频率

You can't hear waves of such a high frequency.

如此高频率的声波是无法听到的。

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PLL has excellent character of narrowband slot, making locked frequence has the same frequence stability and spectrum purity, and has excellent performance spur reduction.

锁相环有良好窄带跟踪特性，使被锁定的频率具有与参考频率一致的频率稳定度和频谱纯度，对杂散的抑制性能良好。

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The relations between two dimension time frequency power spectrum and two dimension space frequency power spectrum, time frequency and space frequency are presented.

建立了二维时间频率功率谱与二维空间频率功率谱之间的关系；建立了时间频率与空间频率之间的关系；

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Its frequency response has to be flat over the whole audio range.

它的频率响应在整个音频范围内有所下降.

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The frequency selectivity relies on the interaction between periodic structure and electromagnetic wave, which behaves as the total reflection ( for patches) or transmission ( using apertures) in the neighborhood of the element resonant frequency.

FSS的频率选择性源于其周期性结构与电磁波的相互作用。当入射波的频率接近贴片或孔径的谐振频率点时，FSS表现出全反射或全透射特性。

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From the beginning of electronic technical appearance, there conies out many different ways to get frequency source. Because of the good frequency stability, quartz crystal oscillator is mainly used as the precise frequency source.

电子技术发展至今，出现众多获取频率源的方法，其中晶体振荡器（又称：石英晶体谐振器）由于具有良好的频率稳定性而一直作为主要的精确频率源来使用。

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This machine has a clock speed of 1.6GHz.

这台机器的时钟频率为1.6千兆赫。

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After knowing the structure nature frequency, optimize the structure, such as disposal the point of support, reduce the number of elbow, change the thickness of pipe, setting the dilatant and so on, which offer a basic to avoid resonance.

当知道结构固有频率后，便可以通过优化结构，例如重新布置支点、减少弯头数、改变管的厚度、设置膨胀圈等方法，改变结构的固有频率，为避开共振频率打下基础。

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In Europe, AC is usually generated at 50 Hz.

欧洲的交流电输出频率通常为50赫兹。

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As you walk faster, you will find the arms bend naturally and more quickly.

走快时，你会发现手臂会自然弯曲，而且频率会更快。

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Amplifier self-oscillates at a frequency depending on the velocity of the fluid.

放大器自激振荡的频率就取决于流体的速度.

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The varying frequency is a natural phenomenon in the actual life that is often felt by people. The essential aim of the HHT is to describe this phenomenon and uncover its law, that is, to look for the instantaneous frequency of a signal.

变化的频率是现实生活中人们经常直观感觉到的现象，HHT的根本目的就是描述和揭示这种时变频率现象及其规律，即求信号的瞬时频率。

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Sound waves, light waves, and radio waves have a certain frequency, or number of waves per second.

声波、光波或无线电波等都有特定的频率，或者说是每秒的波数。

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Automatic frequency control ( AFC) system is used to adjust the frequency of microwave power source to match the inherent frequency of acceleratory tube.

自动频率控制（AFC）系统用于调节微波功率源输出的微波频率，使之与加速管的固有谐振频率匹配。

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The results showed that the HP 1-1 type frequency and the genic frequency of HP1 in patients with pulmonary emphysema significantly increased. Although the HP 1-1 type frequency in male patients increased, there was no significance by X2 test.

结果发现肺气肿患者Hp1－1表型频率和Hp1基因频率高于对照组（P＜0.05，P＜0.025），男性肺气肿患者Hp1－1表型频率虽然升高，但经X2检验差异无显著性。

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If the frequencies are low, this approach cannot be used.

若频率很低时, 这种方法就不能使用.

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Experimenters have succeeded in controlling the rate and regularity of the heartbeat.

实验者已经成功控制了心跳的速度和频率。

《柯林斯高阶英汉双解学习词典》

The reversion frequency is increased by the addition of mutagents.

逆转的频率靠加入诱发变因素而增加.

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The frequency synthesizer is the critical part of the transceiver, because it could meet the high requirement for the frequency stability, spectrum purity, frequency range and the number of output frequencies.

而频率合成器是射频收发机中的关键部分，它能满足对频率稳定度、频谱纯度、频率范围和输出频率个数等的较高要求。

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The basic theories of the frequency synthesis , PLL , DDS, DDS + PLL are introduced first in this paper.

本文首先介绍了关于频率合成、锁相环频率合成、DDS频率 合成 、 DDS+PLL频率合成等的基本理论.

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The other circuit is designed to resonate close to the desired frequency.

把另一线圈设计成在所有要求的频率范围内可与之谐振.

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The Doppler frequency can be obtained as a heterodyne or beat effect.

由于外差或频差效应,能够得到多普勒频率.

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Modified HQT extract drops ( high, medium and low frequency) can significantly reduce SP-R mRNA expression in nasal mucosa ( P0.001), in which high and middle frequency group was better than low frequency group.

黄芩汤各频率组均能显著降低鼻粘膜SP-r mRNA的表达量（P0.001），其中高、中频率组优于低频率组，以中频率组疗效最佳。

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Using the wave height gauge and laser Doppler velocimetry ( LDV), experimental results show that the jet flapping motions indeed lock in to the wave oscillations if the wave frequency is close to but lower than the nature frequency of jet flapping motion.

同时，波高计和多谱勒激光测速仪的测量结果显示，当表面波的频率接近但低于射流振翅运动的自然频率时，射流振翅运动的实际振动频率将被锁定在表面波的频率上。

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Speech is made up of sound waves that vary in frequency and intensity.

语音是由不同频率和强度的声波组成的。

《柯林斯高阶英汉双解学习词典》

This relation between the frequency and the field spectra was noted experimentally.

实验上已经发现频率和场频谱之间的这种关系.

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The designed DCXO adopts Pierce architecture. The frequency drift correction is done by using a 6-bit automatic frequency control ( AFC) signal generated by the feedback correction loop between the oscillator and the base band. The long term stable frequency output has been obtained.

所设计的数控晶体振荡器采用Pierce结构，利用基带与振荡器的反馈环路产生的6位自动频率控制信号，对振荡器的频率漂移进行校准，能得到长期稳定的频率输出。

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With this restricted frequency range it is not applicable to hydrocarbons.

这个较紧缩的频率范围不适用于烃类.

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The ZEEMAN frequeney is one of important working parameters of hydrogen maser frequency standards, so a special digital time and frequency synthesizer, which is used to measure ZEEMAN frequencies, was developed.

ZEEMAN频率是氢脉泽时间频率标准的一个重要工作参数，为此上海天文台研制了一种专用的数字频率合成器，用来测量ZEEMAN频率。

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The transmitterof DHF uses DDS to synthesize frequency.

发射机采用直接数字频率合成器(DDS)生成频率,具有精度高、频率跳变速度快的特点.

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