噪

Besides having the invariant to the translation,scaling and rotation,the wavelet moment has the multiresolution properties so it is suitable for classing the very similar objects.

小波矩除了具有矩特征的平移、缩放和旋转不变及抗噪性强的特性以外，还增加了小波对图象结构精细特征的把握能力强的优点。

Orthogonal wavelet transform is not possessed with linear phase or translation invariant features, so there are still many problems in the field of signal noise reduction, such as signal oscillation phenomenon.

其中正交小波变换不具备线性相位、不具有平移不变性等特性，导致其在信号降噪领域仍存在很多问题，会使信号产生振荡现象。

The measuring system is realized on the basis of the trigonometric measuring principle.

在该系统中，对涉及的系统硬件设计、光刀图像去噪技术、光刀中心提取、测量系统软件设计以及误差分析等问题进行了深入研究。

Then, the "minimal slope discarding" method is applied to obtain the optimal truncation point and the rate control is realized, The proposed method can effectively reduce the computation of Tier-l up to 84.5% and cause only 0.094dB PSNR loss for the reconstructed image in the case of 0.25bpp bit rate.

实验结果表明，在0.25bpp比特率时，本算法减少了84.5%的层1编码的计算量，而重构图像的信噪比仅损失0.094dB。

It is widely used in express-way,railway and tube tunnel and enjoys a glaring feature of being envi-ronmental-friendly, noise-absorbing,fireproof,corrosion resistant,therefore it is suitable for severe environment characterized by gale,heavy rain,strong sunlight,dampness and heavy dust.

我厂研发的新型"隧道专用吸音板"和"铁路隔音屏障吸音板"等系列产品，安装在铁路两侧和隧道内壁，它具有隔音吸音、降噪、A级防火防潮、耐腐蚀、抗老化、环保美观等功能，能有效降低道路机电车辆产生的噪声，美化道路、隧道环境。

Finally, complex multilevel threshold is used to suppress the white-noise in ultrahigh frequency PD signal which is got from stimulant GIS in lab.

结果表明，采用分层复阈值技术的复小波变换抑制自噪声的效果更好，在高信噪比或噪声抑制比的情况下，对信号的畸变也更小。

The ultrahigh frequency portable reader obviously improves the signal-to-noise ratio of RFID antenna for receiving signals, improves the reading and writing distance, reduces the influences of the environment on the signals and has the advantages of low cost and good effect, etc.

本发明显著改善了RFID天线接收信号的信噪比，提高了读写距离并减少了环境对信号的影响，具有成本低、效果好等优点。

But the PER is still much higher than that of existing technologies in low SNR.The high reliability of UMB system' s high data rate is also confirmed,the link level performance of UMB system is far ahead of the third-generation communication technologies.

而低信噪比下其误包率仍远高于现有技术，并证实UMB系统高数据速率的高可靠性，UMB系统在链路级性能上远远领先于第3代通信技术。

The means of adaptive adjustment of learning rate is introduced, and then the unbiased risk estimate of signal can be obtained with high operating speed.

因此，必须找到一种有效的信号处理方法，在去噪的同时，最大限度的保证欣号的特征信息不会丢失。

Db8 wavelet and the soft threshold based on Steins Unbiased Estimate of Risk are used to smoothly denoise.

为进一步提高局部放电信号的提取精度，采用Db8小波及无偏似然估计阈值规则进行平滑去噪。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。