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Three new methods are provided, which are demodulation by means of envelop periodogram, multi-path signal and vector signal.

提出了包络周期图法、利用多途信号方法和利用矢量信号方法。

Compared to the ordinary PLL circuits, it can endure the short time appearance that occurs once in a horizontal line of the sync signal. It can adapt to the phase alternation character of a PAL video signal and recognize the phase alternation line. The local color sub-carrier can be generated for synchronous demodulation by the circuit.

该电路使用了全数字锁相环对色同步信号进行跟踪，与普通锁相环电路相比，它不仅能适应制视频信号中色同步信号每行出现一次和PAL制信号逐行倒相的特性，还能识别倒相开关信号，准确地产生本地色副载波用于同步解调。

The large signal and small signal SPICE circuit models of HBT and high-frequency model of PIN photodetector have been constructed.

建立了HBT的大信号与小信号SPICE电路模型以及PIN探测器的高频模型。

According to the measurement demand of weak photoionization signal, a new kind of photoionization signal detection instrument is developed.

根据微弱光电离信号的检测需要，开发出光新型离子化信号检测仪。

Data acquisition ; photoionization signal ; signal detection ; AT89C52

数据采集；光离子化信号；信号检测； AT89C52

The Polynomial Wigner-Ville Distribution is a time-frequency signal analysis tool for representing Polynomial Phase Signal.

多项式Wigner-Ville分布是分析多项式相位信号时频特性的一种有力工具。

A truncated Volterra series expansion, whose polynomial number can be determined by error criteria, was used to model the biomedical signal component. Based on Volterra we proposed an adaptive filter that could approximate and extract the signal in noise corrupted ECG data efficiently.

利用误差准则确定的Volterra序列展开能很好模拟生物信号成份，而基于Volterra序列的自适应滤波器能有效模拟ECG成份从而达到去除信号中噪声的目的。

Based on parametric model of signal-multicomponent polynomial phase signal,a novel time frequency kernel is presented.

立足于信号的参数化模型—多分量多项式相位信号，提出了一种新的时频分布并给出了其构造方法。

These new AMPLIFIER DESIGNS do not use lateral or substrate PNP transistors within the signal path, but incorporate parallel NPN and PNP input stages to accommodate input signal swings from ground to the positive supply rail.

新的放大器在信号通路上不会使用横向或衬底PNP，但是与NPN及PNP并行协作的输入端能够使输入信号的摆幅从0到正电源电压。

The quarantine signal of a ship is in the day time to fly a signal flag of international code,"Q"flag signifies that the ship is not infected, requesting the issuance of an entry pratique

昼间在明显处所悬挂国际通语信号旗："Q"字旗表示：本船没有染疫，请发给入境检疫证。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。