频率 的中文句子和英文句子

啸声干扰一种由于诸如闪电等大气干扰而产生的音频电磁波，具有典型的逐渐减弱频率的特征，该频减引起了检波设备中调逐渐下降的啸声

An electromagnetic wave of audio frequency produced by atmospheric disturbances such as lightning, having a characteristically decreasing frequency responsible for a whistling sound of descending pitch in detection equipment.


一个频带的上下界频率之差，单位用赫兹表示。

The difference, expressed in Hertz, between the two limiting frequencies of a band.


激光器使偶然的混杂频率的电磁辐射，变为一个或更多的高度强化和连续的紫外线、可见光或红外线辐射的分离频率仪器中的一种

Any of several devices that convert incident electromagnetic radiation of mixed frequencies to one or more discrete frequencies of highly amplified and coherent ultraviolet, visible, or infrared radiation.


低频扬声器设计用来再现低音频率的扬声器

A loudspeaker designed to reproduce bass frequencies.


鉴别器，鉴频器一种将输入信号的某一特征，如频率或相位转变为幅度变化装置，其变化大小因信号与标准或参考信号的不同程度而异

A device that converts a property of an input signal, such as frequency or phase, into an amplitude variation, depending on how the signal differs from a standard or reference signal.


他变换了无线电传送的频率。

He varied the transmission frequency.