谁能帮我翻译下面的一段话？不要用有道、谷歌翻译。。。我之前用过了，不合格啊，谁懂英文帮忙翻译一下吧

电视信号数字化，首先是将图像信号源输出的模拟电视信号进行PCM编码，即模数转换。对于PCM参数的选择与模拟信号的特性（如幅度、宽带、周期等）有密切关系。而且PCM参数直接决定了数字视频处理和传输的性能，以及接收端的图像质量。
论文首先根据课题任务对设计要求进行了分析，由此构建了系统的总体框图。由总的技术指标分解到框图的各部分。抽样频率分为5MHz和10MHz两种。PCM编码为8位。然后，详细介绍了各部分的设计原理。宽带放大器采用宽带运算放大器LM318，加反馈与增益调节，从而保证了所需带宽和输出幅度。A/D转换器采用最多抽样频率为15MHz的CA3318芯片；同步分离器采用集成芯片LM1881。从而降低了电路的复杂度。为了恢复视频信号的直流分量，还特别设计了三极管箝位电路，从而保证了送到A/D转换器的视频信号的不丢失直流分量。论文最后给出了设计的PROTEL电原理图。

The digital television signal, the first is the analog TV signal image signal source output in PCM code, namely the analog-to-digital conversion. Properties for the PCM parameter selection and analog signals (such as amplitude, broadband, cycle) is closely related to. And the PCM parameters directly determine the performance of digital video processing and transmission, as well as the receiving end of the image quality. Firstly, according to the task has carried on the analysis to the design requirements, the construction of a general block diagram of the system. By the technical indicators of decomposition to various parts of the diagram. The sampling frequency is divided into 5MHz and 10MHz two. The PCM code is 8. Then, introduces the design principle of each part of the. Broadband amplifier using broadband LM318 operational amplifier, and feedback and gain adjustment, so as to ensure the required bandwidth and output amplitude. A/D converter using at most sampling frequency is CA3318 chip 15MHz; synchronous separator adopts integrated chip LM1881. In order to reduce the complexity of the circuit. In order to DC restore video signal, also specially designed triode clamp, thus ensuring the video signal is sent to the A/D converter without losing the DC component. Finally, the PROTEL schematic design are given

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