second chroma amplifier from the color killer circuit ,it blocks the second chroma amplifier.Thus it prevents the color noise on black and white picture. 20.Briefly explain PAL-D system. The use of eye as the averaging mechanism for the correct hue is the basic concept of simple system. Beyond a certain limit , the human eye see the effect of ‘PAL’ colour changes on alternate lines hence the system needs modification. Considerable improvement found in the system of a delay line is used to do the averaging first and then present the color to the eye.This is called PAL-D or delay line PAL method and is most commonly employe in PAL receivers. 21.Briefly explain satellite TV broadcast system. Satellite TV is a TV from space. Broadcasters from earth transmit their programmes to specified satellites. Then, the transmissions are returned to receiving equipment on the ground. Therefore, the better the receiving equipment ,the higher the quality of the reception. Applications of satellite TV: The shear range of programmes currently available on satellite channel is very much impressive such as 24-hour music videos, news, and feature films. A variety of general entertainment programmes, sports ,children’s programmes , foreign language broadcasts and cultural programmes are all available for the keyboard dish owner. Some of these come through subscription channels and others by free to watch channels which are sponsored by advertising. Limitation: The limitation of the satellite TV is varying picture and quality .By adopting de-emphasis circuits we can avoid the variations. 22.Write short notes on Video disc system. The video disc is essentially a gramophone record with pictures on it.The first video disc was the laser optical and the second video disc system is based on the capacitance principle. 23.Write short notes on High definition Television. It aims at Improvement in both vertical and horizontal resolution of the reproduced picyure by approximately 2:1 over existing standards. Much improved colour rendition Higher aspect ratio of atleast 5:3 Stereophonic 24. Briefly explain CATV system. 25. Briefly explain Digital TV transmission and reception.
second chroma amplifier from the color killer circuit ,it blocks the second chroma amplifier.Thus it prevents the color noise on black and white picture. 20.Briefly explain PAL-D system. The use of eye as the averaging mechanism for the correct hue is the basic concept of simple ‘PAL’ system. Beyond a certain limit , the human eye see the effect of colour changes on alternate lines hence the system needs modification. Considerable improvement found in the system of a delay line is used to do the averaging first and then present the color to the eye.This is called PAL-D or delay line PAL method and is most commonly employe in PAL receivers. 21.Briefly explain satellite TV broadcast system. Satellite TV is a TV from space. Broadcasters from earth transmit their programmes to specified satellites. Then, the transmissions are returned to receiving equipment on the ground. Therefore, the better the receiving equipment ,the higher the quality of the reception. Applications of satellite TV: The shear range of programmes currently available on satellite channel is very much impressive such as 24-hour music videos, news, and feature films. A variety of general entertainment programmes, sports ,children’s programmes , foreign language broadcasts and cultural programmes are all available for the keyboard dish owner. Some of these come through subscription channels and others by free to watch channels which are sponsored by advertising. Limitation: The limitation of the satellite TV is varying picture and quality .By adopting de-emphasis circuits we can avoid the variations. 22.Write short notes on Video disc system. The video disc is essentially a gramophone record with pictures on it.The first video disc was the laser optical and the second video disc system is based on the capacitance principle. 23.Write short notes on High definition Television. It aims at Improvement in both vertical and horizontal resolution of the reproduced picyure by approximately 2:1 over existing standards. Much improved colour rendition Higher aspect ratio of atleast 5:3 Stereophonic 24. Briefly explain CATV system. 25. Briefly explain Digital TV transmission and reception.
television___video_engineering.docx