Strange Waveform from LP Recording

Hi. I’ve been recording quite a few old LPs. Every once in a while I get this crazy waveform where the waveform itself seems to be written on a sine wave. I’ve looked all over, but I can’t find anything about this. I don’t even know if it’s really a problem that I need to worry about. I hope someone can tell me what’s up with this. Here is a picture of the thing…

It looks to me like vinyl surface noise or turntable rumble. It’s at about 8 Hz. You could get rid of it by applying a steep (48 db/octave) high-pass filter with a cutoff frequency of 20 Hz.
– Bill

Thank you, Bill! I’ll try that.

Wow. Ok, that really worked! Thank you very much!