Explain me in easy way.
How input and output results will.
What it does?

 

Last edited: Oct 6, 2020

I checked on YouTube but confused

 

Have you already seen these?

https://audiosex.pro/threads/upward-downward-compression.55454/

https://audiosex.pro/threads/upward-downward-compression.55454/#post-503561

 

Yes

 

Oh, then it's going to be a bit difficult to explain, but I'll try.

With downward compression, which is the normal/usual way of compression, everything below the threshold remains unaltered, eveything above the threshold gets lowered and reduced in level means, it doesn't move as much up and down as before anymore.

As an example with fictional numbers: the threshold is set to 80, ratio is 4:1. A signal with level 90 (10 above threshold) will result in 82,5, one with level 100 (20 above threshold) in 85.
This is downward compression.

For upward compression all values below the threshold are raised, those above it remain the same. 90 remains 90, 100 remains 100.
For a ratio of 1:1,5 70 (10 below threshold) will result in 75, 60 (20 below threshold) will result in 70.

Downward compression compresses and lowers the peaks, upward compression raises the low levels and RMS.

 

How about this?

 

You just squeeze some gain region of the sound from the lowest gain up to some knee point where the squeezing stops, or you squeeze the highest gain region of the sound from some lower knee point up to the end, choosing the ratio of squeezing in the chosen region.

 

In case you need a refresher on understanding compression with a visual tool, check this out!

Good luck.

 

I think upward compression is a TERRIBLE term.
I think it ought to be referred to as EXPANSION.
But what do I know. Maybe there is a reason for using the term "upward compression".
Not to hijack the thread, but does anyone know WHY the term is used?
(and explaining MAY also partly answer the OP question)
- EDIT: OMG, not to confuse the issue but ...

Spoiler

... in looking at iZotope's site regarding compression they have a poor choice of terms (the word "spectrum") in describing upward and downward ...especially considering multiband dynamics ...

"To quickly recap, in what we commonly call “compression,” a signal is brought down in level when it crosses a dialed-in threshold. More accurately, this is termed “downward compression.”

"Upward compression, however, works from the opposite end of the spectrum: when a quiet signal falls below a predetermined threshold, it’s brought up in level."

SPECTRUM? Maybe because they work with audio that term came to mind but it is a BAD choice.
They could have said "works in the opposite way". For anyone who actually needs to read their description, "spectrum" might be misleading.

Maybe I am a rebel in terminology but I feel iZotope's description is wrong.

https://www.izotope.com/en/learn/ex...d-techniques-for-improving-dynamic-range.html

I feel that "downward expansion" is compression, and upward compression is expansion, and I feel that to use the terms in another way is just pandering to the retards.
Welp... maybe i am just arrogant in my ignorance...

TO ME compression is always..well, COMPRESSION of dynamic range.
And TO ME expansion is always ... well, EXPANSION of dynamic range.

I refuse to submit!!

 

Last edited: Oct 7, 2020

First time I heard the word “expansion” was in my preferite record shop: I was wondering why the vinyls I listened to in the shop sounded better than when I played them at home. The seller was my friend: he confessed to me that, in order to sell more records, they had installed a "compressor / expander" module on the output of their mixer. Since that day my life has never been the same… and from there on I have always called the upward compressor an "expander"

 

Absolutely impossible.

Seriously, could be fictional maths, I'll give you that. Where are the weisenheimers when you need them?

 

And this is exactly why there is a difference between upward compression and expansion.
Upward compression reduces the dynamic range (technically this term is wrong is this context) below the threshold, while upward expansion expands the dynamic range above the threshold.

 

Quoted my post of an approximate explanation:

1. Downward compression - loud parts compressed, below threshold is untounched. Usual compression, limiting, maximizing.
2. Upward compression - loud parts untouched, below threshold is louder. No punch, no groove. Vocals' breath and background noise can be louder. Imagine that you still have a dry recorded sound, but noise is louder, background stuff is louder, more reverb tails, but still no punch and groove.
3. Upward expansion - add punch, snap and transients to sound, uncompress the compressed sound.
4. Downward expansion - lower the noise below threshold, smooth gating or extreme gating. Lower the quieter sound, less background sounds, less reverb tails.

You can add background quiet sounds by downward compression (compress and gain/make up) or upward compression, but you decide how to do this. Both methods will lead to different results.

Simple description.

 

the best way is to search an explicit frequency and cancel it out first .
then you can lift it or cancel it as whish.

 

Hahahaha... upward compression is a quite a annoying term. Totally agree.Think about an Twin TurboCompressor Nissan GTR vs an Twin Turbo Downward Expander Nissan GTR!! LoL. physically, matter can be compressed, expanded or maintained in its natural equilibrium with its environment. What happens furthermore is based on how you will apply these forces.

 

Last edited: Oct 7, 2020

Thank you for easy and short explanation.
I did Screenshot .

 

No,no,no… this process we are talking about here is not expansion! Expansion works the opposite way of regular downward compression. In expansion, the level differences between transients are increased which results in an increased or expanded dynamic range. That's what the term expansion actually refers to: increasing/expanding the dynamic range.

Think of a stem with a hihat and a snare. Let's say the hihat on that track is too loud in relation to the snare. With a downward expander you could set it up in a way that the hihat is turned down, but the snare stays at the same level which results in a increased dynamic range. Exactly as in the graphic shown in izotope Link you are refering too.

But this is NOT what happens in Upward compression discussed here, because – and that's the core of the argument – the dynamic range is decreased by using up- and downward compression, NOT increased/expanded. Everybody listening to a drumloop treated by MV2 can tell: this is not increasing the dynamic range. ;)

So everything you said is technically and in actual fact, wrong – no matter how you feel about it.

 

As I'd hoped, it seems clearer with specific rebuttals.
So, ok, so I can understand the need to use 4 terms, but my annoyance with those terms lingers...
Yeah, my feelz is wrong