信号持续时间

它增加了信号持续时间，有效抑制了符号间干扰。

It increases the signal duration , effectively restrain the interference between the symbols .

结果表明：周期数目高的信号，频带窄，有利于频率控制周期数多，在时域内信号持续时间长，波形易叠加，一般折中选择。

The results show that the signal of a high number of cycles is usually of the narrow band and conducive to the frequency control , more number of cycles , and long signal duration in time , and the waveforms are easily superimposed .

通过该方式下传输的信号持续时间短，具有抗干扰能力强等优点，因此获得了越来越多地应用。

The signal transited by this mode has a shorter duration , so its anti-interference ability is stronger , and gets more and more applications in reality .

不同的损伤模式产生AE信号的持续时间、能量、频率等参数各不相同。

The parameters , such as duration , energy and frequency , of AE signals produced by different damage modes were different .

由于信号的持续时间短，需要采集的数据量大，需要很高的采集频率进行数据采集。

Owing to short duration of the signals and large amount of data , high collecting frequency is needed .

但由于这一信息非常微弱，且脉冲信号的持续时间很短，多普勒变化率的精确测量也十分困难。

While the information is quite difficult to estimate since it is very subtle and the pulse duration is very short .

室外观测发现，在23℃、86%RH时，雄萤飞行求偶闪光信号脉冲闪光持续时间为0.52s，间隔时间为0.28s，闪光信号的最大亮度为06lx；

Under 23 ℃ and 86 % RH , flying male adults emit flash signal with flash duration 0.52 s , interval 0.28 s , and flash intensity peak of 0.6 lx .

因此，在正常生理条件下，FGF信号的强度和持续时间必须受到严格的调控。

Inappropriate activation of FGF signaling can cause development diseases and cancers , so its strength and duration must be accurately regulated .

震源浅的地震异常信号强，累计持续时间长，其信号呈脉冲形式，震源深信号相对较弱，并显示低频脉动特征；

The anomalous signal of shallow earthquake is stronger , and appears pulse form ; For deep earthquake the signal is weak relatively , and appears low-frequency pulsation .

因此，尽量减少信号占有带宽，持续时间和存储容积，以节省信号在传输、处理和存储中的开销，具有巨大的经济价值。

Thus , the reduce of signal occupancy bandwidth , storage cubage and durative time can be done to save the spending of signal in transportation , disposal and storage and brought immense economy value out .

将机械构件线应变的检测转换为对检测信号波形高低电平持续时间的计测，并推导出时间计测值与构件线应变之间的数学关系式。

Let the detection of linear strain of mechanical components be transformed into the measurement upon the sustained time of high-low level of waveform in the detected signal , and the mathematical relationship between measured value of time and linear strain of components was derived .

针对突发信号与常在信号在持续时间上的差异，使用形态学骨架化算法获得信号的时间占用度，筛选突发信号的频率范围。

It obtains the occupied time rate using the method of morphology skeletonization algorithm and selects its frequency range for the duration characteristic of burst signal .

另外该方法可以精确地检测出杂音信号的起始点，从而得到杂音信号的持续时间，这一点对于临床诊断具有重要意义。

In addition , the method can accurately detect the starting point and the duration of a heart murmur signal , which is of great significance in clinical diagnosis .

实际上，通信对抗环境中截获信号的信噪比往往较低，信号持续时间较短、样本数据不足，现有方法直接用于外场同类通信辐射源个体辨识时往往识别率较低。

Actually , the received signals often have low SNR , and the seized signals have short duration , which results in insufficient samples . Thus , the recognition rate is low when using the existing methods .

在对各种汽轮发电机组动静碰磨过程的长期振动监测的基础上，分析了机组动静部件发生碰磨时振动信号的时域和频域特征：碰磨产生冲击振动信号，持续时间一般很短；

Based on the results of long-time vibration monitoring of rubbing in steam turbine the main signatures of rubbing vibration in time and frequent domain were displayed and analyzed .

很不走运的是，正如我们不知道外星人在哪里他们的信号需要传多远，我们也不知道他们的信号会持续多长时间。

Unfortunately , just as we don 't know where the aliens are and how far their signal must travel , so we have no way of knowing how long their signal would last .

造影剂信号的填入模式：从肿瘤的周边部向中心性充盈集中至峰值，随后信号强度持续一段时间逐渐减弱。

The wash-in pattern of the SonoVue sign was from the mass 's border into the center concentration to the peak-value , then the signal intensity gradually reduced after keeping for some time .