Simple FIR Digital Filters The frequency (=0 at which 0(e0)= 0 0 is of practical interest since here the gang(Oc) in dB is given by G(Oc)=20log1o H(e/0c) 2010g10 (e70)-20log0y2全-3dB since the dc gain G(0)=201og. H(ej0)=o 7 10 Copyright C 2001, S K MitraCopyright © 2001, S. K. Mitra 7 Simple FIR Digital Filters • The frequency at which is of practical interest since here the gain in dB is given by since the dc gain w= wc ( ) 2 1 ( ) 0 0 0 j j H e H e c = w ( ) G wc 20log ( ) 20log10 2 3 dB 0 = 10 −  − j H e ( ) G wc 20log ( ) 10 c j H e w = 0 20 0 0 10 ( ) = log ( ) = j G H e