discriminator

詳細解釋：

dis.crim.i.na.tor

n.（名詞）
One that discriminates.
鑑別者，辨別者
Electronics 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.
【電子學】 鑑別器，鑒頻器：一種將輸入信號的某一特徵，如頻率或相位轉變為幅度變化裝置，其變化大小因信號與標準或參考信號的不同程度而異