The generated SPWM waveform is filtered to get a sine wave, which features high frequency, wide frequency range, low distortion, and can be used in data communication as carrier. This method was successfully used in a software modem based on DSP. 产生的SPWM波经过滤波后转变成的正弦波,具有频率高、频率范围宽、波形畸变小的特点,可以用做数据通讯的载波,并且已经成功地应用在基于DSP的软件调制解调(SM)器中。
Consulting lots of references and form a full algorithm about π / 4-DQPSK software modem. 查阅大量文献,深入了解π/4-DQPSK调制解调原理并在此基础上形成具体的算法。
The system was comprised of fumigation-specific storehouse, monitor center, spot-inspection, monitor software, MODEM, PSTN, etc. 系统主要由熏蒸专用仓库、监控中心、现场检测、监控软件、MODEM和PSTN等部分组成。
Virtual Instrument represents a fire-new concept of instrument. Because of combining with computer technology, Virtual Instrument can make use of the computing power and software of modem PC to realize some function that traditional instrument can't realize. 虚拟仪器是一种全新的仪器系统概念,与传统的仪器不同之处在于虚拟仪器结合了计算机技术,因此能够利用计算机的强大硬件和软件功能实现传统仪器所无法实现的功能。
Taking the 9001 test system as an example, the authors introduce the application and principle of computer-aided test in the IC test technique, data processing by using software in modem testing, and ways of improving testing accuracy. 以9001测试系统为例,介绍计算机在集成电路测试技术中的应用及测试原理,以及现代测试中利用软件进行数据处理,提高测试精度的一些方法。