Television Standard & Communication System used in Doordarshan

Doordarshan is government broadcasting organization and is one of the largest broadcasting organizations in India and popularly know as DD1. This is a good project which will tell you about the transmission of signals through the communication channels used in T.V broadcasting in Doordarshan. As you must be knowing standard TV broadcasting options are NTSC, SECAM and PAL and this report discuss about them. The main aim of this project report is to give clear script of how the different programs are generated and then transmitted from Doordarshan Kendra using PAL standard. You can also Subscribe to FINAL YEAR PROJECT'S by Email for more such projects and seminar.

The PAL and the NTSC system use a quadrature amplitude modulated sub-carrier carrying the chrominance information added to the luminance video signal to form a composite video baseband signal.

Worldwide there are only 3 Television standards which are used viz. PAL, NTSC, SECAM. National Television Standards Committee (NTSC) was developed in the US and first used in 1954, NTSC is the oldest existing broadcast standard that contains 525 horizontally traces connected with screen and also 59 directory traces. Only one form prevails, called NTSC M. It is sometimes irreverently referred to as "Never Twice the Same Color."

Systeme Electronique pour Couleur avec Memoire (SECAM) was developed in France and first used in 1967. It uses a 625-line vertical, 50-line horizontal display system. Various sorts make use of unique movie bandwidth and sound carrier technical specs. In VHF band Types B and D are usually. Types G, H, and K are used for UHF. Types I, N, M, K1 and L are used for both VHF and UHF. SECAM is sometimes irreverently referred to as "Something Essentially Contrary to the American Method" or "SEcond Color Always Magenta."

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Phase Alternating Line or PAL is used in India for television broadcasting and uses a 625/50-line display system in variant of NTSC. Different types use different video bandwidth and audio carrier specifications in PAL. Common types are B, G, and H. Less common types include D, I, K, N, and M. These different types are generally not compatible with one another. Proponents of PAL irreverently call it "Perfection At Last," while critics of its enormous circuit complexity call it "Pay A Lot" or "Picture Always Lousy.

Analog television did not really begin for market prior to the development on the cathode-ray tubing (CRT), which often runs on the steered electron gleam to be able to "write" collections involving electrons around any phosphor lined surface area. The actual electron gleam might become swept over the screen much faster in comparison with almost any mechanized disk system, permitting a lot more closely spaced search within collections and much larger photograph resolution, though slow-fade phosphors taken away photograph glint outcomes. Additionally far less upkeep ended up being necessary of your all-electronic system when compared to any spinning disk system.

This summer training is done at Doordarshan Kendra Patna. This Doordarshan center has 2 division, first is production and second is engineering section. Use this report for your reference and stud work only.

Author:- Md Ejaz Mobashir

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