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BROADCAST SYSTEMS

BROADCAST SYSTEMS. Symmetrical Communication System – same trasmission capabilities in both communication directions a-b,b-a. Eg.Telephones, GSM • Asymmetrical Communication System - Client /Server Environments (Client need more data than server) www

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BROADCAST SYSTEMS

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  1. BROADCAST SYSTEMS Symmetrical Communication System –same trasmission capabilities in both communication directions a-b,b-a. Eg.Telephones, GSM •Asymmetrical Communication System -Client /Server Environments (Client need more data than server) www -Television Setup Box –Movies & Shopping Information (Between Channels) UNIDIRECTIONAL BROADCAST SYSTEMS -High Bandwidth data stream exists from one sender to many receivers -Sender Optimizes the transmitted data for the whole group of user

  2. BROADCAST TRANSMISSION

  3. Cyclical Repetition of Data • Broadcast sender doesn't know when a receiver starts listen to transmission • Cyclical representation of data blocks send via broadcast is BROADCAST DISK

  4. Digital Audio Broadcasting • Single Frequency Network • VHF /UHF • DQPSK –Modulation • FEC & Uses Guard Spaces • Two Mechanisms (i) Main Service Channel (Msc) (ii) Fast Information Channel (FIC)

  5. DAB Mechanisms

  6. DAB SENDER

  7. DAB RECEIVER

  8. Multimedia Object Transfer Protocol • Broad Range of Different Receiver Capabilities • Atleast able to recognize all program associated data • DAB defines a standard for Data Transmission MOT (to support all data formats)

  9. Formats • MHEG -> Multimedia&HyperMediaInformation Coding Experts Group • JAVA • JPEG –> Joint Photographic Experts Group • ASCII • MPEG -> Moving Pictures Experts Group • HTML,HTTP,BMP • GIF-> Graphics Interchange Format

  10. MOT Structure

  11. Digital Video Broadcasting

  12. DVB

  13. Convergence of Broadcasting and Mobile Communication

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