dynamic range control This is a topic that many people are looking for. bluevelvetrestaurant.com is a channel providing useful information about learning, life, digital marketing and online courses …. it will help you have an overview and solid multi-faceted knowledge . Today, bluevelvetrestaurant.com would like to introduce to you What s dynamic range compression? (AKIO TV). Following along are instructions in the video below:
“I say compression you might think of data compression. Which is the kind of compression compression where you have some information and you want to store it in a more way so that it takes up less space on a disk or a memory card in a computer. But today. That s not the kind of compression.
We re going to talk about today. We re going to talk about something called dynamic range compression. Which is an audio processing technique. That is used a lot in all kinds of different things.
Including this video. Let s start off by taking a look at an audio track that i have recorded to be more specific the audio track of the intro of this video. So here s what it looks like okay on the vertical axis. We ve got intensity amplitude and on the horizontal axis.
We ve got time what you ll immediately notice about this audio track is that throughout it the intensity changes a lot there are all kinds of peaks and valleys. It s not a constant loudness and that makes sense because a person speaking the intensity changes all the time in that situation. And it s not just with people speaking. It s also with music and any kind of sound.
We record the intensity is constantly changing. And there is a term for that and it s called dynamic range dynamic range is the term that is used to describe the difference between the biggest peak and the lowest valley in an audio recording so it s a difference between the loudest and the quietest parts of the recording now this recording since it came straight from the microphone and hasn t been modified or processed at all it has maximum dynamic range. There is quite a big difference between the largest peaks and the lowest valleys. As you can see now sometimes.
This is exactly what you want in some situations. You might want to have a lot of dynamic range. But most of the time you do not want a lot of dynamic range and then you use compression compression is a tool that you can use to reduce the dynamic range of audio and before we take a look at how this tool works. Let s see why you would want to do this so right now.
I have turned off all of the compression on this video. So you re listening to my voice without any dynamic range compression. And you can hear it sounds different it sounds sharper maybe. Even kind of annoying at some point.
When i say letter s. For example when i say an s. It sounds quite sharp and loud and in in these kinds of videos. It doesn t even matter much because i m not talking very loudly.
I m not shouting into the microphone etc. But imagine. This was a tv show or a radio show and there was some more people in this room. And we were chatting about all kinds of things and maybe someone starts.
Laughing or maybe someone screams into their microphone. You get all these loud sounds. That would be very annoying to listen to like you get a shock in your ears. If somebody starts laughing very loudly and this is when you use dynamic range compression.
This is why when making videos and radio shows people use compressors to limit the dynamic range of bits of it it s more pleasant to listen to so how is it done well in order to demonstrate that let s actually go onto the computer. And i ll show you how it works so right here. I ve got the audio track from the intro of this video and as you can see because there are all these these peaks. This hasn t been compressed yet so we re now going to apply the compression to this track so i start off by selecting the track going to effect and clicking a compressor that ll open up this window.
And that window allows us to apply the settings for our compressor. The first setting you ll encounter is the threshold. The threshold determines. The level at which the compressor starts working.
So currently. It s set a minus 25. Db. Meaning.
That the compressor will be applied to anything that is louder than minus 25 db. And this happens to be a nice setting for my audio recordings. The noise floor doesn t really matter for now the next important setting is the ratio. The ratio determines how strong the compressor is so we can see what the ratio does in this graph up here okay.
In this graph. This horizontal axis represents. The input signal. So this is the level of the signal that comes into the compressor and this represents the level of the signal.
When it has come out of the compressor when the compression has been applied to it so you can now see that at minus 25. If the compressor starts working and anything louder than 25 gets compressed. It gets made quieter by the compressor you can see that because the line gets less steep. But by increasing this ratio.
We make the compressor stronger. We make this line become flatter and flatter and so the way this ratio. Works is two to one means that when the signal. The original signal goes to db over the threshold.
It s reduced to being one db over the threshold. If i set it to six to one for example it means that when the signal goes. 6. Db over the thresholds it reduced it s reduced to 1 db over the threshold.
So the higher this first number is the stronger the compression becomes eventually if it says infinity to 1. What we ve made is a flat line so anything above minus 25. Just becomes minus 25 regardless of how loud it used to be in which case. We wouldn t call it a compressor.
We would then call it a limiter for now. I m going to set it to 2 to 1. Because that ratio fits my videos. Pretty well then we ve also got attack and release time.
And it means exactly what you think they mean this refers to how much time it takes for the compressor to start acting and stop acting so with this setting it takes nor point 10 seconds for the compressor to start working. When the signal goes over minus 25 db. So when this audio track goes over minus 25. It takes naught point 10 seconds for the compressor to start working and start doing its work and after that it takes a second for the compressor to stop working.
I ve set them to the lowest possible values. Because i hate the sound of a long attack and release time finally there is this button right here. Which says make up gain for 0 db. After compressing which refers to normalizing the signal.
So what this does is after it s compressed all of the louder bits down and made the dynamic range smaller it ll then stretch out the entire signal to normalize it to 0 db. But that s usually that usually causes a loss of quality. So i do not take that box then i can simply click ok. It ll then apply the compression and as you can see that graph looks a lot flatter now so as you can see dynamic range compression is very easy to do and that s also why it s used a lot and sometimes.
It s used inappropriately. Because you should be very careful about when you use dynamic range compression and also about how much dynamic range compression you use on speech for example. If you use a load of it. If you use a ton of compression.
It starts to sound annoying on its own. Because you hear the level changing all the time it starts to become very obvious and then you might as well have uncompressed audio. Because that s less annoying to listen to than overly compressed audio. But on music.
It s especially tricky in music you can use compression in an appropriate way. However. It s very easy to ruin music by using too much compression a lot of music that comes out in our days. Has a lot of dynamic range compression in it.
And that makes it sound pretty unnatural in music for some elements. Dynamic. Range is incredibly important. Especially for things.
Like drums and other percussion instruments. And in those cases. It can be a big mistake to use too much dynamic range compression. I m not saying we shouldn t use any compression at all in music.
But i am saying you should be very careful if you re ever use mixing music or whatever. And you decide to use dynamic range compression be very careful because it s easy to screw up it s really really easy to screw up anyway. That s what dynamic range compression is that s how it s used i hope you ve enjoyed this video. ” .
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