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1) Ch 1
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The waveform for a complete NTSC frame of data.
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whether or not you are interfering with their reception (or you may get a visit from your local FCC representative). If you nd that there are any problems with your home TVs or radios while this circuit is in operation, shut it down and use a different modulator or cable setup. These problems will manifest themselves as snow (white spots randomly on the screen) or audio static. You may nd that you are unable to use this application without causing problems in such a case, go on to the next project. With the caveats out of the way, let s look at the NTSC composite video signal produced by this application. After the tuner in your TV set has demodulated an incoming signal, the actual video information, called composite video, is passed to the video drive electronics. If you were to look at the composite video signal for an entire frame of data on an oscilloscope, you would see something like Fig. 21.50. In this gure I have identi ed two features that you will have to become familiar with. The rst is the vertical synch, which is a series of specialized pulses that tells the video drivers to reset the raster (the electron beam that travels across the CRT) to move to the top left-hand corner of the screen. During each line, data is output as an analog voltage. After the vertical synch is sent, video line data is sent, each line of the data being a corresponding line on the TV display. The description I m going to give here is for black and white composite video with no colorburst information. The colorburst is a 3.579-MHz sine wave that is output after the horizontal synch to allow the video circuitry to latch onto the phase of the color signal sent to the TV. Along with the brightness (or luminance) information, which consists
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of dc voltage levels, there is an analog signal attached to the signal as well for the color (or chromiance) value for what is displayed on the TV s screen. The color displayed depends on the phase of the 3.579-MHz chromiance signal by changing the phase of the signal, the color is changed on the display. Detection of the phase difference is accomplished using a phased-locked loop circuit. Composite video gets its name from the fact that it combines three different signals (the vertical synch, horizontal synch, and video data) all in one line. Special circuitry in the TV (or CRT as I will call it for most of this section) splits this information out to control how the output is displayed. The period of time between vertical synchs is known as the video eld. For NTSC composite video (which this circuit creates), 59.94 elds are displayed each second. One complete frame of video consists of two elds, with the raster scan line of one eld overlapping the other (which is known as interlaced video). The output produced by the project shown here produces the appropriate timing for the output data to repeat over two interlaced lines. As part of the vertical synch, a number of unused horizontal lines are passed at the same time and are known as vertical blanking. When the vertical synch is recognized within the TV and the raster moves to the top of the screen to begin scanning again, the CRT guns are turned off to prevent any spurious signals from being driven on the screen. The vertical synching operation is shown in Fig. 21.51. The analog voltage output used for synch pulses and CRT control are always at a level below the video data black level and are often known as blacker than black. The normal synch level is at 0.4 V, whereas the active synch pulse is at 0 V.
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