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。
According to a novel all phase digital filter 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 eonvolution of the dual window. It proved theoretically that all phase digital filter with no window and single window can pass frequency samples striefly, all phase digital filter with dual window earl approach frequeney samples. Finally the experimental results indieated that ripples across the pass and stop band are almost eliminated in the all phase digital filter, whieh especially is used to design digital filters with discontinuous frequeney eharacteristic.
出处
《电子测量与仪器学报》
CSCD
2006年第1期98-103,共6页
Journal of Electronic Measurement and Instrumentation
基金
"天津大学教育振兴计划基金"资助项目
关键词
全相位数字滤波器
频率采样点
通带和阻带波动
all phase digital filter, frequency samples, ripples across the pass and stop band.