2) Normalized value of sum-difference signal
和差信号归一化值
3) difference signal
差信号，差异信号
4) differential pressure signal
差压信号
1.
Analysis of differential pressure signal based on wavelet transform and higher-order statistics;
基于高阶统计量和小波变换的差压信号分析
2.
EMD is applied to the differential pressure signal of two-phase flow to obtain frequency components with different scales, and the normalized energy of the component is extracted as the feature of flow pattern identification.
应用EMD将差压信号分解成不同频率尺度上的单组分之和,并提取组分的归一化能量作为流型辨识特征量。
3.
Because the differential pressure signal of oil-gas two-phase flow was a typical non-stationary and multi-component signal,EMD was first applied to break up it into Intrinsic Mode Functions(IMFs) which can be divided into three frequency bands such as high-band(30~50 Hz),mid-band(5~30Hz) and low-band(0~5 Hz).
油气两相流差压信号是一典型的非平稳多组分信号,经验模态分解首先将差压信号分解成9阶本征模函数,按照频率范围可以划分为3个子带:高频带(30~50 Hz),中频带(5~30 Hz)和低频带(0~5 Hz)。
5) differential mode signal
差模信号
1.
Using Multisim circuit simulation software simulation,with examples of the difference circuit depend on the ability to enlarge the output circuit forms,and entry forms unrelated simulation of the circuit differential voltage transmission characteristics of the circuit on the differential mode signal Larger role of the common mode signal suppression.
利用Multisim电路仿真软件的仿真功能,结合实例说明了差分电路的放大能力只取决于电路的输出形式,与输入形式无关;仿真了差分电路的电压传输特性;研究了电路对差模信号的放大作用,对共模信号的抑制能力。
2.
Features of Multisim8 software and differential amplifier for the simulation analysis are introduced,research on how to enlarge differential mode signal and restrain common mode signal.
简要介绍Multisim8软件的特点,并对差分放大电路进行仿真分析,研究其如何实现对差模信号放大和对共模信号抑制。
6) signal difference
信号差分
1.
To investigate the modulation recognition of Phase Shift Keying (PSK) signals widely used in satellite Communication, such as pi/4-QPSK and 8-PSK , an algorithm for modulation recognition based on higher-order cumulants of signal difference is proposed.
针对卫星通信中常用的数字调相信号pi/4-QPSK、8PSK的调制识别问题,提出了一种基于信号差分高阶累积量的识别算法,该算法利用信号差分的四阶和八阶累积量特征对pi/4-QPSK、8PSK信号进行识别。
2.
To investigate the automatic modulation recognition of phase shift keying(PSK) signals widely used in communication signals currently,such as BPSK,QPSK,π/4-QPSK and 8-PSK,an algorithm for modulation recognition based on higher-order cumulants of signal difference is proposed.
针对当前通信信号中常用的数字调相信号BPSK、QPSK、π/4-QPSK、8PSK的调制识别问题,提出了一种基于信号差分高阶累积量的识别算法。
3.
Pyroelectric IRFPA imaging system and its basic signal processing, including nonuniformity correction and signal difference, etc.
讨论了热释电型红外焦平面阵列成像系统及基本的信号处理 ,包括信号差分处理、非均匀性校正等 ,利用自扫描光电二极管列阵 (SSPA)对热释电型红外焦平面阵列成像系统进行了模拟实验 ,获得了满意的图像 。
补充资料：采样和信号再现
采样和信号再现
sampling and signal reproduction
为保证采样信号经适当处理后能再现原连续信号，采样周期的选取应符合采样定理。丢琶—于不一-┌─┬─┐│ │…│└─┴─┘ 图1采样 (a)被采样的连续信号;(b)采样开关; (c)采样信号 连续信号x(t)变换为频域函数X(f)，其频谱如图2(a)所示。理想采样信号的表达式为x。(t)一x(t)x艺叔t一。T)，经傅里叶变换后化为频域函数:x;(f)一粤至x(f一。式)。若采样频率fs一粤为几 T。里扩“、“’，s’。侧z卜门~一“’TZ子““的两倍，则有图2(b)所示的理想采样信号频谱，fll为连续信号中所含的最高次频率。在图2(b)中，包含原连续信号频谱以及无限个经平移的原连续信号频谱。若使理想采样信号通过一截止频率为几和一几的低通滤波器，则滤波后的频谱与原连续信号的频谱完全一致，即再现了原信号。采样频率人必须大于被采样的连续信号中所含最高次频率的两倍，这就是香农(S hannon)采样定理，它是保证采样信号再现成原信号的必要条件。一Zfs一介一几O几乃2几f (C) 图2连续信号和采样信号频谱 (a)连续信号频谱;(b)采样信号频谱; (c)频谱混叠 若大<2几，则产生频谱混叠，如图2(c)所示，一几至几间对应于原连续信号频谱的高频分量和平移频谱的低频分量混叠在一起，经过低通滤波，也不能恢复原信号的频谱，必须避免这种情况的发生。colyong he川n匕00 zolx{on采样和信号再现(sampling and signal repro-duction)连续信号经采样产生离散信号和离散信号近似地恢复为原连续信号。它用于采样控制系统的分析研究。 如图1所示，连续信号x(t)经采样器采样后成为脉冲序列。采样器是以采样周期T重复开闭动作的采样开关。经采样开关输出的脉冲序列为采样信号瓜(t)，:为采样持续时间。 当:足够小时，采样信号x。(t)为连续信号x(t)与单位冲激序列价(t)一艺武t一nT)的乘积，即xs(t)一x(t)价(t)。这种情况称为理想采样，是实际采样的理想化，用以简化采样过程的分析，而不影响本质。低通滤波器的特性如图2(b)中矩形虚线框所示，这是理想化了的，实际上无法做到准确的矩形。因此，fs刚刚大于2几还不够，而是应该有相当的裕度，工程上一般取fs一(4一6)介。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条