scanning. Hence the total number of lines are divided into two groups called fields. Each field is scanned alternately. This way of scanning is called interlaced scanning. 17.Define vertical resolution? The capability of resolving picture details in the vertical direction is called vertical resolution. 18.What is horizontal resolution? The ability of the system to resolve maximum number of picture elements along the scanning lines determines horizontal resolution. 19.List the contents of a composite video signal? Composite video signal consists of a camera signal, blanking pulses and synchronizing pulses. 20.What do you mean by pedestal? The difference between the black level and blanking level is known as the pedestal. 21.Define level? The peak-white level is defined as the level of the video signal when the picture detail being transmitted corresponds to the maximum whiteness to be handled 22.Define pedestal height? Pedestal height is the distance between the pedestal and the average value axis of the video signal. 23.What is the main function of the blanking pulses? The composite video signal consist of blanking pulses to make the retrace lines invisible by increasing the signal amplitude little above the black level of 75percent during the time scanning the circuits develop retrace. 24.What are per the post equalizing pulses? To rectify the drawback occurs on account of half-line discrepancy five narrow pulses are added on either side of the vertical sync pulse. These are called pre-equalising and post-equalising pulses . 25. Differentiate monochrome and colour camera tube. In black and white camera only one pickup tube is needed but three such tubes or its equivalent is necessary in color cameras to develop separate signals for red ,green and blue information present in the scene. 26. Why do we prefer horizontal polarization for television receiving antenna?
scanning. Hence the total number of lines are divided into two groups called fields. Each field is scanned alternately. This way of scanning is called interlaced scanning. 17.Define vertical resolution? The capability of resolving picture details in the vertical direction is called vertical resolution. 18.What is horizontal resolution? The ability of the system to resolve maximum number of picture elements along the scanning lines determines horizontal resolution. 19.List the contents of a composite video signal? Composite video signal consists of a camera signal, blanking pulses and synchronizing pulses. 20.What do you mean by pedestal? The difference between the black level and blanking level is known as the pedestal. 21.Define level? The peak-white level is defined as the level of the video signal when the picture detail being transmitted corresponds to the maximum whiteness to be handled 22.Define pedestal height? Pedestal height is the distance between the pedestal and the average value axis of the video signal. 23.What is the main function of the blanking pulses? The composite video signal consist of blanking pulses to make the retrace lines invisible by increasing the signal amplitude little above the black level of 75percent during the time scanning the circuits develop retrace. 24.What are per the post equalizing pulses? To rectify the drawback occurs on account of half-line discrepancy five narrow pulses are added on either side of the vertical sync pulse. These are called pre-equalising and post-equalising pulses . 25. Differentiate monochrome and colour camera tube. In black and white camera only one pickup tube is needed but three such tubes or its equivalent is necessary in color cameras to develop separate signals for red ,green and blue information present in the scene. 26. Why do we prefer horizontal polarization for television receiving antenna?
television___video_engineering.docx