KVR Audio

chagzuki · Post by **chagzuki** » Mon Sep 27, 2004 12:08 pm

I notice that a track from In Sides by Orbital has just over a 0.1% DC offset. Is this a negligible amount? Is there an agreed standard?

Stupid American Pig · Mon Sep 27, 2004 12:11 pm

I would say the less the better is a good standard?

C00kie · Post by **C00kie** » Mon Sep 27, 2004 12:20 pm

I doubt the figure. How do you measure that? Averaged on the whole track? Try to look for a silent piece (in a fade in or fade out) and zoom in on the vertical axis. There you can see for yourself weather it really has a DC offset.

It could be the result of a base kick where the first half cycle is louder than the rest. I wouldn't worry, seems neglectable. Why do you worry? Gonna chop it up and remix? Only then it will make a difference. As long as you play the complete track its OK.

In numeric terms, a DC offset of 0.1% in 16 bits sampling would mean the track is offset by the number 32. That is a -54dB click at the beginning & end.

chagzuki · Post by **chagzuki** » Mon Sep 27, 2004 12:31 pm

Yes, average.

I'm just curious.

chagzuki · Post by **chagzuki** » Mon Sep 27, 2004 12:35 pm

So using a 'remove DC offset' function based on the average level for the track can actually create a DC offset for silent passages.

C00kie · Post by **C00kie** » Mon Sep 27, 2004 12:38 pm

You got it

stefancrs · Post by **stefancrs** » Mon Sep 27, 2004 12:43 pm

Using a highpass filter won't though.

CypherOne · Post by **CypherOne** » Mon Sep 27, 2004 12:46 pm

what's a DC Offset?

mauseoleum · Post by **mauseoleum** » Mon Sep 27, 2004 12:50 pm

http://www.koen.smartelectronix.com/KTAudioHealer/

cutie.

griels · Post by **griels** » Mon Sep 27, 2004 12:51 pm

stefancrs wrote:Using a highpass filter won't though.

Yeah, I tend to just do lots of low cut below about 30hz. I'm not sure this is the best solution. The question is, where and how steep should that filter be? I think filtering might also affect phase information (don't quote me though).

donkey tugger · Post by **donkey tugger** » Mon Sep 27, 2004 1:05 pm

CypherOne wrote:what's a DC Offset?

I think she used to be married to Paul Weller.

CypherOne · Post by **CypherOne** » Mon Sep 27, 2004 1:07 pm

donkey tugger wrote:
CypherOne wrote:what's a DC Offset?
I think she used to be married to Paul Weller.

thanks for clearing that up. actually having just googled for the answer I can safely say I really don't want to know, I lost the will to live half way thru the first paragraph

griels · Post by **griels** » Mon Sep 27, 2004 1:07 pm

donkey tugger wrote:
CypherOne wrote:what's a DC Offset?
I think she used to be married to Paul Weller.

Ah.. Another spouse he brushed under the carpet, can't find a picture of her either

DC offset - what level is acceptable for a track?