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SUMMER TRAINING ON DOORDARSHAN {PPT]
- 1. PRESNETATION 1Presented by Ashray Kumar (Diploma) Branch - Eelctronic Final Year
- 2. Contents • Introduction • TV Studio • Vision mixer • Audio & video chain • MSR • Earth station 2
- 3. Introduction process of sending information to a distant place is called Broadcasting. • Means of Broadcasting in India: 1. Terrestrial 2. Satellite 3. Internet • Both AIR & DD make use of both Terrestrial & satellite. 3
- 4. Introductioncontd… • Broadcasting started in India in the year 1923. • AIR was formed in the year 1936. • In 1947, AIR was covering 2.5% & about 11% of land & population respectively. • 1st T.V Station was established in Delhi in 1959 • T.V was separated from AIR in 1976 • DD has 1500 Transmitters and 70 Production centers across the Country. 4
- 5. TVstudio 5 • A television studio is an installation in which television or video produc tions take place.
- 6. ComponentsofTVstudio • Camera • Lighting • Microphones • Vision mixer and Audio consoles • MSR • VTR • Acoustics • Post production and video effects • Supporting services like AC, UPS 6
- 7. VisionMixer 7 • A vision mixer (also called video switcher, video mixer or production switcher) is a device used to select between several different video sources and in some cases mix video sources together and add special effects. • It has many input sources such as cameras, VCR/ server, Graphics/Character Generators,etc. • Out of these i/p, any source can be taken as o/p. • Sources can be changed as cut to cut, dissolve, wipe and other special effects.
- 9. Typicalaudiochain 9 Distributor Audio Console Analog to AES Converter Earth station through Optical Fiber STL Link Sources
- 10. MSR(MasterswitchingRoom) • It is the heart of the studio. • Most of the switching electronics is kept e.g. camera base stations, switcher main frame, SPG, Satellite receivers, MW link, DDA & most of the patch panels. • Signal is routed through MSR. • Signal can be Monitored at various stages 10
- 11. Earthstation 11 • Earth Station is a very important part of satellite communication system for broadcasting of signals. • It is an uplink center from which the signals are fed to Satellite for distribution in a specified area covered by the Satellite. • The signal is up-linked from the Earth Station and received by many down link centers in TV broad casting via PDA. • Two Types: 1) Analog 2) Digital • Digital Earth Stations are widely used because of various advantages over analog.
- 12. MajorComponentsofDigitalEarth Station 12 • PDA (Parabolic Dish Antenna) • FEED • Wave Guide / Low Loss Cable • HPA (TWTA, Klystrons) • Up converter • Modulator • Encoder • Multiplexer • IRD (Integrated Receiver Decoder)
- 13. Microwavelink 13 Audio and video signals are feed to micowave transmitter. Input video is processed and up converted to 12.25 & 12.30 GHz. Approx transmission power is 600 milli watts Transmit/ receive station is 1.1 m in diameter.
- 14. DSNG • Audio/ video input is processed by an encoder as per mpeg-2 standard. • The audio and video along with other data are multiplied. • Multiplied data forward error corrected using a standard technique. • Error corrected codes are QPSK modulated at 70 MHz. • The modulated signal is up converted to power amplifiers. 14