Monochrome and Colour Television by R.R. Gulati

By R.R. Gulati

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Sample text

As illustrated there, the video signal is constrained to vary between certain amplitude limits. The level of the video signal when the picture detail being transmitted corresponds to the maximum whiteness to be handled, is referred to as peak-white level. 5 percent of the maximum value of the signal while the black level corresponds to approximately 72 percent. The sync pulses are added at 75 percent level called the blanking level. The difference between the black level and blanking level is known as the ‘Pedestal’.

3 is very similar to the cathode-ray tube used in an oscilloscope. The glass envelope contains an electrongun structure that produces a beam of electrons aimed at the fluorescent screen. When the electron beam strikes the screen, light is emitted. The beam is deflected by a pair of deflecting coils mounted on the neck of the picture tube in the same way and rate as the beam scans the target in the camera tube. The amplitudes of the currents in the horizontal and vertical deflecting coils are so adjusted that the entire screen, called raster, gets illuminated because of the fast rate of scanning.

8(b)) at vertical field frequency. It is apparent then, that any amplifier capable of reproducing this waveform would be required to have good square-wave response at 50 Hz. Any degradation in response as shown in Fig. 8(c) would result in brightness distortion. In order to have satisfactory square-wave response at field frequency, an amplifier must have good sine-wave response with negligible phase distortion down to a much lower frequency than the field frequency. In addition, to correct phase and amplitude response at the field frequency, it is necessary to preserve the dc component of the brightness signal.

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