Hi Sheila,
Here's a video tutorial on YouTube that's explained at a nice pace with
examples.
https://www.youtube.com/watch?v=01EB6W0HZuk
Basically, you want to identify the offending frequency using Analyze +
Spectrum Analysis, then use the Notch Filter effect to "notch out" that
frequency (reduce it significantly).
So if you have a hum at 60 Hz, you could enter 60 as the frequency and use 4
for Q (as the video suggests). If it did not reduce a wide enough "notch" or
affected too large a notch, try different Q values. Use Analyze + Spectrum
Analysis after you run the effect to see the difference. If you see other
"peaks" in the frequency analysis, they may be harmonics of the hum -- try
reducing them in the same way.
Hope that helps!
Steve
________________________________
From: studiorecorder-bounce@xxxxxxxxxxxxx <studiorecorder-bounce@xxxxxxxxxxxxx>
on behalf of Sheila Winther <Sheila.Winther@xxxxxxxxxxxxxxxxxxx>
Sent: Tuesday, December 13, 2016 9:43 AM
To: studiorecorder@xxxxxxxxxxxxx
Subject: [studiorecorder] Re: noise reduction
Steve, I see the notch filter, but I really don’t understand what it does or
how to use it. Any good tutorials out there that you know of? As you can
tell, I’m not an engineer. :)
Sheila Winther
Volunteer Services Coordinator/Recording Studio Manager
Idaho Commission for Libraries
325 West State Street
Boise, Idaho 83702
208-334-2150
www.libraries.idaho.gov<http://www.libraries.idaho.gov>
[http://libraries.idaho.gov/sites/all/themes/idahoTemplate/showcase.jpg]<http://www.libraries.idaho.gov/>
Idaho Commission for Libraries | Building the capacity of
...<http://www.libraries.idaho.gov/>
www.libraries.idaho.gov
Idaho Commission for Libraries Address: 325 W State St., Boise, ID 83702 Phone:
(208) 334-2150 | In-State Toll Free: (800) 458-3271 Printed from the Idaho
Commission ...
From: studiorecorder-bounce@xxxxxxxxxxxxx
[mailto:studiorecorder-bounce@xxxxxxxxxxxxx] On Behalf Of Steven Tate
Sent: Monday, December 12, 2016 2:07 PM
To: studiorecorder@xxxxxxxxxxxxx
Subject: [studiorecorder] Re: noise reduction
Sheila,
You could also try the notch filter in Audacity.
Steve
________________________________
From:
studiorecorder-bounce@xxxxxxxxxxxxx<mailto:studiorecorder-bounce@xxxxxxxxxxxxx>
<studiorecorder-bounce@xxxxxxxxxxxxx<mailto:studiorecorder-bounce@xxxxxxxxxxxxx>>
on behalf of Sheila Winther
<Sheila.Winther@xxxxxxxxxxxxxxxxxxx<mailto:Sheila.Winther@xxxxxxxxxxxxxxxxxxx>>
Sent: Monday, December 12, 2016 2:35 PM
To: studiorecorder@xxxxxxxxxxxxx<mailto:studiorecorder@xxxxxxxxxxxxx>
Subject: [studiorecorder] Re: noise reduction
Thanks Neal,
No, these tones were mixed into the analog recording from a little tone
generator. And this tone generator did a double tone, so I can just delete the
first tone between chapters, but the second one is mixed into the first
sentence of audio. I think Jayson is on the right track with the high pass
filter. I’ll let you know.
Sheila Winther
Volunteer Services Coordinator/Recording Studio Manager
Idaho Commission for Libraries
325 West State Street
Boise, Idaho 83702
208-334-2150
www.libraries.idaho.gov<http://www.libraries.idaho.gov>
[http://libraries.idaho.gov/sites/all/themes/idahoTemplate/showcase.jpg]<http://www.libraries.idaho.gov/>
Idaho Commission for Libraries | Building the capacity of
...<http://www.libraries.idaho.gov/>
www.libraries.idaho.gov<http://www.libraries.idaho.gov>
Idaho Commission for Libraries Address: 325 W State St., Boise, ID 83702 Phone:
(208) 334-2150 | In-State Toll Free: (800) 458-3271 Printed from the Idaho
Commission ...
From:
studiorecorder-bounce@xxxxxxxxxxxxx<mailto:studiorecorder-bounce@xxxxxxxxxxxxx>
[mailto:studiorecorder-bounce@xxxxxxxxxxxxx] On Behalf Of Neal Ewers
Sent: Monday, December 12, 2016 12:18 PM
To: studiorecorder@xxxxxxxxxxxxx<mailto:studiorecorder@xxxxxxxxxxxxx>
Subject: [studiorecorder] Re: noise reduction
Hi Sheila. In Sound Forge, I can pick a particular frequency to minus. I wonder
if you can do that in audacity? If you’re talking about the tones that Studio
Recorder puts in, I can try to see if I have any luck removing them. If you’re
talking about other tones, perhaps you could send me an example.
Thanks.
Neal
From:
studiorecorder-bounce@xxxxxxxxxxxxx<mailto:studiorecorder-bounce@xxxxxxxxxxxxx>
[mailto:studiorecorder-bounce@xxxxxxxxxxxxx] On Behalf Of Sheila Winther
Sent: Monday, December 12, 2016 12:33 PM
To: studiorecorder@xxxxxxxxxxxxx<mailto:studiorecorder@xxxxxxxxxxxxx>
Subject: [studiorecorder] noise reduction
We are converting our analog talking books to digital. The analog recordings
have tone indexing mixed into the audio. Has anyone found a good way to remove
the low frequency tone without destroying the voice audio? I use Audacity
noise reduction for background tape hiss, but if I change the values of the
noise reduction enough to effect the tone, it really makes the rest of the
audio sound over processed. Any help will be much appreciated.
Sheila Winther
Volunteer Services Coordinator/Recording Studio Manager
Idaho Commission for Libraries
325 West State Street
Boise, Idaho 83702
208-334-2150
www.libraries.idaho.gov<http://www.libraries.idaho.gov>
