I've recently updated my Postdetection Filter for HD Radio Signals writeup and the accompanying software. The writeup describes an active filter you can build to eliminate the noise HD Radio signals cause on stereo signals on many FM tuners. The software lets you customize the filter for your objectives and your particular tuner. You specify the maximum frequency response error and minimum stereo separation. An automatic optimizer then designs the filter. Another program lets you enter measured R and C values to check the characteristics of the filter as implemented. You can adjust any part until the response is satisfactory.
Postdetection Filter for HD Radio Signals
Brian
Postdetection Filter for HD Radio Signals
Brian