We should choose the suitable sweep signal and good test method to improve the precision and accuracy of frequency.
为提高扫描过程中频率的精度和准确度需要选择合适的扫描信号和检测方法。
A novel method of direct digital synthesizing frequency sweep signal is presented.
介绍了利用直接数字合成技术产生频率扫描信号的新方法。
The method of digit fast sine sweep frequency is used in nonlinear suspention system frequency feature numerical solution.
本文针对非线性悬架，研究通过数字快速正弦扫频获得其频域特性的数值解的方法。
The frequency value, sweep method and sweep rate can be input by keyboard.
频率值，扫频方式和扫频速平均可由键盘输入。
Image processing method is used to carry out frequency sweep and voltage sweep measurement. The in-plane motion characteristic of MEMS is obtained and the testing results are analyzed and discussed.
利用图像处理方法对MEMS谐振器做扫频和扫压测量，获得了MEMS器件的平面微运动特性，并对测量结果进行了分析和讨论。
The testing error and the reason of error are analyzed, compared with the results received by the sweep-frequency measurement method.
将微悬臂梁和微薄膜振动特性的测量结果与频率扫描法的测试结果进行了比对，对产生的误差及误差来源进行了分析。
Start frequency, stop frequency and sweep time of the signal synthesized by the method can be preset freely and controlled accurately.
被合成的频率扫描信号的起始频率、终止频率和扫描时间可根据需要随意设定，并且可以实现对三者的精确控制。
After the sequence passes through digital-to-analog converter and low pass filter, the desired frequency sweep signal is synthesized by the method of direct digital synthesis.
该序列通过数-模转换器和低通滤波器后，产生出频率扫描信号。
After the sequence passes through digital-to-analog converter and low pass filter, the desired frequency sweep signal is synthesized by the method of direct digital synthesis.
该序列通过数-模转换器和低通滤波器后，产生出频率扫描信号。
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