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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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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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To melt the charge, radio frequency ( induction heating ) or resistance heating have been used.

为了熔化进料, 可用射频 ( 感应加热 ) 或电阻加热法.

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The earth's rotation and its motion around the sun add an appreciable frequency shift.

地球自转与地球绕日公转产生附加的频移.

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The relationship of the pure tone audiogram and DPOAE audiogram were tested. Results The detected DPOAE rate and DPOAE amplitudes in normal hearing group were significantly higher than that in other three groups ( P < 0.05).

结果纯音听阈正常组的DPOAE检出率及DPOAE振幅明显高于低频听力下降组、高频听力下降组及全频听力下降组（P＜0.01或0.05）；

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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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This effect, in analogy to its radiofrequency counterpart, is known as optical rectification.

同它的射频对应物相仿, 这种现象称为光学整流.

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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 band left their strobes on for 20 minutes.

该乐队演出时闪光灯曾20分钟频闪不息。

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There is an infinite number of harmonic-frequency components.

这里存在着数目无穷的谐频分量.

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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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But, by the research of many scientific workers actually indicate that the reason of the scarce of the frequency spectrum resources is the existence of" the empty frequency spectrum", and not full using of the frequency spectrum resources.

但是经过大量科研人员的研究却表明目前频谱资源的稀缺是由频谱资源未得到充分利用并且存在大量频谱空洞所导致的。

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With ordinary photocells, one can pick up the frequency between two different lasers.

用普通光电池, 人们就能够探测到两个不同的激光之间的拍频.

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Chapter three expounds on the development of various CCTV sports channels represented by CCTV-5, under the background of channel specialization. The developing status of local specialized sports channels is also compared to illustrate the superiority of CCTV sports channels.

第三章，研究频道专业化背景下以CCTV-5为代表的央视各类专业体育频道的发展情况，同时对比地方专业体育频道的发展状况并分析中央电视视体育频道的优势所在。

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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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The nitrate ion has four fundamental modes of vibration.

硝酸离子有四个基频形式.

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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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Frequent skimming or improper skimming can cause a much higher dross loss.

撇渣过频或操作不当会使浮渣损失很大.

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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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Today's Apple TV box offers an array of channels, from the well-known such as Netflix, YouTube, CNBC and Sky News to more niche content such as Crunchyroll, which shows Japanese animation.

如今的Apple TV机顶盒提供很多频道，从Netflix、YouTube、美国消费者新闻与商业频道（CNBC）以及Sky News等知名频道到播放日本动画片的Crunchyroll等较为小众的频道。

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The proposed algorithm estimates several possible frequency offset values in a wide frequency offset range, and then obtains the true frequency offset value by the false frequency offset elimination method.

该算法首先估计大频偏范围内可能的几个频偏值，然后去除其中的伪频偏，最终得到真实的频偏值，以达到纠正大频偏的目的。

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Rains are frequent here in spring.

这儿春季雨很频.

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It was used as a frequency divider and no numbers are decoded from it.

它被用作无解码输出的分频器.

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This phenomenon is called velocity dispersion.

这种现象称为速度频散.

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A nasal spray or drops would ease your symptoms, but don't overuse them or further congestion could result.

鼻腔喷剂或滴剂能减轻症状，但请勿使用过频，否则鼻塞可能会加重。

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And it presents an estimation method for frequency difference by means of data synchronization selecting the time window of AFC frequency difference estimation hi order to solve the problem that data symbol transition induces an enormous error of frequency difference estimation.

针对AFC频差估计中数据突变引起频差估计较大误差的问题，提出了利用数据符号同步对AFC频差估计时间窗口选择的AFC频差估计方法。

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Therefore, the channel image construction is the essential marketing strategy for any of the mature television channels.

因此，频道形象的构建与包装对于树立频道的良好社会形象和频道营销都起着直接的关键的作用，是成熟的电视频道必不可少的形象和营销战略。

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For the fundamentals , B'- B " is very small and therefore the lines are almost equidistant.

对于基频振动来说, B ′-B″ 很小,因此谱线是几乎等距离的.

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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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In both cases large power sources are required.

在两种情况中都需要大功率的射频源.

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