cd,vcd,dvd有什么区别（Whats the difference between CD, VCD, and DVD）.docVIP

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2017-09-05 发布于河南
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cd,vcd,dvd有什么区别（Whats the difference between CD, VCD, and DVD）.doc

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cd,vcd,dvd有什么区别（Whats the difference between CD, VCD, and DVD）

cd,vcd,dvd有什么区别（Whats the difference between CD, VCD, and DVD） Many people dont know what MV and MTV have different? Just one more T, In fact, those music videos we daily see, we say MTV is only a special broadcast television network MUSIC VEDIO. This is not its real name. Because many people are First impressions are strongest ideas, thought the music video is MTV. In fact is not the case, MTV is actually a TV station. As early as August 1981, one specializing in playing visual songs television network, music television network (MTV) came into being, the commercial television network has become the most popular cable television history. MV, is the real name of the music video that we usually see, also is the visual song. Visual English songs correct translation should be MUSIC VEDIO, or MV, this is the real name of it. On the surface, DVD disk and CD/VCD disk is very similar. But in fact, there are essential differences between the two. If you think that the difference between DVD and CD/VCD is the only playback, seems a bit too simple. 1, from a technical point of view DVD/CD is the same, because they are the groove will need data stored in the CD tracks in tiny, and then through the laser beam CD-ROM for reading work. But in terms of the density of the disc, DVD to be much larger than CD/VCD, so when you need to read DVD data than read CD/VCD data when the shorter wavelength laser beam. Because the only way to be able to make the laser beam more accurately in the disc above focus and positioning. CD the minimum pit length is 0.834 m, spacing of 1.6 m, with a wavelength of 780 ~ 790nm infrared laser to read the data, while the DVD minimum pit length is only 0.4 m, spacing of 0.74 m, with a wavelength of 635 ~ 650nm infrared laser to read data. In 2, when playing video VCD can only reach 240 line standard, and DVD can be as high as 720 line standard, so in the resolution, DVD occupy the absolute advantage. 3, in the data capacity. CD/VCD can only accommodate about