在典型的通信系统中，调制过程是数字信号加载在载波的幅度值、载波的频率或者载波的相位上。
In the model communications system, the modulation process also is loaded the digital signal in the carrier scope value, the carrier frequency or on the carrier phase.
得出了啁啾幅度和啁啾相位与调制频率的关系。
Chirping amplitude and phase changes with the modulation frequency are present.
首先介绍从信号幅度、相位、频率及功率谱等特性中提取的三种特征参数，应用这三种参数采用人工神经网络对模拟调制信号进行了识别。
Three features parameters derived from the instantaneous amplitude, instantaneous phase, instantaneous frequency and power spectrum of analogue modulated signals are presented in this article.
连续相位调制由于其具有恒定包络幅度且对任意的调制信息序列能保持信号的相位连续，从而能够有效的改进信号的频谱特性。
The continuous phase modulation has the constant amplitude and its phase is continuous, which make the signal has a very good power spectrum.
调制的方法主要是通过改变正弦波的幅度、相位和频率来传送信息。
Modulation methods primarily through changes in the rate of sine wave, phase and frequency to transmit information.
相位调制与使用ASK(幅度键控)的CW相比有很多优点。
The phase modulation has some more advantages against CW, which USES ASK (amplitude shift keying).
模块中的相位累加器，使系统具有较高的频率分辨率，可实现快速频率切换，很容易实现频率、相位和幅度的数控调制，有广泛的应用价值。
The phase adder in the model is widely applied which could enable system to hold high frequency revolution, fast frequency switching, and easily digital modulating of the signal's phase and amplitude.
对三波道干涉仪测向结果不受幅度调制和频率调制（相位调制）的影响进行了数学分析。
We also analysed the influence of amplitude modulation and frequency (or phase ) modulation on Interferometer Direction Finder.
该方法用短时分析提取数字调制信号在幅度、频率和相位随时间变化的特征，并利用这些特征对各种数字调制信号进行识别。
The approach is to use short-time analysis to extract the characteristics of time-varying amplitude, frequency and phase in a digital modulation signal, and applies them for simple identification.
两个相位调制器的驱动信号幅度可减小一半，便可获得和用一个相位调制器方案相同的调制效果。
To obtain the same effect of using one phase modulator, the amplitude of the drivers on the two phase modulators can decrease to half of that in one phase modulator scheme.
正交相位和幅度调制QPAM ？
正交相位和幅度调制QPAM ？
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