| 1. | Tri - level sync eliminates the dc component and provides a more robust way to identify the coming of synchronization in the signal chain
三电平同步方式消除了直流分量，提供了更有效的办法来确定同步信号在信号链的位置。 |
| 2. | 3 the effective value of a non sinusoidal periodic function is equal to the square root of the square sum of the constant component value and every harmonic component effective value
非正弦周期函数的有效值等于直流分量与各次谐波分量有效值的平方和的平方根。 |
| 3. | We revised frequency spectrum functions by using weighting factor - the distance between direct component and alternating component , and improved the acuity of focus measure curve
提出用交流分量到直流分量的距离作为加权因子对频谱评价函数进行改进，有效地提高了对焦评价曲线的灵敏度。 |
| 4. | Such problems as the attenuation of dc elements and sine waveform , voltage sag and frequency deviation should be taken into account in order to analyze the transient process in the power system
要分析电网的暂态特性，还必须考虑衰减直流分量和衰减正弦波，以及电压缺口和频率偏移等问题。 |
| 5. | A protection algorithm can be judged as having strong capability of anti interference if it can eliminate decaying direct current component and high harmonic whose frequency is not the integer times of system base - frequency
摘要能否滤除非系统频率整数倍的谐波和衰减的直流分量是衡量保护算法抗干扰能力的重要特徵。 |
| 6. | Based on the analysis of stable and transient waveforms in the power system , the paper use the exponent - typed signal to describe the signals in the power system including the dc element , fundamental , harmonics , interharmonics , subharmonics and the attenuation of the dc element and the sine waveform
根据对电力系统暂、稳态信号波形的分析，本文用指数型信号来描述电力系统信号(包括直流分量、基波、谐波、间谐波、次谐波以及衰减直流分量、衰减正弦波等) 。 |
| 7. | The use of mc33291 chip improves the performance of the device . moreover , for data disposal , we select the algorithm of the combination of fourier and difference algorithm . in the end , we present the interference - free methods in software and hardware of devices
此外，交流量采集完成后数据的处理将尤为重要，本文提出了用差分法消除傅氏所不能滤除的衰减直流分量，采用傅氏和差分相结合的算法;对于保护中经常遇到的开方运算，提出了逐次比较法对其进行计算。 |
| 8. | One thousand and twenty correlation spots are obtained by illuminating the crystal with the background image . in this paper , a novel multiple - spectrum ( ms ) filtering is proposed . it can efficiently suppress the dc term and noise , get a higher - resolution description of the image for correlation , make the correlation spot so obvious and let the correlation peak become sharp
本论文提出了新的多重频谱滤波法msf ( multiple - spectrumfiltering ) ，它能有效地抑制直流分量和噪声，较好地提取出图象的主要特征进行相关，使得相关点突出，相关峰陡峭，相关效果理想，它极大地提高了相关运算器的识别能力。 |
| 9. | In the digital inverter , we adopt the technology of digital dynamic waveform correction , which can compensate the delay between control signal and output waveform , and ensure the accuracy of control . at the same time , the technology of digital dc component adjustment was introduced , by which we can exactly compensate the control signal , and realize adjusting dc component of output on the premise of output performance
在基于dsp的数字变换器平台中，采用全数字波形校正技术，完全补偿了控制信号延时、功率管开关延时以及死区时间对输出spwm波形所产生的畸变，充分保障了变换器控制的准确性；采用数字直流分量调节技术，可以精确地对控制信号进行补偿，在充分保证输出性能的前提下，实现了输出直流分量的调节。 |
| 10. | To seek an appropriate algorithm is an important task for improving the accuracy of microcomputer transducer of electric variables . through comparison of all sorts of sampling methods , the conclusion is obtained : under the sampling rate of 12 point / cycle the fourier algorithm would meet the need of both accuracy and speed
通过对各种采样算法的分析，采用具有完全滤掉各种整次谐波和纯直流分量功能的傅氏算法且采样率为12点/周的交流采样方案，它是能兼顾精度与速度的“最佳”组合。 |
