A plastic bottle hitting a metal cover. Wave, 44. 1khz, 24bit, stereorecording device: zoom h2n with xy-capsulelow-cut: yes (80hz)normalized to -1dbfs. Location: leuphana universität lüneburg, parking deck. Date: 2013-12-10, 16:00hrecorded and edited by: christoph weberthis recording was created in the framework of the seminar "soundscape leuphana (ws13/14)".
Removed the hum from cognito-perceptu's pill-bottle-4 sample. Original sample had truck in background in addition to some low frequency hum. Used the remove hum feature on izotope rx2 and, presto-chango, no distracting background noise. Now there is still a high frequency hum which i did not touch. I think this could be mitigated with a low pass filter in eq if you choose.