为避免后续非线性处理引起正交信号的相位畸变，利用相位滤波技术(Phase Filter Technique，PFT)将包含有运动方向信息的两路正交解调多普勒管壁血流混合信号分解成两个正、反方向的单向混合信号。
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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.
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。
The binary phase-only filter (BPOF) digital watermarking is a semi-fragile watermarking technique used for the image credibility authentication.
二元纯位相滤波器(BPOF)数字水印是一种用于图像真实性认证的半脆弱水印技术。
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