低频

In DTMF there are 16 distinct tones. Each tone is the sum of two frequencies: one from a low and one from a high frequency group.

DTMF有16种不同的按键音，每个按键音为两个频率之和，一个频率来自于低频组，另一个来自于高频组。

The motion decay tests in still water and in re gular head waves were carried out to analyze and verify the low frequency dampin g in surge motions.

在海洋环境的作用下，该系统具有小振幅的高频纵荡、垂荡、纵摇及大振幅低频纵荡运动。

At this text I bring forward effective project strategy of non-maturity haleness watermark model arithmetic. Making use of time-frequency local characteristic of wavelet switch, I bring forward digital image watermark insetting project basing on block of wavelet switch, at the first ,make the image disporting to block of 8×8,then make use of the characteristic of Haar wavelet switch,then make the image the second layer wavelet switch and carry through power modulus transaction.

本文提出了非完备性鲁棒性数字水印典型算法中的行之有效的设计策略，利用小波变换良好的时频局部特性，提出了基于块的小波变换的数字图像水印嵌入方案，把宿主图像分为8×8的小块，利用 Haar小波变换的特性，对图像进行二层小波变换分解，对变换系数进行权重处理，然后把每一个水印象素隐藏在相应的图像块的中低频小波系数之中，提高了数字水印的隐蔽性和鲁棒性。

The numerical result shows that the contributions from the interface optical phonon mode with higher frequency and the LO-like half space mode to the binding energy and the Stark energy shift are important and obviously increase with increasing hydrostatic pressure, whereas the interface optical phonon mode with lower frequency and the TO-like half space mode are extremely small and are insensitive to the impurity position and hydrostatic pressure.

数值计算结果表明，高频支界面声子模和类LO半空间声子模对于结合能和斯塔克能移的影响是主要的，且随压力的增加而显著增大，而低频支界面声子模和类TO声子模的作用则很小，且对于杂质位置和流体静压力的变化不敏感。

Because the Hall probe circuit, magnetic-flux meter circuit and extension measurement circuit share the same A/D converter, but MAX110 only have two channel, so the system use CD4052. CD4052 is the analog switch controlled by microcomputer, which can switch the three input channels. The singles is passed to microcomputer after A/D converted.

所有与模拟电路有关的低频接口控制线都采用光电耦合器TPL521进行隔离，而频率较高采用6N137构成单片机相关外围器件的隔离，以便抑制数字电路的尖脉冲和其他噪声对模拟电路产生干扰，提高系统的信号噪声比。

The fast Hankel transformation algorithm is used to study the diffractive modulation property of laser beam propagation in high power laser facility.

文摘：利用快速汉克尔变换算法研究了高功率激光在自由空间传输过程中形成低频调制的规律，给出了衍射调制深度与光束宽度及传输距离等参数之间的变化关系。

This apparatus has better curative effect on such chronic diseases as neurasthenic insomnia, headache, hemicrania, paralysis, bone joint arthropathy, hypertension, rheumatism joint pain etc.

九九针灸治疗仪应用针灸、低频电结合弱激光综合作用于人体，对治疗神经衰弱失眠、头痛、偏头痛、面瘫、退变性骨关节病、高血压、风湿性关节疼痛等多种慢性病症有较好的疗效。

Fiber layer ply increases, resonance absorbs frequency to increase to unit weight of; of shift of low frequency direction, sound power absorption coefficient increases in the begining more apparent, subsequently rate of hole of; of amplitude hasten delay increases, hempen fiber sound power absorption coefficient increases gradually.

纤维层厚度增加，共振吸收频率向低频方向移动；容重增加，吸声系数开始时增加比较明显，随后增幅趋缓；孔隙率增加，大麻纤维吸声系数逐渐增大。

Combining the heterodyne interferometer with microcomputer, a new vibration measurement system has been established.

本文还首次利用外差干涉仪与微机组成的测振系统成功地测量了低频微振动。

In low frequency and high definition situation, it has well applied foreground.

在对信号源有高精度要求的低频场合有很好的应用前景。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。