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afterdawn.com > forums > digital audio > audio > clipping of eac rips
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Clipping of EAC rips
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marren
Newbie
_ 		22. February 2004 @ 15:42 _ Link to this message    Send private message to this user   
Hi!
I have a problem with EAC. When I rip a cd it seems that the peak level becomes about +1 to +.5 dB resulting in several samples clipping. I wonder if anyone has the same problem and if they've found a solution.
cheers
Marren
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tigre
Moderator
_ 		23. February 2004 @ 02:53 _ Link to this message    Send private message to this user   
What format are you ripping/encoding to?
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AFTERDAWN FORUM RULES: http://forums.afterdawn.com/thread_view.cfm/2487
marren
Newbie
_ 		23. February 2004 @ 03:05 _ Link to this message    Send private message to this user   
Mostly to wav for burning, in some cases mp3 using external LAME encoder v3.95.1 and the --alt-standard preset. I'm a bit confused since from what I've read clipping shouldn't be a problem when ripping to wav.
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This message has been edited since posting. Last time this message was edited on 23. February 2004 @ 03:08
tigre
Moderator
_ 		23. February 2004 @ 12:34 _ Link to this message    Send private message to this user   
I asked about the format because lossy formats like mp3 can cause clipping on decoding of tracks that haven't clipped before. To deal with this you can use replaygain/mp3gain.
http://replaygain.hydrogenaudio.org

Something similar can happen if you use an equalizer (or other DSPs). Even if you only lower some bands and leave the other at 0 position, clipping can happen.

I'm not completely sure what you're talking about, though:
CD audio (16 bit PCM) can contain sample values between -32768 and +32767. Clipping would mean sample values out of this range - but these can't be stored on CD ... ;)
[nitpicking mode: off]
OTH many recent Pop/Rock CDs are mastered too loud using e.g. dynamics compression and also amplification to levels that introduce clipping (= sample values that would be out of +/-32767/8 range after amplification but are truncated to +/-32767/8).
Depending on what program you've used to analyse your rips, peak levels > 0 are normal. For these programs peak level doesn't mean minimum/maximum sample value but they use some algorithm to judge perceived loudness. In this case "several samples clipping" would mean that there are more than 2 samples in a row with minimum or maximum sample value. As said above this is a sign of clipping that has happend during mastering, not during ripping. Another intersting link about this:
http://loudnessrace.net
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marren
Newbie
_ 		24. February 2004 @ 00:11 _ Link to this message    Send private message to this user   
Ok that might be it. Thanks for your help.
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