays the changes to the display of all
other PC

16. Speech and video
• E.g. - video telephony.
• Requirement - terminals/PCs with video camera, microphone & speaker.
• Network must provide 2-way channel with sufficient bandwidth to
support the integrated speech and video.
• Bandwidth requirement of access circuit is also higher.

17. Speech and video

18. Video conferencing using broadcast network

19. Many-to-many videoconferencing
https://www.youtube.com/watch?
v=3MIV7jozFrk

20. •A multimedia email will consist of text, images, audio and video.
– E.g.- email applications consisting media types other than text are Voice-mail,
Video mail and multimedia mail.
•Voice-mail /Video-mail
•Multimedia mail
Multimedia

21. Multimedia electronic mail structure

22. 2. INTERACTIVE APPLICATIONS OVER THE INTERNET

23. • Entertainment applications are classified into:
- Movie/video-on-demand https://www.youtube.com/watch?
v=mvQze0vJgAg
- Interactive television
3. ENTERTAINMENT APPLICATIONS
https://www.youtube.com/watch?v=cvy-2UJJr
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24. MOVIE/VIDEO-ON-DEMAND

25. NEAR MOVIE-ON-DEMAND (N-MOD)