M_Glenn_M
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CJaysMusic
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Re:non symmetrical waves?
2012/06/30 15:45:23
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You have major DC Offset my friend
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M_Glenn_M
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Re:non symmetrical waves?
2012/06/30 16:13:06
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I wondered if that was it.
Isn't there a fix for that?
G
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Luteman
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Re:non symmetrical waves?
2012/06/30 16:22:00
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Preferences -> Audio -> 'Playback and Recording' and check 'Remove DC Offset During Record'
Chris
SONAR Platinum, Windows 7 Pro 64bit, Core2Quad Q6600, 8GB, 2 x SSD, M-Audio Fast Track Ultra, M-Audio Axiom 61, Behringer FCB1010 MIDI pedalboard, Stephen Haddock 8-course lute, some guitars, a mandolin and a bass
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FastBikerBoy
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Re:non symmetrical waves?
2012/06/30 16:40:18
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M_Glenn_M
I wondered if that was it.
Isn't there a fix for that?
G
In addition to Luteman's suggestion it can be done after the event by selecting Remove DC Offset found in the Main Menu-->Process-->Apply effect. You'll need to have the clip selected though.
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Chregg
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Re:non symmetrical waves?
2012/06/30 16:48:04
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no doubt the algorithm will be a high pass filter of sorts !!!
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M_Glenn_M
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Re:non symmetrical waves?
2012/06/30 17:10:45
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Thanks I'll give both ideas a try.
This is a simple bass line DI'd to my BR800 and USB to Sonar all in one.
What would make a crappy wave?
A crappy pickup? (It's a Fender Squire P-Bass)
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M_Glenn_M
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Re:non symmetrical waves?
2012/06/30 17:33:53
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Hmm.. neither the offset command nor recording with Remove DC offset enabled during record seem to make any perceivable difference to the wave form..
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Guitarhacker
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Re:non symmetrical waves?
2012/07/01 08:59:58
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even though you have non-symmetrical waves, the big question is.... Can you hear any sort of issue with that wave that makes you want to fix it?
I have noticed this on mine as well..... and I have the DC offset on..... to me it's not a big deal as long as it sounds good.
My website & music: www.herbhartley.com MC4/5/6/X1e.c, on a Custom DAW Focusrite Firewire Saffire Interface BMI/NSAI "Just as the blade chooses the warrior, so too, the song chooses the writer "
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M_Glenn_M
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Re:non symmetrical waves?
2012/07/01 09:47:27
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A good point.
It sounds as good raw as I'd expect from the equipment I guess.
It sounds acceptable once I added some icing.
Thanks.
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SCorey
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Re:non symmetrical waves?
2012/07/02 12:03:53
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Non-symmetrical waves does not necessarily mean there's DC offset. Many instruments produce non-symmetrical waves--anything in the brass family for example. If you run a DC offset remover, and the wave is still asymmetrical, then it's probably not a problem.
Sonar's "Analyst" plugin also has a DC meter. What does it say about it?
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M_Glenn_M
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Re:non symmetrical waves?
2012/07/02 13:29:45
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That's a new one to me. What a useful tool for EQ! Thanks.
I see a little "DC" in the bottom corner but what do I look for?
Does it do something when it's off DC?
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SToons
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Re:non symmetrical waves?
2012/07/03 00:23:01
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SCorey
Non-symmetrical waves does not necessarily mean there's DC offset.
+1. The picture does not look like it has DC offset, it's simply not a symmetrical waveform.
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M_Glenn_M
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Re:non symmetrical waves?
2012/07/03 00:46:35
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Thanks guys.
I'd still like to know how to recognize one if I saw or heard it.
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SToons
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Re:non symmetrical waves?
2012/07/03 01:25:45
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M_Glenn_M
Thanks guys.
I'd still like to know how to recognize one if I saw or heard it.
Not always easy to spot. If you saw a pure sine wave and the line did not go down the center equally that would be an example of DC offset. Take any wave file and introduce a DC offset and then compare it to the original. http://www.flickr.com/photos/81774270@N03/ Sine2 has the DC offset.
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M_Glenn_M
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Re:non symmetrical waves?
2012/07/03 11:12:07
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BretB
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Re:non symmetrical waves?
2012/07/03 15:53:35
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Try your bass thru a DI box or even direct (not thru your amp) and compare waveforms. That would point to an amp problem. I have never seen a waveform look like that.
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M_Glenn_M
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Re:non symmetrical waves?
2012/07/03 16:18:12
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This was direct to my BR800 digital recorder.
Maybe that's the prob.
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FastBikerBoy
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Re:non symmetrical waves?
2012/07/03 16:22:05
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I'm no expert on DC offset but I thought you could just record silence and see where the flat line lies. If it isn't dead centre of the wave clip then you have DC offset.
You don't need to record actual audio sound to see it. In fact it's probably easier to see a clip is silent.
That's what I've always thought anyway.
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The Maillard Reaction
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Re:non symmetrical waves?
2012/07/03 19:11:10
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Non symmetrical waveform illustrations indicate odd ordered harmonics are present in the overtones and dynamically linked to the timbre of the tone.
best regards,
mike
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Bub 
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Re:non symmetrical waves?
2012/07/03 21:48:41
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Does the Cakewalk Analyst show DC Offset? It has an indicator on it that is easy to miss on the very far right.
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SToons
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Re:non symmetrical waves?
2012/07/03 22:17:43
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FastBikerBoy
I'm no expert on DC offset but I thought you could just record silence and see where the flat line lies. If it isn't dead centre of the wave clip then you have DC offset.
You don't need to record actual audio sound to see it. In fact it's probably easier to see a clip is silent.
That's what I've always thought anyway.
If you record "pure" silence there will be no flat line. However almost every soundcard will have a noise floor and some inaudible hiss will be present if that's what you're referring to as a flat line. Zoom in fully on the amplitude axis and you will see if the noise floor is sitting along the baseline or not. That's still not a guaranteed method of finding DC offset.
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SToons
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Re:non symmetrical waves?
2012/07/03 22:19:38
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M_Glenn_M
This was direct to my BR800 digital recorder.
Maybe that's the prob.
You haven't fully established that there is in fact any problem! Waves do NOT have to, nor are they always supposed to, look symmetrical.
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M_Glenn_M
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Re:non symmetrical waves?
2012/07/04 01:07:41
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I now believe this is the case. I tried a few of the ideas and nothing showed up.
My assumption was a wave was symmetrical or something was wrong and now I know better.
Thanks Guys
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