论文部分内容阅读
信号是信息的载体,信号通过有线或者无线的传输线路把信息传递。模拟信号是指在时域上数学形式为连续函数的信号。数字信号指幅度的取值是离散的,幅值表示被限制在有限个数值之内。数字信号有很多且定义规范,我们所熟悉的USB是电脑与周边设备通讯的传输协议。ADSL是互联网的传输协议。HDMI是视频传输的协议。在以上各种协议中对数字信号的各个物理量和指标都有着不同的、严谨的、细密的定义和要求。此文以USB信号为例,对USB的数字信号在传输线路中的品质结合传输线路的特性阻抗进行评估。
Signal is a carrier of information, the signal is transmitted through wired or wireless transmission lines. An analog signal is a signal whose mathematical form is a continuous function in the time domain. Digital signal refers to the amplitude of the value is discrete, amplitude representation is limited to a limited number of values. There are many digital signals and the definition of norms, we are familiar with the USB is the computer and peripherals communication protocol. ADSL is the Internet’s transport protocol. HDMI is the protocol for video transmission. In the above various agreements on the digital signal of the various physical quantities and indicators have different, rigorous, detailed definition and requirements. In this paper, USB signal is taken as an example to evaluate the quality of USB digital signal in transmission line combined with the characteristic impedance of transmission line.