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频时间
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  frequency time
     The paper first analyzed these two time frequency analysis methods — short time Fourier transform and short frequency time transform, and illustrated that time frequency analysis method can be used to depict temporal properties of signal in detail by theoretical re cords;
     本文首先分析了短时Fourier变换和短频时间变换这两种时频分析方法,通过理论记录说明时频分析方法可以细致地刻画信号的时间特性;
短句来源
     then applied the short frequency time transform method to analysis and p rocessing of seismic signal.
     然后将短频时间变换方法应用于地震信号的分析与处理中。
短句来源
     The analysis results of real data showed in the pap er indicated the application meaning of time frequency analysis method in seism ic signal analysis and processing: using short frequency time transform — a go od analysis tool can make us a clear knowledge of time frequency structure of d ata and energy distribution, thus providing a basis for further selecting a reas onable data processing plan.
     文中展示的实际数据分析结果表明了时频分析方法在地震勘探信号分析与处理中的应用意义,即利用短频时间变换这一有效的分析工具,可使我们对数据的时频结构和能量分布有清晰的认识,为进一步选择合理的数据处理方案提供依据。
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  “频时间”译为未确定词的双语例句
     DDS output frequency was up-converted to drive the M/N PLL, reducing phase noise, which is better than -87dBc/Hz@1kHz, -92dBc/Hz@10kHz, decreasing frequency-hopping time which is less than 14us.
     DDS上变频后驱动M/N锁相环路,大幅度改善了相位噪声,相噪<-87dBc/Hz@1kHz、-92dBc/Hz@10kHz; 对DDS频率、参考分频比R1和环路分频比N1的三重调节,回避了大杂散的DDS频点,且保证了400MHz带宽内全部频点的实现,杂散<-55dBc,跳频时间<14us;
短句来源
     The analystic results on the scheme proposed in this paper show that the loop-gain, opened-ollp, closed-ollp and error transformer functions are unrelated with the ratio N of division frequency, and the natural frequency, damping coefficient and the instantaneous phase of VCOalso unrelated with N.
     分析结果表明环路增益、开环、闭环和误差传递函数与分频比N无关,环路自然频率、阻尼系数和VCO瞬时相位也与N无关,且实验结果表明这种方案中跳频时间与跳频步长无关,其跳频时间比现有方法改善一个数量级。
短句来源
     The frequency interval is 100 Hz,switching time less than 0.01 second.
     频率合成器的输出频率范围2~29.9999MHz,频率间隔100Hz,换频时间小于0.01s。
短句来源
     Research on Converting Time of Frequancy Synthesizer with 1KHz Resolution
     减少1kHz分辨率频率合成器换频时间的研究
短句来源
     The paper studies the technology of frequency synthesizer of radar frequency agile, presents some good practical design methods, introduces a new technique of measurement of frequency hopping time and finally, gives out two practically developed results.
     对雷达捷变频频率综合器技术进行研究,提出一些实用性好的设计方法,介绍一种比较新的跳频时间测量技术,并给出两种实际研制结果。
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  相似匹配句对
     Time
     时间
短句来源
     Time is...
     时间
短句来源
     The Measurement of Hopping Time for Frequency Synthesizer
     率综合器跳时间测试
短句来源
     Introdrction and Study on Time Spread Frequency Code
     时间码信号及研究(摘要)
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     Uni-direction Selection of Frequency
     单向选
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  frequency time
In addition to previous classical studies, additional terms that are suppressed by factors of one over the frequency time compactification radius are also calculated.
      
The Stevenson approach to low-frequency time-harmonic wave scattering, that expanded the electric and magnetic fields in power series of k, essentially the inverse wavelength, is scrutinized.
      
It requires the inversion of the frequency time-series of the light intensity observed by a photodetector which represents the absolute values of the time-derivative of the thickness variation.
      
Hyperpolarization-induced frequency time courses are significantly slower than those evoked by membrane depolarization.
      
These features make the method well suited for financial market applications, and in particular for the analysis of high frequency time series and for the computation of cross volatilities.
      
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This paper gives the test results of gain-suppresion and experimental curves of 500 μs long storage time in memory-storage TWT which is the key device in frequency memory. The measurement of the pitch of a slow-wave structure in memory-storage TWT shows that a large error inpiteh is one of the main reasons of memory failure. The effects of the change of attenuation on storage time in various delay lines are also compared.

本文给出了储频装置关键器件——储频行波管的增益抑制特性和500μs长时间储存特性的测试结果。对储频行波管慢波线螺距的测量结果表明,螺距误差大乃是储频失效的重要原因之一。文中还就不同延迟线的衰减变化对储频时间的影响进行了对比。

This paper introduces a kind of frequency synthesizer with lkHz frequen- cy resolution,which is used in hopping transceiver.Frequency and phase demodulators and swallowing pulse technique are used in the synthesizer to realize single loop lock at lkHz within the band of FM.Three practical ways of decreasing the converting time, esp.the one of changing phase demodulation frequency are introduced,which have nev- er been found in ealier literatures.

本文介绍一种1kHz 分辨率的频率合成器,该合成器可用于跳频电台,本合成器采用了数字鉴频鉴相器和吞脉冲技术,实现了在整个调频波段1kHz 分辨率的单环锁定.在此基础上提出了3种具体减少换频时间的措施,尤以独到的改变鉴相频率的方法,在不增加任何电路配制的情况下,大大缩短了换频时间.

In this paper,the author has introduced the hardware version operating principle and circuit parameter design of a kind of short wave radio station frequency synthesizer which consists of MCI45146 and MC12017/18.The frequency output range of the device covers from 2 MHz to 29.9999 MHz。The frequency interval is 100 Hz,switching time less than 0.01 second.The onerations and relations of frequency of respective PLL are introduced as well as the result of circuit paramater,the experiment results have also been given....

In this paper,the author has introduced the hardware version operating principle and circuit parameter design of a kind of short wave radio station frequency synthesizer which consists of MCI45146 and MC12017/18.The frequency output range of the device covers from 2 MHz to 29.9999 MHz。The frequency interval is 100 Hz,switching time less than 0.01 second.The onerations and relations of frequency of respective PLL are introduced as well as the result of circuit paramater,the experiment results have also been given.

该文介绍一种采用Motorola公司MC145146和MC12017/18蕊片构成的短波电台频率合成器的硬件电路实现方案。频率合成器的输出频率范围2~29.9999MHz,频率间隔100Hz,换频时间小于0.01s。文中论述了这种多环数字式频率合成器工作原理,各环路之间对应的频率关系和电路参数的选择,给出了频率合成器的试验结果.

 
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