Removing high pitched whine using audacity

hey i just wanted to take a few minutes and show some uh special audio editing you can do uh if you run into a problem with a high-pitched wine so um listen to this excerpt this is a radio lab podcast that i heard this morning we need lots of a whole screen of jazz hands right now let's go for it yeah okay so you can hear the speaker as the speaker is speaking there's like a really high pitched wine that goes right along with their voice um they've done some noise reduction um but so it's not really there in the silences but when he speaks uh you can hear that really really high-pitched whistle listen closely we need lots of a whole screen injection to me that's a really annoying sound so what we need to do is we need to figure out the frequency of this sound and we need to use that um that knowledge to suppress that frequency so what i'm going to do right now is i'm going to just take a little chunk of the speaker speaking and i'm going to do what's called a spectral analysis all right so i've selected this i'm using the selection tool here and what i'm going to do is i'm going to go into analyze this menu here and you can see that i can plot the spectrum here all right and now this is showing basically um the frequencies that are strongest in this selection here so this is probably to speak the fundamental the speaker's voice right you can see it's um it's the strongest and then you know the the pitches the frequencies are kind of varied through here and then we have this little bump here i'm going to guess that this bump is it um and if we look at the bump the frequencies it'll tell us the frequencies right down here where the cursor is or where the nearest peak is so the cursor here is you know in the 7 500 8 1 8 100 so what i'm going to do right now is i'm going to just check that frequency okay i'm going to guess that's 8 100 why don't i go to a frequency generator which is right here online tone generator and i'm going to look and i'm going to see if around 8 8 000 that that's about the same pitch let's listen to that wine again we need like we need okay um if i listen to that wine and put this all the way down at one percent the high pitches can get so loud just be really careful with these tone generators so um i'm going to start nice and low i'm going to play and then that sounds like it's about the same frequency in the same range so that sounds like a good candidate so let's take that um let's take that 7996 um right there in 72 to 79.96 so what i'm going to do is i'm going to take this i'm actually going to select the whole thing and duplicate it so we can compare easily so i can go here duplicate it's command d so let's do that command d and the same thing i'm going to actually duplicate it again and i'm going to name this i'm going to i'm going to work with this with the graphic eq all right and then this one i'm going to do some work on it with a notch filter alright so let's take a look at this graphic key this um and we're gonna we're going to edit this with a graphic eq and i'm gonna so i selected the second one here and i'm going to use this effect and it's the graphic eq and so if i flatten the graphic eq this will this won't change a single thing and now these are the frequencies at the top so the frequencies right around 8k i just want to really really uh suppress those so maybe a little bit around here suppress a little bit around 10k bring that down a bunch too let's listen to that and see if that sounds a little better we need lots of a whole screen of jazz hands right now let's go for it yeah yeah so that sounds to me like that wine is pretty much gone all right we can compare in a second here we go let's listen to the original we need lots of a whole painful line and then listen to this one we need lots of a whole screen it's probably when you've got a whole it's pretty much gone there um and one more thing uh let's try this now i'm gonna use what's called a notch filter a notch filter is another way you can suppress a certain range of frequencies so if i pick a notch filter and i put in roughly the frequency that's given this treble here which we decided was you know right in the 7900 so let's uh let's go to that notch filter now you can use a notch filter to get rid of a low hum or a high pitched wine so here we're using it to get rid of that high-pitched wine so i'm going to put that right around 8 000. okay and the higher value reduces the width 1.0 um what i actually i'm gonna decrease let's let's actually also do that we need lots of a whole screen of jazz hands right now let's go for it yeah that's actually that feels like it's pretty much gone to me so let's go ahead and apply that filter notch filter okay so now let's listen to it here we go we need lots of a whole screen injection yep that wine is all gone let's listen to the original again we need lots of a whole screen all right uh and just as a last little exercise let's just do that spectral analysis again here's the original okay you can see there's that that bump right there now this the graphic eq has probably smoothed that out let's do the same thing let's look at that you can see that it smoothed it right out there okay and then the notch filter is going to actually just kind of take a chunk out of it so let's look at that you can see the notch filter similarly to that but it actually took a real straight chunk right out around that 8 000 um so um and that is it that's a way you can reduce a high-pitched wine and the way you can use filters on audacity it's pretty powerful program

Channel: Russell Posegate

Views: 36,506

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Id: nVqjlM0yj7k

Length: 6min 15sec (375 seconds)

Published: Mon Sep 14 2020