You can find two demo videos for airspy-fmradion FM broadcast multipath filter in this page.
Video license: ©2019 Kenji Rikitake. Videos in this page can be redistributed under Creative Commons CC-BY-NC-ND 4.0 License.
The first one describes airspy-fmradion FM multipath filter coefficient convergence, in polar complex values (for each 2000 blocks, long-term measurement of ~9.5 hours, based on the listening data of JOBK-FM NHK Osaka FM 88.1MHz), recorded August 2019 (video metadata).
The second one describes airspy-fmradion FM multipath filter coefficient convergence (stage ratio 3:1) in polar complex values (for each 1000 blocks, long-term measurement of ~12.1 hours, based on the listening data of JOBK-FM NHK Osaka FM 88.1MHz), recorded August 2019(video metadata).