查询词典 signal noise ratio

In this paper, a different measurement method for CEO is demonstrated and subsequently a better beat frequency signal with the signal-to-noise ratio greater than 40 dB is obtained.

为了实现对锁模飞秒钛宝石激光器的相位控制，采用改进的相移测量装置，使载波包络频移信号的信噪比提高到了40 dB以上。

CCD works in field readout mode which can be realized as binning-technology in vertical direction and the noises of video signal are filtered by Correlated Double Sampling, the signal-to-noise ratio of system was enhanced.

采用相关双采样技术滤除了视频信号中的相关噪声，提高了系统的信噪比。

The relationships of signal-to-noise ratio of sampled signal, analog filter before analog-to-digital converter and sampling rate have been discussed, the results of the discussion have instructiveness for the design of digital receivers.

该文讨论采样后信噪比与模数转换器前的模拟滤波器以及采样率之间的关系，所得结论对数字接收系统设计有指导意义。

As the mine accidents happen frequently in recent years, the detecting technology for microseism becomes much more important. However, there is no advanced microseism detecting system at home. It's pretty important for microseisms denoising and Reversion. A wavelet denoising method is presented here to process microseism signal, and the microseism record can get high signal to noise ratio. Meanwhile based on the software of LabVIEW, s design of real-time detecting system for microseism based on virtual instrument is presented. The advantage of the virtual instrument was sufficiently exerted to achieve the real-time detecting and analyzing of the microseism.

以往基于DSP或其他单片机的微震系统，其资源的有限性很难达到理想的采集效果，同时也难以完成先进算法的实现，而对微震信号的去噪与还原在监测系统中起着很重要的作用；在深入分析小波变换的信号去噪方法基础上，对微震信号进行了处理，得到高信噪比的微震记录，实现了对噪声的有效抑止；同时在LabVIEW平台软件设计的基础上，实现了一种基于虚拟仪器微震实时检测的设计方案，充分发挥了虚拟仪器的优势，结果表明基于LabVIEW的微震系统能很好地完成实时监测及其分析。

In order to improve the signal-to-noise ratio of the pulsar signal, a wavelet denoising algorithm based on fuzzy threshold is put forward.

为了提高脉冲星辐射脉冲信号的信噪比，提出了基于模糊阈值的小波降噪算法。

The results show that, all the three methods can effectively correct the frequency, the energy centrobaric correction has the lowest precision and the ratio correction is the fastest and its precision is almost not affected by the change of signal to noise ratio.

结果表明：3种算法都可以使信号的频率更接近于真实值，其中能量重心法校正精度相对较低，比值法和相位差法精度较高，尤其是比值校正算法处理速度更快，校正的精度基本不受信噪比的影响。

A phase-locked amplifier is used to improve the signal-to-noise ratio of photoelectricity signal, and a computer is utilized to incept the sampling sig...

用锁相放大器来提高光电信号的信噪比，信号被快速采样后由接口电路输入计算机，自动给出所测单模光纤的模场半径。

The signal processing of narrow-beam radars are in the given direction to which the beam is pointing, so the received interferences and clutters only come from that direction and thus the signal-to-noise ratio is relatively high, and target detection is only need to be performed on the range-Doppler spectra, which has a relatively low demand.

而宽波束雷达则会接收到所有方位上的干扰和杂波，信噪比较低，除了需要在距离-多普勒谱上检测出目标外，还需要分别形成目标的阵列快拍以获取其空间谱估计。

The effects of the noise source and its direction of Chinese speech average frequency spectrum on the intelligibility of Chinese speech were discussed in different room acoustical characteristics and signal-to-noise ratio conditions.

在不同室内声学特性、不同信噪比条件下探讨汉语语言平均频谱干扰噪声及其方向对汉语语言清晰度的影响。

Noise in optical coherence tomographic imaging degrades the quality of images, so improving image's signal-to-noise ratio is a focal problem in the development of OCT system.

光学相干层析成像过程中产生的噪声恶化了其成像质量。提高图像的信噪比一直是光学相干层析系统研制中一个焦点问题。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。