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Topic: Limiting vs Compresion
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Posted On: Sep. 21 2008, 10:48 PM

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Hey guys.... I know this is a really dumb question for most of you but here it goes...

What is the difference among limiting and compresing ?

Thanks in advance !
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Skip to the previous post in this topic. Posted On: Sep. 21 2008, 11:52 PM

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Someone else may explain it better, but this is the way I think of it.
 Limiting sets a max. that cannot be exceeded - so, you can keep the sound from clipping, but it does not "level out" the sound. It is usually applied last, after compression.
Compression is a way of turning down the sound as it exceeds a threshold - the sound is turned down by a ration by how much it is over that threshold. With a ratio of 1:2 every 1db about the threshold the sound is turned down by 2 db.  Loud enough and it will still clip, but the sound is "leveled out."  The dynamics of the sound are effected adversly if too much compression is used.

Bax
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Skip to the previous post in this topic. Posted On: Sep. 22 2008, 2:05 AM

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Yeah--

Limiting will protect equipment and prevent clipping.

Compression, to oversimplify, is to make it sound more even.

Fuggle
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Skip to the previous post in this topic. Posted On: Sep. 22 2008, 2:09 AM

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Fuggie, you are going to have to learn to spand far more time on extra words. Your answeres are very short and make too much sense!
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Skip to the previous post in this topic. Posted On: Sep. 22 2008, 5:23 AM

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Thanks guys !

I agree with Bax, Fuggle put it really simple.

So far so good... now, Why does it happen that when I use limiting, my signal seems to be so much louder ? (or is it me just imagining it)
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Skip to the previous post in this topic. Posted On: Sep. 22 2008, 6:29 AM

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Hi, Gamma--You're probably not imagining it.

Maybe your program gets louder because of a low threshold setting? If you don't want it jumping up in volume, try decreasing the threshold.
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Skip to the previous post in this topic. Posted On: Sep. 22 2008, 7:11 AM

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(I can't edit the message, for some reason)...

Or, if you like the way it sounds and it's too loud, try reducing the output gain?

This stuff can make my head hurt...I don't understand why a signal gets louder with a low threshold and a ratio of greater than 1:1 when the output gain is unity.
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Skip to the previous post in this topic. Posted On: Sep. 22 2008, 8:02 AM

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I like to try find a level where the sound file looks like a "wave" file.  Compression, especally ones that can deal in the different sound pitches (Low, Mid range, and highs) can really bring the sound to the front, but it does not "Cut off" the sound, it squishes it, the sound is compressed.  You could think of it a denser sound, more sound energy.  Loud recordings have wave forms that are almost squared off, they hsve very little dynamic range, and the wave form looks like it.   The amount of sound energy (the volume level has beeen turned way up past where the sound would be completely distorted/clipped exce-pt the the compressor/limitor Hold them back like a dam holds large amounts of water - there is plenty of energy to move well past the dam, ut it holds it in place. The peaks and valleys are small - the sound stays loud because the softer sounds have been made louder and the louder sound squished into a space/sound range where they are as loud as they can get without clipping "Too" much.  Some clipping/distortion is done on purpose.
I await the shorted, clear version . . .
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Skip to the previous post in this topic. Posted On: Sep. 22 2008, 10:42 AM

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Skip to the previous post in this topic. Posted On: Sep. 22 2008, 1:56 PM
sevenOfeleven

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Limitting - is relative to the loudest parts of a source.
           So if you have a source with a -6db peak, and
           you set the 'limitter' to -3db, then only those
           -6db peaks are going to reach -3db, and the rest
           of the source material will be raised in amplitude
           accordingly. (proportionally)
Compression on the other hand (which can be used as a limiter also)
           can raise all of the source to the set limit by amplifying
           the lower source material disproportionally.
           i.e lower levels recieve more amplification.
           But there are many other things you can do with compression.
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