归一的作用是在各种不同合成情况下使输出噪声电平基本保持不变。
The function of normalization is to remain the output noise level unchanged in various cases of different synthesis.
环境噪声电平是评价频率通道能否可用的关键指标，因而正确测量环境噪声具有十分重要的意义。
Since the environmental noise level is the key index for evaluating the availability of frequency channels, it is very important to accurately measure the environmental noise.
本文就高压架空送电线路设计中，按实际工程情况计算短波无线电收信台所需防护间距时，环境噪声电平取值问题进行了初步探讨。
The level value for environmental noise when calculating the necessary protective space of shortwave wireless receiver in the design of high voltage trolly wire was discussed.
正是这种被称为信噪比的东西，即真实信号与噪声的关系引起了通信工程师的极大的兴趣。从本质上讲，如果信号比噪声电平大得多，则信息的传输是完美的。
It is the relationship of the true signal to the noise signal, known as the signal-to-noise ratio, which is of the most interest to the communication engineer.
实验与仿真结果表明：该系统采用音频开关而不导致电机负载的音频噪声，同时使EMI能被限制在低电平。
Experiments and simulations show that the proposed system can operate in audio switch frequency range without audio noise from the motor load, meanwhile, EMI can be limited to low level.
因为通常电声设备技术指标给出的是噪声准平均值电平，而不是噪声准峰值电平，这一点应加以注意。
Because normally the electro-acoustic equipment, technical specifications are given quasi-average noise level, rather than quasi-peak noise level, this should be noted.
声发射源与接收讯号传感器间的距离以及环境噪声的电平是选择频带的主要依据。
The distance between the acoustic-emission source and the receiving transducer, and the background noise level are primary factors in selecting a particular frequency band.
最后，讨论了频谱仪本地噪声对低电平信号测量影响的修正方法。
At last, correction method of low level signal measurement is discussed duo to effect of spectrum analyzer floor noise.
第二部分介绍了当存在相对高的测量系统噪声（示波器噪声）电平时，如何进行更精确低电平信号噪声和干扰测量的有用提示。
The second part is to introduce the useful prompt to measure the low level signal noise and its disturbance even more accurately when there is rather high noise level in measure system.
Keithley的《低电平测量手册》提供了关于使用同轴电缆和同轴三芯电缆的更多信息，包括低噪声电缆，以及电缆和连接器成套件。
Keithley's low Level Measurements Handbook provides more information about using coaxial and triaxial cables and connectors, including low noise cables, and cable and connector assembly.
围绕超高速这一特点，对系统的相位噪声、接收机噪声系数、发射功率、系统门限接收电平等作详细的论证，以确定总体设计方案。
Round the feature of the ultrafast speed, make the detailed description of phase noise, receiver noise figure, launch power, threshold level of system.
无杂散动态范围被定义为用dB表示的，接收机噪声和两个相等杂散信号的电平的差，这两个杂散信号的互调产物与接收机噪声相等。
It is defined as the difference in dB between receiver noise and the level of two equal spurious signals whose intermodulation products are equal to the receiver noise.
噪声门可将要求的音频信号在强度低于所选电平时无声以提供背景噪声控制。
The noise gate is used to mute an audio signal once it falls beneath a set level for controlling background noise.
当所述判断部分检测超过所述预定电平时，第一调节部分调节所述消除噪声部分的操作。
The first regulation section regulates an operation of the noise-canceling section when the judgment section detects that the predetermined level is exceeded.
当所述判断部分检测超过所述预定电平时，第一调节部分调节所述消除噪声部分的操作。
The first regulation section regulates an operation of the noise-canceling section when the judgment section detects that the predetermined level is exceeded.
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