Frequency tracking is an important characteristic of ultrasonic power.
频率跟踪是超声波电源的一个重要特性。
It is traditional to use frequency tracking to realize integer period sampling.
传统的解决方法是采用频率跟踪技术实现采样的整周期性。
Aluminum ultrasound casting; ultrasound power; frequency tracking; power control.
铝合金超声铸造；超声波电源；频率控制；功率控制。
Better carrier frequency tracking performance can be gotten by adjusting the loop gain.
通过调整同步环路的环路增益，可以获得更好的频率跟踪性能。
Fluid density is measured by self push resonant principle and frequency tracking method.
流体密度的检测是采用自激振荡原理和频率跟踪法得到的。
Fluid density is measured by self-push resonant principle and frequency tracking method.
流体密度的检测是采用自激振荡原理和频率跟踪方法得到的。
Frequency tracking circuit is one of the special circuits used in the ultrasonic generator.
频率跟踪电路是超声波发生器中的一种特殊电路。
The automatic carrier frequency tracking scheme is accomplished by two steps in our system.
自动载波频率跟踪部分的设计分了两个主要阶段。
Automatic frequency tracking is the most important characteristics of ultrasonic machining power.
频率跟踪是超声电源的一个重要特性。
DDS and digital phrase-lock technology have been applied in FPGA to improve the accuracy of frequency tracking.
采用高精度的直接数字频率合成（DDS）和数字锁相环技术，实现了高频率跟踪精度。
For the limitation of the accuracy of IFM technology, the frequency tracking accuracy can't be examined directly.
由于现有瞬时测频技术精度的限制，无法直接对其频率跟踪精度进行检定。
Studies the resonator frequency temperature characteristic, then designs the middle-frequency tracking band pass filter.
研究了谐振子频率的温度特性并设计了频率跟踪带通滤波器。
An adaptive sampling frequency tracking algorithm which adapt to realization of precise real time harmonic analysis is introduced.
提出了一种适于高精度实时电力谐波分析的自适应调整采样频率的电网频率跟踪算法。
Simulation shows that the frequency measurement has preferable precision and voltage calculating is improved by frequency tracking.
该方法频率测量精度高，实行频率跟踪采样，提高了电压计算精。
The key technologies applied in this system, such as synchro-sampling, frequency tracking and Ethernet communication, are expounded.
在简述其结构的基础上，对故障录波系统的频率跟踪技术、同步技术以及以太网通信等关键技术进行了阐述。
The controlling loop includes start-up circuit, frequency tracking circuit, driving signal circuit, and water lack protecting circuit.
控制回路由启动、频率跟踪、驱动信号、缺水保护电路组成。
All digital Phase-Locked Loop frequency tracking and digital SPWM realization technology based on FPGA are emphasized in the research.
重点研究了基于FPGA的全数字锁相环频率跟踪技术和数字化SPWM实现技术。
It also introduces some key technologies as measurement initialization and frequency tracking in signal processing of Coriolis flowmeter.
介绍科氏流量计信号处理中测量初始化和频率跟踪等几个关键技术。
In the process of signal digital intermediate-frequency received, digital down convertion, frequency tracking of carrier and phase locked loop are the keys.
在信号的中频数字接收过程中，数字下变频、载波频率与相位跟踪是设计的关键所在。
The ventricular rate will ascend following the increase of sinus rate, having frequency tracking function. The exercise tolerance of patient will be increased.
心室率随窦性频率的增加而增加，具有频率跟踪作用，增加了病人运动耐量。
The system design method proposed by the paper examines the frequency tracking accuracy of the frequency agile radar synthesis detection unit at intermediate frequency.
本文提出了通过系统设计的方法将频率捷变雷达综合测试仪频率跟踪精度的检定在中频进行。
The frequency tracking method could rapidly track resonant frequency with the changes of network impedance and load force, and the tracking process was smooth and reliable.
频率跟踪方法能够随谐振网络阻抗及负载力的变化而迅速跟踪谐振频率，且跟踪过程平稳可靠。
For the PLL has better performances in narrowband filtering and frequency tracking, the paper presents a new method which based on PLL accomplish the spuriousness restrained.
PLL具有良好的窄带和跟踪特性，文中提出了基于PLL的窄带滤波器杂散抑制方法。
Real-time timing or fixed times downtime, boot maintain current status, The whole timing or fixed frequency tracking open action if they are qualified, Print the test report.
实时定时或定次数停机，开机保持当前状态；全程定时或定次数跟踪开启动作是否合格；打印检测报告。
The spectral leakage caused by the truncated signals results in frequency calculation error and slows frequency tracking. A Hanning windowed recursive DFT method is introduced.
但由于截断信号会产生频谱泄漏，使得相位和频率计算结果有一定误差，采用该方法跟踪频率，实时计算电网变化的频率速度较慢。
The system uses time-frequency tracking loops to extract phase errors from data subcarriers with frequency interpolation to compensate for the estimated carrier frequency offsets.
该方法使用了时频同步跟踪环路，从数据子载波提取相位误差，并利用频域插值补偿多个用户的估计频偏。
Frequency tracking means that sampling intervals of following sampling is updated according to new frequency estimation, so synchronous sampling error will be reduce step by step.
频率跟踪就是依据前一次频率估计修改下一次采样的采样间隔，从而使同步偏差越来越小。
A software based frequency tracking algorithm for protective relaying is analyzed thoroughly. in this paper, the availability of this algorithm under the non-noise condition is proved.
全面分析了一种保护用软件频率跟踪算法的性能，论证了在无噪声干扰的情况下该算法的有效性。
The' main factors resulting in local frequency tracking error are analyzed based on the principles of the tracking local oscillator for frequency agile radars of rotary tuning magnetron type.
本文从旋转变频磁控管式频率捷变雷达的本振频率跟踪原理出发，分析了产生本振频率跟踪误差的主要因素。
When advancing large thickness cutting, frequency tracking shall be properly adjusted slow, you'd better adjust it to stable cutting from zero position and ammeter pointer no longer shakes sharply.
在作大厚度切割时，变频跟踪应适当调慢，最好从零位起调至切割稳定，电流表指针不再激烈晃动。
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