"Modulation domain" is a plane domain which is consisted of frequency and time signal axes.

“调制域”是由信号的频率和时间两个轴构成的平面域。

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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.

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。

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Modulation Domain and Pulse Analyzer(MDPA) analyzes signal using a plane domain which is consisted of frequency and time.

调制域及脉冲分析仪利用时间和频率构成的平面域对信号进行分析。

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AM radio can be sent over larger distances, but the quality of the sound is not as good as a later kind of radio signal processing, called frequency modulation.

VOA: special.2010.12.08