为实现采样率与陷波频率之间为非整数倍数关系下的线性相位梳状滤波器,提出了将高通纠漂滤波器与分数延迟滤波器相结合的设计方法,同时,采用多相滤波结构替代直接结构对基于分数延迟的有限冲激响应(FIR)型梳状滤波器进行实现,以降低其实现复杂度。通过这种方法得到的梳状滤波器在通带内具有线性相位,在陷波点上可基本保持高通滤波器的陷波特性。将该方法应用于有基线漂移、工频及其谐波干扰的心电信号的滤波处理,干扰得到消除。 In order to achieve a linear phase comb filter with a non-integer multiple between the sampling rate and the notch frequency, a design method of combining a high pass filter with a fractional delay filter is proposed. Meanwhile, a polyphase filter structure In addition to the direct structure, a finite impulse response (FIR) comb filter based on fractional delay is implemented to reduce its implementation complexity. The comb filter obtained by this method has a linear phase in the passband, and the notch characteristic of the high-pass filter can be basically maintained at the trap point. The method is applied to the filter processing of ECG with baseline drift, power frequency and its harmonic interference, and the interference is eliminated.