电视信号-----外文资料及译文.doc

Although over 50 years old , the standard television signal is still one of the most common way to transmit an image. Figure 8.3 shows how the television signal appears on an oscilloscope. This is called composite video, meaning that there are vertical and horizontal synchronization (sync) pulses mixed with the actual picture information.
These pulses are used in the television receiver to synchronize the vertical and horizontal deflection circuits to match the video being displayed. Each second of standard video contains 30 complete images, commonly called frames , A video engineer would say that each frame contains 525 lines, the television jargon for what programmers call rows. This number is a little deceptive because only 480 to 486 of

尽管已经拥有50年的历史了,电视信号依然是常用的传递信息的途径之一。图 8.3演示了电视信号如何出现在一个示波器上。这叫做合成信号,意谓有垂直的方向和水平的方向的合成(同步)和真实的图片数据混合的脉冲信号。
这些脉冲被电视接收器同垂直与水平线以及其他歪斜线路配和成信号并被电视显示出来。标准的信号每秒包含30个完整的图像,一般被做成了体格,电视工程师会把每个体格编制成包含525条行（电视专门术语）。因为在这些线中的只有80到486条包含了电视信