前置放大器电子线路或装置，用来探测并加强无线电接收机所发出的微弱信号，从而使其达到更加有力的增幅程度。

An electronic circuit or device that detects and strengthens weak signals, as from a radio receiver, for subsequent, more powerful amplification stages.

youdao

文中充分利用了目标信号的频率、幅度和增幅速率这三个特征量，设计出具有幅度检测、增幅速率检测、带外干扰信号检测的信号处理器。

In this paper, a signal processor, which can measure frequency, amplitude and amplitude-increasing velocity, is contrived by making full use of these three characteristic parameters.

youdao

文中充分利用了目标信号的频率、幅度和增幅速率这三个特征量，设计出具有幅度检测、增幅速率检测、带外干扰信号检测的信号处理器。

In this paper, a signal processor, which can measure frequency, amplitude and amplitude-increasing velocity, is contrived by making full use of these three characteristic parameters.

youdao