DDS (direct digital synthesis) is a sort of frequency synthesis technique, which has advantages such as short frequency conversion time, high resolution in frequencies, programmability and so on.
直接数字频率合成(DDS)技术是目前广为应用的一项频率合成技术，它具有频率转换时间短、频率分辨率高、可编程等特点。
The system is capable of sampling, conversion and various calculations in both time and frequency domains.
可完成数据的采集、转换，并进行时间域和频率域的多种运算。
USES frequency conversion control system, can real time monitoring gas supply lines gas pressure, make the gas supply pipe gas pressure constant, improve the production efficiency and product quality.
采用变频控制系统后，可以实时监测供气管路中气体的压力，使供气管路中的气体的压力保持恒定，提高生产效率和产品质量；
By adjusting the driving pulse increment, the bright dark conversion to maximize the number of dark and light switching frequency optimization goal of homogenization in per unit time were achieved.
通过调整驱动脉冲增量，实现了单位时间亮暗转换次数最大化和亮暗转换频率均匀化的优化目标。
Relatively familiar with the time domain, frequency domain is very helpful to understand and master the many effects of signal integrity between the two can be FFT conversion.
时域相对比较熟悉，频域则非常有助于理解和掌握许多信号完整性效应，两者之间可通过傅立叶变换相互转换。
This paper discusses the application methods on solving frequency function and sets examples, in the two integral characters of time domain on Fourier conversion.
该文讨论傅氏变换中的二个时域积分特性，在求解频谱函数中的应用方法，并举例予以说明。
However, extending the upper frequency of such function signal generator is limited by the read-out time of the memory and the conversion rate of the digital-to-analog converter.
可是，这种信号发生器的上限频率的提高受存储器的读取时间和数模转换器的转换速度的限制。为了提高数字法函数信号发生器的上限频率，我们提出了用分布存储式数字法生成函数信号。
Duble frequency conversion struchre, simplfied structure. easy to maintain, less wear and "long time".
双变频简约机械结构，易维护，磨损少，寿命长。
For RF PA, always require it can output a certain power within a range of frequency, at the same time meeting the system nonlinear requirements and have high conversion efficiency.
射频功率放大器总是要求在一定频率范围内输出一定的功率，同时满足系统的线性度和高效率要求。
The technical characteristics of the device is: the frequency conversion invert circuit consists of the connection of a time base integrated circuit and a triode;
其技术特征是：变频逆变电路由时基集成电路和三极管连接而成；
At the same time, the application of frequency conversion can also save power consumption, and improve economics benefits within the operation of the tunnel ventilation system.
同时，变频调速的应用还可以节约大量电能消耗，提高隧道通风系统运营的经济性。
At the same time, the application of frequency conversion can also save power consumption, and improve economics benefits within the operation of the tunnel ventilation system.
同时，变频调速的应用还可以节约大量电能消耗，提高隧道通风系统运营的经济性。
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