direct to home technology
TRANSCRIPT
Direct to home (DTH) television is a wireless systemfor delivering television programs directly to theviewer’s house.
In DTH television, the broadcast signals aretransmitted from satellites orbiting the Earth to theviewer’s house
The DTH provides more than 200 televisionchannels with excellent quality of reception alongwith teleshopping, fax and Internet facilities.
Satellite television solves the problems of range anddistortion by transmitting broadcast signals fromsatellites orbiting the Earth
Introduction
There are five major components involved in a directto home (DTH) satellite system: the programmingsource, the broadcast center, the satellite, the satellitedish and the receiver
The Overall System
The programming source are simply the channels thatprovide programming for broadcast
Satellite TV provider get programming from two majorsource: International Channels(such as HBO,ESPN &CNN)&various Local Channels(Sahara TV,Doordarshan ).
The Programming Source
At the broadcast center, the television providerreceives signals from various programming sourcesand beams a broadcast signal to satellites ingeostationary orbit.
The broadcast center converts all of this programminginto a high-quality, uncompressed digital stream.
At this point, the stream contains a vast quantity ofdata about 270 megabits per second (Mbps) for eachchannel.
In order to transmit the signal from there, thebroadcast center has to compress it.
Otherwise, it would be too big for the satellite tohandle
Broadcast Centre
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
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.
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
Under unfavorable climatic conditions the service remains unavailable.
The service is interrupted in case if the direction of dish is disturbed.
Limitation of DTH
Direct To Home Technology connects urban , rural andremote areas of the country and provide desireinformation, communication, education and entertainmentat the click of button.
Conclusion
References
http://www.dth.com/
http://www.dthindia.com/
http://en.wikipedia.org/wiki/Direct-broadcast_satellite
http://www.ddindia.gov.in/