【摘要】 本文提出了一种新的带双窗全相位数字滤波器频域结构,指出等价的FIR滤波器中的延迟窗是双窗全相位滤波器中前后窗的卷积,理论证明了无窗和单窗全相位滤波器均严格通过频率采样点,双窗全相位滤波器逼近频率采样点。实验表明加窗全相位滤波器不但具有较高的旁瓣衰减,而且基本消除了通带和阻带波动,特别适合于设计频率有间断特性的滤波器。更多还原

【Abstract】 According to a novel all phase digital filler with dual windows in frequency domain presented in some literature , the paper pointed out that the delay window in the equivalent FIR structure is the convolution of the dual win-dow. It proved theoretically that all phase digital filter with no window and single window can pass freguency samples strictly, all phase digital filter with dual window can approach frequency samples. Finally the experimental results indi-cated that ripples across the pass and stop band are almost eliminated in the all phase digital filter, which especially is used to design digital filters with discontinuous freguency characteristic.更多还原