中国测试精选文章 关键词：频率检测；频谱校正；变窗函数；短记录 [gap=1070]Key words: frequency detection； spectrum correction； variable window function； short record
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频率检测器 frequency detector ; Phase Frequency Detector ; PFD
相位频率检测器 PFD ; PHASE FREQUENCY DETECTOR
振荡频率检测器 OFD
检测频率 Inspection frequency ; test frequency ; polling frequency ; Inspection frequency/ test frequency
相位/频率检测器 Phase Frequency Detector
基音频率检测 Pitch Detection Algorithm
瞬时频率方差检测器 VIFD
无线电频率入侵检测 RAFID
In the part of the frequency mensuration, the reason of the mensuration error is analysed, and the exact synchronization between timing and counting signal is also achieved with the help of CPLD.
在频率检测部分，分析了测量误差的产生原因，并用CPLD设计实现了定时与计数信号的精确同步。
参考来源 - 便携式数字示波表设计So, the frequency measurement module with high readability, data sampling module, the phase shift trigger generator module and varied excitation limiting modules are designed. And the modules are embedded seamlessly in the macro software frame.
在软件设计中,遵循结构化、模块化、自顶向下、逐步细化的编程思想,成功地开发了可读性强的频率检测模块、数据采集模块、移相触发脉冲产生模块和各种励磁限制模块,并把它们无缝地嵌入到总体软件框架之中。
参考来源 - 基于DSP的同步发电机励磁控制器的研究The stability of the frequency detection circuit is 7×10~(-6).
频率检测电路的频率稳定度约为7×10~(-6)/s。
参考来源 - 声表面波气体传感器电路优化设计·2,447,543篇论文数据，部分数据来源于NoteExpress
通过实验研究了CQT和DFT在多音阶频率检测时的性能以及窗函数对CQT性能的影响。
Performances of CQT and DFT in estimating multinote frequencies and the effect of window function are studied through experiments.
介绍声表面波(SAW)气体传感器原理及其信号处理电路原理，重点设计了传感器的频率检测电路。
The principle of SAW gas sensor and signal processing circuit is discussed, especially a circuit of frequency measurement is designed.
结论：在目前国内无国家标准和行业标准对超声刀驱动频率检测前提下，实现了超声刀频率的定量检测。
Conclusion This paper realizes the quantitative detection of ultrasonic knife frequency without related national standard and industrial standard.
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