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#261522 - 04/13/09 07:27 AM
Re: Normalizing audio
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Senior Member
Registered: 07/21/05
Posts: 5387
Loc: English Riviera, UK
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Hi Nedim
If normalising is so bad, why is it that virtually every piece of hardware and software that processes audio (Including professional (Expensive) equipment) includes normalising as standard, and makes it as easy to access as possible? (It’s also usually the first item that pops up when you use any of the Process Wizards in software and/or hardware)
Also as far as I am aware, it does not alter anything, but just moves everything up to a higher level, and so is pretty neutral.
Curious
Bill
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English Riviera: Live entertainment, Real Ale, Great Scenery, Great Beaches, why would anyone want to live anywhere else (I�m definitely staying put).
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#261524 - 04/13/09 09:54 AM
Re: Normalizing audio
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Senior Member
Registered: 05/13/08
Posts: 1144
Loc: Staten Island, NYC
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Abacus, it does alter everything, there is a great deal of difference between Normilizing and Maximizing/Limiting. For Normalize to work properly the audio material has to be pretty even since normilizing brings everything up, the picks and the noise while maximizing is a whole different procedure, lets not bring up details about it cuz its a way complex and lost topic, it took me 4 years of college to understand just a little of it. Normalizing exist everywhere but its still the last resource to be used if you have nothing else to use. Any process alters audio, even maximizing/limiting but it all deppends on how they alter it. When i was at college (Audio Engineering, Mixing/Mastering) the engineers/teachers always tought us to try to avoid as much as we can, some reasons i understood some i didnt, its complex. There is also a lot of mathematics involved in it too, as what Compression does vs Limiting or what Normalizing does vs Maximizing and e tc. An example: A Maximizer brings up the low level and the high level together to a point you define and wont let it peak, it will crush it down while Normalizing will bring everything up, Noise, LowLevel and also Peak which will go way over 0db while a Compressor can raise the low level and crush the high level and on the other hand the Limiter wont just let the sound go after a point you define. A Limiter is basically a compressor, nothing else, just with infinite Ratio. And they dont do only that, they can do other things too, deppends on settings.
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#261525 - 04/13/09 10:35 AM
Re: Normalizing audio
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Senior Member
Registered: 03/24/08
Posts: 1099
Loc: Myrtle beach SC
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It has been my understanding Normalizing is a glorified Volume control. The Waves L1 and L2 do a much better job although tey reduce the Dynamic range of the material and can be overdone real easy. But today that doesn't seem to matter. L O U D limited Dynamic range is the rule. LOL The important thing is to make all the tracks the same levels and relatively same EQ. The Waves Maximizer Stuff and a little program called T-Racks are good programs which do well for home use. Today's software goes a long way to doing what years ago could ONLY be done by a mastering engineer. For most homegrown "sell at the gig" CDs it's good enough. If you have a commercial release you will or should have the budget to hire a respected Mastering engineer. Not some guy who advertises in the back of Recording magazine who has T-Racks and Waves Listen to these samples to understand what even a home SW Mastering progam can accomplish http://www.ikmultimedia.com/t-racks/audiodemo/ Print this and study it... http://www.soundonsound.com/sos/aug04/articles/computermastering.htm [This message has been edited by Kingfrog (edited 04-13-2009).]
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#261526 - 04/13/09 12:20 PM
Re: Normalizing audio
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Member
Registered: 03/20/01
Posts: 847
Loc: Nashvville TN
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If you use peak normalization rather than RMS normalization, all you are doing is just bringing up everything equally. Just like turning up the volume. If you use RMS normalization, you're actually changing the dynamics of the original source. Here is an explanation from a list I'm on, though he's talking about orchestral music, the ideas still apply.
I'm back. I just thought I should have probably better explained the difference between peak and RMS levels. As I said, the peak is the highest single level in a file. But due to the potentially transient nature of peaks, they can be quite misleading. For instance, You may have a piece wherein the highest relative peak is actually something like -4 dB. But, and here's where it gets tricky. At the end of your symphonic piece you may have a crescendo which ends with a burst of sound from the entire orchestra. So that and only that one single peak time may hit 0 or close to it. Analyzing this can reveal what you have to do; compress or limit that peak to get a more realistic read on the file. So let's say you compress just that last measure down to a -2 dB peak. Now you've got 2 dB more headroom to work with. This in turn gives you 2 dB more of the perceived volume (RMS) you can raise before the compressor kicks in to protect against overloads. And as long as it's not too severe, you won't get the perception of squashed dynamics.
In other words, you can look at the stat's of two files, both having a peak of 0 dB. But one having an RMS of -21 and the other having an RMS of -18 dB. So if done right, you can have your cake and eat it too.
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