My seminar presentation in btech

1. WELCOME TO THE SEMINAR
ON
Direct to home television
Md. Arif Hussain
110301ECR072

2.  Introduction
 The overall system
 Advantage of DTH
 Limitation of DTH
 Conclusion
What I will cover !!!

3.  Direct to home (DTH) television is a wireless system
for delivering television programs directly to the
viewer’s house.
 In DTH television, the broadcast signals are
transmitted from satellites orbiting the Earth to the
viewer’s house
 The DTH provides more than 200 television
channels with excellent quality of reception along
with teleshopping, fax and Internet facilities.
 Satellite television solves the problems of range and
distortion by transmitting broadcast signals from
satellites orbiting the Earth
Introduction

4.  There are five major components involved in a direct
to home (DTH) satellite system: the programming
source, the broadcast center, the satellite, the satellite
dish and the receiver
The Overall System

5.  The programming source are simply the channels that
provide programming for broadcast
 Satellite TV provider get programming from two major
source: International Channels(such as HBO,ESPN &
CNN)&various Local Channels(Sahara TV,
Doordarshan ).
The Programming Source

6.  At the broadcast center, the television provider
receives signals from various programming sources
and beams a broadcast signal to satellites in
geostationary orbit.
 The broadcast center converts all of this programming
into a high-quality, uncompressed digital stream.
 At this point, the stream contains a vast quantity of
data about 270 megabits per second (Mbps) for each
channel.
 In order to transmit the signal from there, the
broadcast center has to compress it.
 Otherwise, it would be too big for the satellite to
handle
Broadcast Centre

7. Broadcast Centre
Multiple
xer
Modulati
on
Encrypti
on
Transmiss
ion
Encoder
(MPEG-
2)

8. Receiving Terminal
Receiving
Terminal
Dish
Antenna
Interface
Cable
Set Top
Box
LNB Feed
system

9. The curved dish focuses incoming radio waves
onto the feed horn.
Dish Antenna

10. LNB Feed System
 The central element in the feed horn is low noise block-
down converter.
 Block-down convertor (so called because it converts a
whole band or ‘block of frequencies’ to a lower band) i.e. it
converts the 12.2 to 12.7 GHz band to 950 to 1450 MHz

11. SET TOP BOX
 The basic Set Top Box (STB) takes the signal from the
satellite dish and converts it into a signal that can be
used by a TV, sound amplifier, etc.

12. Demodulation Digital
Demultiplexing
MPEG
Decoder
DAC

13. Advantages of DTH
 DTH offers better quality picture than Cable TV.
 DTH can reach remote areas where terrestrial
transmission and cable TV have failed to reach.
 DTH also allows for interactive TV services such as
movie-on-demand ,games and internet

14.  Under unfavorable climatic conditions the service
remains unavailable.
 The service is interrupted in case if the direction of
dish is disturbed.
Limitation of DTH

15.  Direct To Home Technology connects urban , rural and
remote areas of the country and provide desire
information, communication, education and entertainment
at the click of button.
Conclusion

16. References
http://www.dth.com/
http://www.dthindia.com/
http://en.wikipedia.org/wiki/Direct-broadcast_satellite
http://www.ddindia.gov.in/

17. Thank You

18. Any Questions??