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Gear / Technical Help => Ask The Tapers => Topic started by: down2earthlandscaper on December 24, 2018, 12:12:28 AM

Title: Strange looking wave forms?
Post by: down2earthlandscaper on December 24, 2018, 12:12:28 AM

These screenshots are of 4 songs from the first set of this show. Two of the waveforms look normal and the other two look strange (like a comb, so is this comb filtering?)  Curious because the mic positioning didn't change at all between songs, nor any of the settings on anything. Why would some songs seem "normal" and others have the weird "comb" look?

Here is the show for reference in case any anomalies can be heard as well as seen on the waveforms.

https://archive.org/details/Clinton.Fearon.2018-12-09.AKGc568eb.mixpre6.flac24

Title: Re: Strange looking wave forms?
Post by: morst on December 24, 2018, 02:38:43 AM

Comb filtering is something you might be able to see on a spectrum analyzer graph of amplitude vs frequency, but not these "amplitude vs time" charts.


I'm checking the tracks, and I think the spikes you are seeing are called Loud Kick Drum.

Title: Re: Strange looking wave forms?
Post by: chk on December 24, 2018, 08:25:41 AM

It’s just differences in the music. Those look totally normal.  Probably some combination of the bass and drum beat. I believe if you had an issue with comb filtering it would probably be a consistent issue on the recording (provided the mics and/or sound source didn’t change positions) and you wouldn’t see it on a wave form that is zoomed out to the degree those are.

Title: Re: Strange looking wave forms?
Post by: opsopcopolis on December 24, 2018, 09:31:01 AM

As others have said, that's totally normal. Just regular peaks in the music

Title: Re: Strange looking wave forms?
Post by: down2earthlandscaper on December 24, 2018, 01:14:01 PM

Thanks everybody.

Title: Re: Strange looking wave forms?
Post by: u2_fly_2 on March 18, 2019, 01:18:42 PM

Yes, just a change of "beat" in the songs...more drums.