Digital Signal Processing 主讲：张君 上文大
Digital Signal Processing 主讲：张君
Characteristics of practical frequency-selective filters Digital Signal Processing--FIR Digital Filter Design IH(@)l 1+61 1-81 δ1~Passband ripple 82~Stopband ripple Passband ripple p~Passband edge frequency @Stopband edge frequency Stopband Transition 82 band Qp D π Figure 10.1.2 Magnitude characteristics of physically realizable filters. 上游充通大
Digital Signal Processing—— FIR Digital Filter Design Characteristics of practical frequency-selective filters
Digital Filter Design Digital Signal Processing--FIR Digital Filter Design The filter design problem is the problem of constructing the transfer function of a filter that meets prescribed frequency response specifications. FIR Filter *advantage linear phase property ·stability disadvantage ·long filter length most computation cost IIR Filter 上游充通大学
Digital Signal Processing—— FIR Digital Filter Design Digital Filter Design The filter design problem is the problem of constructing the transfer function of a filter that meets prescribed frequency response specifications. FIR Filter advantage • linear phase property • stability disadvantage • long filter length • most computation cost IIR Filter
Digital Filter Classification Digital Signal Processing--FIR Digital Filter Design A filter's structure is probably the most common method of Digital Filter classification. That is Infinite Impulse Response Digital Filter(IIR)and Finite Impulse Response Digital Filter(FIR): bz H(z)= r=0 1+ ∑a4zt k=1 H(z)= h(n)z n=0 上浒充通大￥
Digital Signal Processing—— FIR Digital Filter Design Digital Filter Classification A filter's structure is probably the most common method of Digital Filter classification. That is Infinite Impulse Response Digital Filter(IIR) and Finite Impulse Response Digital Filter (FIR) : 0 1 1 0 ( ) 1 ( ) ( ) M r r r N k k k N n n b z H z a z H z h n z
Ideal Filter Digital Signal Processing--FIR Digital Filter Design Lowpass H() -2π 一元 0 2π Highpass (e 0 -2元 一元 0 2w Bandpass H() -0 -2元 一元 0 2π Bandstop He -2元 一元 0 2元 Fig 10.1.1 ideal Lowpass Highpass,Bandpass Bandstop Magnitude Response 上游充通大学
Digital Signal Processing—— FIR Digital Filter Design Ideal Filter Fig 10.1.1 ideal Lowpass、Highpass、Bandpass、Bandstop Magnitude Response (e ) j H (e ) j H (e ) j H (e ) j H 0 Lowpass 0 Highpass 0 Bandpass 0 Bandstop 2π 2π 2π 2π ππππ π π π π 2π 2π 2π 2π