Hey what's up, it's Wick for WickieMedia tutorials
and today we're going to take a look at filters.
The last episode we've looked at frequencies and today we're going to
look at how we're gonna change the frequency content of a signal.
A filter is being used to remove groups of frequencies from our signal.
When looking at filters there's different types of filters that we can run into.
The first filter i'm going to take a look at is a low cut filter,
or else called a High-Pass filter.
A High Pass filter let's through the high frequencies by cutting all the low frequencies.
This can be helpful when you just need to remove all whole bunch of low
frequencies from your signal,
and it can be really cool as an effect.
This is what it sounds like in the background music
So you could clearly hear where i had cut away all the low frequencies and where
I brought them back in.
The next filter i want to take a look at is a Low-pass or a high-cut filter,
which is exactly the opposite of what we have just heard.
A low-pass filter let's through the low frequencies of the signal by removing or
cutting the high frequencies.
So this is being used to remove the high frequencies and again it's pretty cool
as an effect.
so you now could really hear that the high frequencies were being cut away and that
we just had the low-part of the signal.
And than we've got a Band-cut filter.
This just removes a region, or a band, of frequencies.
Let's say we've got this really annoying frequency around four or five hundred Hertz
Than with a band-cut filter we can actually just remove that small
portion of frequencies in that area.
Then we also have a band-pass filter. which basically removes all the low frequencies
and the high frequencies from a point and keeps a band of frequencies in the middle.
And then we have a notch-filter. A notch filter is
basically a band-cut filter but then when a really narrow band
so it just affects a really small group of frequencies.
And then we have a comb-filter. A comb-filter is a series of really small
notch-filters in a row.
So they basically look like a comb.
So what are the functions that we can find on these filters?
Probably the most important is the 'frequency' parameter.
the frequency parameter allows us to set from where that the filter should work.
when we're working with a low-cut filter
the frequency parameter defines from where
below frequencies will be cut.
So the frequency is probably the first setting that we apply when we insert a filter.
Then we have the slope. The slope describes the attenuation of
frequencies per octave. Slopes normally go in steps of 6 dB.
so we can have a slope of 6 dB, that means for every octave
the attenuation will be six dB more.
if we use a slope of 24, that means for every octave
an attenuation of 24, so that's a much steeper slope.
So it basically means that it filters more and we will have more effect.
Most filters allow you to set the amount of attenuation per octave
but normally this is fixed in groups of six, so you can chose 6, 12, 18, 24, etc
when we're working with a band-pass or a band-cut filter
we usually have two frequency selections, that is for each side of the filter.
the next function is the resonance.
And the resonance is actually a small boost at the edges
of our frequency selection. And this actually enhances the sound of a
'sweep' when were making a filter-sweep through the spectrum.
I'm going to play this song with a high cut filter
and i'm going to 'swoosh' or 'sweep' through my frequencies
and i'm going to do that twice once without any resonance
and at the second i'm going to increase the resonance so you can hear the effect
So you could really hear that sharp edge when the resonance was increased
when you give that filter sweep
it's a lot more noticeable because you can really hear that sweeps so...
this is just covering the basics of what we're going to be looking at.
In the next tutorial i'm going to take a look at a practical session
i'm really getting use filters in the project and show you some more examples
and in the tutorial after that i'm going to talk about equalizers.
So I hope y'all enjoyed this tutorial, and I hope to see y'all soon for the next one.