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- Miniature passive hydrogen maser is developed at Shanghai Observatory which employs compact cavity design and square wave frequency modulation. 介绍了上海天文台被动型小氢钟的设计和研制,给出了初步的测试结果。
- This paper describes the basic principle and main performance of the SWFM-IM(square wave frequency modulation-intensity modulation) optical fiber transmission system with two accompanying sound channels for colour TV programs. 本文叙述SWFM-IM彩色电视双伴音光纤传输系统的基本原理和主要性能。
- Excellent staable are from Ac square wave, avoid high frequency hazard. 交流方波自稳弧性能优异,免除高频危害。
- square wave frequency 矩形波频率
- Adjustable square wave generator, square wave to control the amplitude, frequency, duty cycle. 可调方波发生器，可以控制方波的幅值，频率，占空比。
- Passing the square wave through a narrow bandpass filter centered on the square wave's fundamental frequency removes most of the harmonics. 通过一个中心位于方波基频的窄带带通滤波器，方波可以去除绝大多数谐波。
- The square wave source is an impulse source in which digital technique is used.It has the advantages of rigid phase, high frequency stabilization and high antijamming. 方波电源是采用数字技术的脉冲电源,具有相位严格、频率稳定度高,抗干扰能力强等独特的优点。
- Whenever a scope/probe combination for X10 and X100 probe changes. Recalibrate the high frequency response of the probe with the square wave on the scope. 无论何时X10和X100的探头与示波器组合改变，都需要用示波器上的方波校正探头的高频响应.
- Square waves, like sine waves, are periodic. 方波如正弦波一样是周期性的。
- The concept of square wave and EFT drive unit are introduced in this paper. 本文介绍方波信号发生器及场效应管驱动器的原理与设计。
- When the square wave signal pass the LPF,we can get the sine signal. 经过分析可知,检测过程中的低通滤波器对检测的精度和速度有重要影响。
- Introduce the principle of MOSFET AC square wave inverter power source. 介绍了MOSFET交流方波逆变电源的工作原理。
- A device that generates high-frequency pulses (usually a square wave) for purposes of synchronization and event timing.Most are crystal oscillators that take advantage of the inherent resonance of a (quartz) crystal to obtain frequency stability. 一种发生高频脉冲(通常是方波)的装置,以达到同步和事件定时的目的。大多数是晶体振荡器,它利用(石英)晶体固有共振的优点,所以频率稳定。
- The coefficient of variation (CV) of slow wave frequency and abnormal rhythm index (ARI) increased obviously. 慢波频率变异系数(CV)及异常节律指数(ARI)显著增加;
- The radiation wave frequency of semiconductor laser is shifted correspondently when the injecting current is changed. 半导体异质结激光器在注入的电流发生变化时，输出激光的光频也随之改变。
- A device that generates high-frequency pulses(usually a square wave) for purposes of synchronization and event timing. Most are crystal oscillators that take advantage of the inherent resonance of a(quartz) crystal to obtain frequency stability. 一种发生高频脉冲（通常是方波）的装置，以达到同步和事件定时的目的。大多数是晶体振荡器，它利用（石英）晶体固有共振的优点，所以频率稳定。
- The experiment expressed that the square wave unit and EFT drive unit designed work very well,and the high frequency AC square wave welding machine has alraedy used to welding thin steel sheed successfully. 实验证明,设计的方波信号发生器与场效应管驱动器工作稳定可靠,所研制的方波交流高频弧焊电源已成功地对薄钢板进行了焊接。
- The researchers may through expose the waterdrop under the different sound wave frequency may control its vibrational frequency. 研究人员可通过将水滴暴露于不同的声波频率下可以控制其振动频率。
- As an example of the technique, let's compute the Fourier series which corresponds to a square wave. 作为这种方法的一个例子，让我们计算一个方波的傅里叶级数。
- The relation between collisional absorption of the EM-wave and the plasma density, plasma collision frequency, and incident wave frequency is obtained. 给出了不均匀非磁化等离子体密度、等离子体碰撞频率、电磁波频率与碰撞吸收的关系。
