为了测量受噪声和谐波干扰的两个信号间的相位差，基于自适应带通滤波器(abf)和测量信道交换技术，提出了一种新的测量方法。
To measure phase accurately in the presence of harmonics for both noisy input signals, a technique based adaptive bandpass filter (ABF) and the method of interchanging signal channel is presented.
高频带通滤波器（几百 MHz）用于电 话中心局的信道选择。
High-frequency band-pass filters(several hundred MHz) are used for Channel selection in telephone central offices.
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