The transmitter transfers three lines of signal including one line of audio signal , one line of video signal and one line of data signal which are pretreated singly at first , then processed by the way of the fdm , the pfm modulation , the driving laser source and finally transformed the light pulse and feeded in the fiber to be transmitted Pfm光发射机传输了一路音频、一路视频以及一路数据信号，三路信号各自先进行预处理后再频分复用， pfm调制，驱动光源，转换成光脉冲，馈入光纤进行传输。
Firstly , according to the characteristic of the video signal and 10mbit / s data signal and the problem that these two kinds of signal are transferred by a coaxial - cable , this paper analyses three optional schemes and designs the system in the mass which can transfer these two kinds of signal and analyzes the transmission characteristic of the system 首先,针对电视信号和10mbit / s数据信号各自的特点,以及用一根同轴电缆传输两种信号的需要解决的问题,从总体上设计了可以实现这二种信号同时接入的系统,对该系统的传输特点进行了分析,从理论上验证了该系统的可行性。
The clock recovery block of usb2 . 0 transceiver macrocell consists of phase locked circuit , such as pll and dll ( delay locked loop ) . this block use external crystal 12mhz sin signal to produce 60mhz , 120mhz , 480mhz clock signal , and can recover colock signal form date wave . it can support 480mbps ( hs ) and 12mbps ( fs ) word speeds as defined in usb2 . 0 specification . 目的是用锁相环电路? pll和dll (延迟锁相环)实现usb2 . 0收发器宏单元utm的时钟恢复模块。其中pll环路构成的时钟发生器将外部晶振的12mhz正弦信号生成60mhz 、 120mhz 、 480mhz等本地时钟信号。 dll环路依据本地时钟信号对外部数据信号进行时钟恢复。
Ts signal input interface into the data buffer . after finishing the data buffer parameters set by synchronous data output signal . on the dvb standard with the base - band formed after channel i , q signals . by the square root of roll - off filter for qam modulation , frequency modulation by the panel set up , qam have had to deal with the final if if interface circuit sent to the rf channel Ts流数据信号经输入接口送入缓存器，缓存器对数据进行整理后按设置参数输出同步数据信号，经符合dvb标准的各种信道处理后形成基带i q信号，经平方根滚降滤波进行qam调制，调制频率由面板设置，已调qam信号最后经中频if接口电路处理送至射频通道。
The forecast model based on wavelet and b - j method is to use the model to forecast after simplifying the enterprise signals without energy losing . it can explicit the mechanism of the process of signal basically , and determinate the action power and develop trend of the factor which is as a result of the signals " structure , then attain to change or maintain the development of signals 基于小波和b - j方法的数据结构分析和预测模型，通过对企业数据信号的无能量损失的简化处理，利用小波和b - j方法的组合模型对数据结构进行预测，从根本上明确该信号产生的机理，确定产生该结构的因素的作用力和发展趋势，从而达到改变或维持企业数据信号发展的目的。
Secondly , the interface circuits which can perform the video format conversion is depicted . the circuits use the ma156 chip to decoder three types of standard analog format video , such as pal , ntsc and secam , and digitalize them and encode the digital signals into the ccir 656 standard format data 接口电路使用ma156芯片对标准清晰度模拟方式( pal制、 ntsc制和secam制)视频信号进行解码处理,被解码的信号再经模数转换后被编码为ccir656标准8位数据信号,最后用wsc1115芯片进行视频格式转换,并以模拟或数字方式输出。
The process of noise elimination based on wavelet is to eliminate disturbed noise of enterprise signals which produced when it bored , conveyed and processed . the elimination noise process is to use the valve filter method to filter the high frequency coefficient , and reconstruct the low frequency and high frequency which noise have been eliminated , the signal after noise eliminated is more glossy and it is helpful to do the trend forecast it can analyze and do trend forecast to the total trend , periodic and sudden change of signals when do the trend forecast to the enterprise signals 基于小波方法对企业数据信号展开的消噪过程，主要是对经济数据在生成、传递和加工过程中产生的干扰噪声进行消除，消噪的方法主要是采用高频系数的阀值过滤法，通过对低频和过滤后的高频的重构可以还原出消噪后的信号，该信号的光滑性更好从而有益于对企业数据信号进行进一步的趋势预测。
