急需epon 或有线数字电视的中英文翻译资料

数字电视的概念

数字电视就是指从演播室到发射、传输、接收的所有环节都是使用数字电视信号或对该系统所有的信号传播都是通过由0、1数字串所构成的数字流来传播的，数字信号的传播速率是每秒19.39兆字节，如此大的数据流的传递保证了数字电视的高清晰度，克服了模拟电视的先天不足。同时还由于数字电视可以允许几种制式信号的同时存在，每个数字频道下又可分为几个子频道，从而既可以用一个大数据流--每秒19.39兆字节，也可将其分为几个分流，例如4个，每个的速度就是每秒4.85兆字节，这样虽然图像的清晰度要大打折扣，却可大大增加信息的种类，满足不同的需求。例如在转播一场体育比赛时，观众需要高清晰度的图像，电视台就应采用每秒19.39兆字节的传播；而在进行新闻广播时，观众注意的是新闻内容而不是播音员的形象，所以没必要采用那么高的清晰度，这时只需每秒3兆字节的速度就可以了，剩下16.39兆字节可用来传输别的内容。

如今，数字电视是人们谈论最多的热闹话题之一。由于数字电视是种新鲜事物，一些相关报道及文章介绍中出现似是而非的概念，诸如“数码电视”、“全数字电视”、“全媒体电视”、“多媒体电视”等，造成大众感到困惑，茫然不知所措。其实，“数字电视”的含义并不是指我们一般人家中的电视机，而是指电视信号的处理、传输、发射和接收过程中使用数字信号的电视系统或电视设备。其具体传输过程是：由电视台送出的图像及声音信号，经数字压缩和数字调制后，形成数字电视信号，经过卫星、地面无线广播或有线电缆等方式传送，由数字电视接收后，通过数字解调和数字视音频解码处理还原出原来的图像及伴音。因为全过程均采用数字技术处理，因此，信号损失小，接收效果好。

The concept of digital TV

Digital TV refers to launch from a studio, transmission and reception of all the links are the use of digital television signals or the system all the signals are transmitted through the string figures from 0,1 posed by the digital stream to the spread of digital signal The spread rate is 19.39 megabytes per second, such a large flow of data transmission ensure the high-definition digital TV, analog TV has overcome the inherent weaknesses. At the same time as digital television can also allow several standard signal of the existence of each digital channel under can be divided into several sub-channels, which can use a large data flow - 19.39 megabytes per second, can also be divided into Several triage, for example, four, each is the speed of 485 megabytes per second, although this image clarity to greatly reduced, it can greatly increase the types of information to meet different needs. For example, in a sports broadcast, viewers need high-definition images on TV should be used 19.39 trillion bytes per second transmission, and in news broadcasts, the audience noted that the news content rather than the image of broadcasters, So there was no need to use the high definition, then only 3 megabytes per second on the speed, and the remaining 16.39 trillion bytes can be used to transmit other content.

Now, people talk about digital television is the topic of one of the most lively. Since digital TV is kind of new things, some of the relevant reports and articles on the concept of a specious, such as "digital television" and "all-digital TV," "All the television media", "multi-media television", causing confusion for the public, at a loss What to do. In fact, "digital TV," meaning they do not mean that we generally in TV, but the television signal processing, transmission, transmit and receive digital signals used in the television system or television equipment. Their specific transmission is: by the television images and sound out the signal, the digital compression and digital modulation, a digital television signal through satellite, terrestrial radio or cable and other transmission from the digital TV receiver, digital solutions Reconcile the number of processing video and audio codecs to restore the original images and sound. Because the whole process of using digital processing technology, it signals the loss of small, good reception.

参考这里的..
http://baike.baidu.com/view/3084.html?wtp=tt
和http://translate.google.cn