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Title: The Television, From Analog to Digital, And Somewhere In Between

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Subject: Technology
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Date: May 21, 2008
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Length: 9 / 2495
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All modern television systems utilize beams of electrons that sweep across the screens of camera tubes or receiving tubes. The advantage of scanning with an electron beam is that the beam can be moved with great speed and can scan an entire picture in a fraction of a second or faster...

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Each line contains hundreds of bits of the image, which is called the video signal. There are four parts of the signal: ? a series of fluctuations corresponding to the fluctuations in light intensity of the picture elements being scanned ? a series of synchronizing pulses that lock the receiver to the same scanning rate as the transmitter ? an additional series of so-called blanking pulses; ? a frequency-modulated (FM) signal carrying the sound that accompanies the image...

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