High Pass Equiripple Filter 2.
High pass FIR filters with lenghts up to 135 can be derived with the applet below.
Scrollbars 0 to 68 are used to move the frequency extrema.
Scrollbars 69 and 70 set the number of extrema.
Scrollbars 72 and 74 set the pass band and stop band edges.
Scrollbars 76 and 77 set the ripple ratio and grid density.
Scrollbars 78 and 79 move the White and Blue frequency reference lines.
Scrollbars 80 and 81 set the dB/div and the dB of the dark red reference line.
Scrollbar 82 sets the error gain.
Images below show some of the possibilities. The first case is for small N which can be used to understand how the applet works.
In the case below, the transition bandwidth is 0.05ws and the stop band attenuation is greater than 103dB.
In the case below, the transition bandwidth is 0.03ws and the stop band attenuation is greater than 81dB.
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COPYRIGHT © 2008 Cuthbert Nyack.