Simple FIR Digital Filters Highpass FIR Digital Filters The simplest highpass Fir filter is obtained from the simplest lowpass Fir filter by replacing z with -Z This results in H1(z)=1(1--) Copyright C 2001, S K. MitraCopyright © 2001, S. K. Mitra 13 Simple FIR Digital Filters Highpass FIR Digital Filters • The simplest highpass FIR filter is obtained from the simplest lowpass FIR filter by replacing z with • This results in ( ) ( ) 1 2 1 1 1 − H z = − z − z