The selection of filter is controlled by software, so that low-noise signal can be acquired in a wide frequency band.
由软件控制选择滤波器，这样可以在很宽的频带获得低噪声的信号。
High-frequency band-pass filters(several hundred MHz) are used for Channel selection in telephone central offices.
高频带通滤波器（几百 MHz）用于电 话中心局的信道选择。
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