amplitude-frequency modulation的意思|示意

First, the generation mechanism, components and frequency characteristic of radiated noise of naval ships are studied. There exists periodical modulation for the amplitude of propeller noise.

首先讨论了舰船辐射噪声的产生机理、构成和频率特性，指出螺旋桨噪声的振幅存在周期性调制。

Because of stepless frequency modulation and amplitude modulation and operating with facility, hydraulic vibrators are being used widely in a lot of engineering machines.

液压激振器由于具有无级调频、调幅和操作方便等优点而在许多工程机械中得到广泛应用。

Chirping amplitude and phase changes with the modulation frequency are present.

得出了啁啾幅度和啁啾相位与调制频率的关系。

Under the same amplitude modulation index and same frequency modulation index, different SVM waveforms can be derived from different sampling point distributions.

相同频率调制比和幅度调制比的情况下，对调制波信号的不同采样点分布可以得到不同的SVM波形。

This paper analyses the frequency characteristics of the gear meshing and the signals due to amplitude and frequency modulation.

本文分析了齿轮传动的频率特性和它所产生的频率和幅值调制信号。

This modulation include either amplitude modulation or frequency(phase) modulation.

包括幅值调制和频率（相位）调制两部分。