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active filter 有源滤波器由有源电路器件,通常为运算放大器,及电阻器、电容器构成的电子滤波器。与无源滤波器相比,有源滤波器更接近于理想滤波器。algorithm 算法用有限步数求解某一问题的规则的集合。alias frequency 混叠频率以不够高的采样率对原数据数宇化,在重建的模拟数据中出现的低频成分。ambient level 背景电平被测试设备未工作时测试地点存在的信号和噪声值。amplitude modulation 幅度调制按给定的规律改变载波幅度的过程。
active filter An active filter consists of an active circuit device, usually an operational amplifier, and resistors and capacitors. Active filters are closer to ideal filters than passive filters. algorithm A collection of rules that solve a problem with a finite number of steps. alias frequency Aliasing frequency The number of original data at an insufficiently high sampling rate, the low frequency components that appear in the reconstructed analog data. ambient level Signal level and noise level present at the test site when the test equipment is not in operation. amplitude modulation Amplitude modulation changes the carrier amplitude according to a given law.