... amplitude-frequency distribution 振幅频率分布 amplitude-frequency modulation 振幅频率调制 amplitude-frequency response 幅度频率响应 ...
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... amplitude-modulation code 调幅编码 amplitude ultrasonic modulation A型超声探测 amplitude frequency modulation 振幅频率调制 ...
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频率振幅调制完毕 frequency and amplitude modulated
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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。
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.
光辐射的调制是指改变光波振幅、强度、相位或频率、偏振等参数使之携带信息的过程。
Modulation of light refers to changing parameters of light wave such as amplitude, intensity, and phase, frequency, polarization, etc. to make it carry message.
用于无线电传输时，信号用载波传送，通过改变(调制)载波的振幅、频率或间隔来实现。
FOR radio transmission, inFORmation is imparted to a carrier wave by varying (modulating) its amplitude, frequency, or duration.
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