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  #1  
Old February 15th, 2012, 08:43 AM
Devon8822 Devon8822 is offline
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Default Negative Compression Ratio?

I have a compression plugin that allows you to go into the negatives for ratio... I dont really understand what this does? What can you use this for? thanks!
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Old February 15th, 2012, 08:58 AM
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Default Re: Negative Compression Ratio?

expansion?
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  #3  
Old February 15th, 2012, 12:58 PM
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Default Re: Negative Compression Ratio?

Inflation?





wait, that's the opposite of depression...

How about expansion?
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Old February 15th, 2012, 01:11 PM
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Default Re: Negative Compression Ratio?

Think of expansion as the opposite of compression. Basically it increases the dynamic range. Anything below the threshold gets it's volume decreased by whatever ratio you've got going on.
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Old February 15th, 2012, 02:51 PM
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Default Re: Negative Compression Ratio?

What plugin is it? Usually expansion in compressor plugins will be notated by a ratio of 0.1-0.99:1.
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Old February 15th, 2012, 06:17 PM
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Default Re: Negative Compression Ratio?

That shouldn't be expansion. Negative ratio means that above the threshold the level would actually decrease.
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Old February 15th, 2012, 06:57 PM
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Originally Posted by Jitters View Post
Think of expansion as the opposite of compression. Basically it increases the dynamic range. Anything below the threshold gets it's volume decreased by whatever ratio you've got going on.

You have both upwards (which can be useful to bring out low-level details without touching your peak dynamics) and downwards (what people refer to gates - a gate is a *hard* expander, with a ratio higher than say, 10:1).
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Old February 15th, 2012, 07:04 PM
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Originally Posted by meLoCo_go View Post
That shouldn't be expansion. Negative ratio means that above the threshold the level would actually decrease.
Maybe that's what it is on some novel and obscure (but correctly expressed) plugin.

I think maybe the Waves C1 refers to upwards expansion as negative *compression* ratio... :-(
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Old February 15th, 2012, 07:37 PM
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Default Re: Negative Compression Ratio?

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Originally Posted by Le chef View Post
Maybe that's what it is on some novel and obscure (but correctly expressed) plugin.

I think maybe the Waves C1 refers to upwards expansion as negative *compression* ratio... :-(
Nope the C1 refers to upward expansion as compression with ratios from 0.5:1 - 0.99:1 which makes sense. For example with 0.5:1, for every half dB above the threshold on input, you get a full dB of gain on the output.

Negative ratios are for what they call "cancellation mode", which can make signals on the output severely lower than on the input, even below the threshold. I have yet to find a situation that this is useful for.
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Old February 15th, 2012, 07:42 PM
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Default Re: Negative Compression Ratio?

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Originally Posted by meLoCo_go View Post
That shouldn't be expansion. Negative ratio means that above the threshold the level would actually decrease.
Exactly.
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Old February 16th, 2012, 07:42 AM
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Default Re: Negative Compression Ratio?

I'm sorry, did you guys mistake 0.1 - 0.99 as negative numbers?

As far as I can tell, they're still above 0...
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Old February 16th, 2012, 07:47 AM
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Default Re: Negative Compression Ratio?

Quote:
Originally Posted by meLoCo_go View Post
That shouldn't be expansion. Negative ratio means that above the threshold the level would actually decrease.
Right.

∞:1: no change in output level regardless of input.
Negative ratio: output decreases when input increases.
Positive ratio: output increases when input increases.

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Old February 16th, 2012, 06:16 PM
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Default Re: Negative Compression Ratio?

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Old February 16th, 2012, 08:06 PM
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Default Re: Negative Compression Ratio?

Ratios less than one (decimal) are for expansion IOW to increase dynamic range.

Or am I captain obvious?

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Old February 16th, 2012, 08:43 PM
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Default Re: Negative Compression Ratio?

The only time I've used negative ratios in a compressor is with a split-band de-esser on the most awful female VO's. BACK OFF THE MIC, BITCH!
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