The basic calibration for a phasemeter include checking of phase angle measurement accuracy at equal signal levels for 4 different frequencies 相位计的基本校正工作包括按四个不同频率的相等讯号电平，检查相角测量的准确度。
Electrical installations for open - cast mines and quarries - recommendations for winning , stacking and processing machinery , pumps and low signal level and communications systems 露天矿和采石场的电气装置.第4部分:开采层叠和处理机械设备泵和低信号级及通信系统推荐标准
The integration of excitatory and inhibitory input signals plays an important role in the excitability of hippocampal ca1 neurons , which determines the output signal level from the hippocampus 兴奋性和抑制性传入信号的整合对于海马ca1锥体神经元的兴奋性发挥着重要的作用，并决定着海马输出信号的水平。
Many circuit design techniques are incorporated into the design of the proposed adm system so that the range of input signal level can be enlarged and the number of transistors used can be reduced 设计中采用了一些技术，增大了输入信号的动态范围，减小了电路的规模。其次，为了扩展芯片的应用范围，增加了部分功能电路。
The function of this device is to measure the parameters of remote signal including signal level , carrier frequency and snr , then based on these parameters to analyze by intelligent method , and as the result , the status of remote channel is concluded 主要实现对远动信号的电平、频率、信噪比等参数的测量，并在此基础上用模糊控制的思想对参数进行智能化分析，推断出远动信道的状况。
Then one remote supervision system based on virtual instrument technology is studied and realized . the system can measure parameters such as signal level , carrier frequency and snr of remote channel , and can estimate the state of remote channel based on this parameters , and can display the time - domain and frequency - domain wave real time of remote channel , too 针对目前远动监控方案的不足，研究并实现了基于虚拟仪器技术的电力远动通道监控系统，该系统可以对远动收发信电平、载波频率和信噪比三个通道参数进行测量，具有实时时域波形和功率谱波形显示功能，并能根据通道参数对通道状态进行综合判断。
The constitution , interface and control principle of main circuit , rectifier control module , inverter control module , generator ' s rotor speed and rotor position measuring module , information exchange module are discussed . specially , the methods of implementing signals level match in multi - voltage system , synchronizing with pc in parameters measurement and measuring rotor speed and rotor position with high precision are explained in detail 文中讨论了主电路、整流器控制模块、逆变器控制模块、电机转速和转子位置测量模块以及信息交换模块的组成、接口方法和控制原理，详细说明了系统中实现不同电压等级间信号电平匹配的方法、系统与上位机进行同步参数测量的方法以及实现高精度电机转速和转子位置测量的方法。
In addition , this paper discusses the application of the parameter - induced stochastic resonance in the m - ary pam signal transmission , and explains the mechanism to stochastic resonance in a new view . we found that the single well is able to distinguish different signal levels , based on which the theory for m - ary pam signal transmission via parameter - induced stochastic resonance was briefly developed . the error code rate of m - ary pam signal was obtained 此外，本文还初步探讨了参数诱导的随机共振在多进制数字调制信号传输中的应用，从不同的观点解释随机共振形成的机理，充分认识到非线性系统单势井的信号处理能力，并给出多进制信号误码率的理论公式，仿真实验表明这个研究方向具有很好的研究前景。
Adjustable signal levels , shielded housing , not to mention carefully selected components and a first - class signal - to - noise ratio together guarantee the perfect playback of your recordings . and the best thing about it : the phono preamp requires no additional drivers , no sound card and no external power supply . simply connect it to the your computer s usb port and start recording 它的外接式设计可完整的保护讯号并对抗失真，更不必打开计算机机壳进行安装，只要透过phono preamp将唱盘与计算机连接起来，就这么简单，也不用额外的驱动程序或电源，所有电源均来自usb埠。
Simulation base on link level is the simulating of independence components of system , it is made use of simulating of signal transforming and processing , in order to analyses signal character , parameter and processing course in signal level , the result of simulation can provide very important reference for the design and evaluation of system 链路级仿真是系统相对独立组成部分的仿真,主要用于模拟通信信号的实际传输和处理过程,便于从信号层面分析研究通信信号的特征、参数和处理情况,仿真的结果可为通信系统设计和评估提供极为重要的参考依据。
