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It is tempting to think of digital television as something very scientific and even complex. But when we view the end result, we find something very familiar; something television engineers have sought since the very beginning… an experience that just keeps getting better and better… quality video and audio conveying the artist’s performance to the viewing audience. The only thing new in digital television is the way the message gets from here to there.
Digital signals have been a part of television for many years, at first buried inside equipment such as test signal and character generators; later throughout entire systems. In this HD Video Test Guide, we will deal first with the video portion of the television signal for simplicity. Audio will be digital as well, and will take its place in the digital data stream for recovery at the television receiver. Digital audio will be discussed in later chapters.
Digital video is a simple extension of analog video. Once we understand analog video, it is easy to understand how digital video is created, handled, processed, and converted to and from analog. Analog and digital video have many of the same constraints, and many of the problems that may occur in the digital domain are a result of incorrect analog source video. Therefore, it is important to have standards to reference for the design and operation of both analog and digital video devices.
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