[Audacity-users] high-pitched noise in recording

Discussion:

bob cavanaugh

2010-10-29 22:52:17 UTC

High all, I just did a recording of a radio station the other day. After I
ran the truncate silence effect, I thought that everything would be fine.
However, I sometimes the audio cuts out, usually in a commercial. And a sort
of high-pitched noise is heard for a few seconds. Is there any way I can get
rid of this or is it something that I need to live with until I delete the
files in question? Also, during commercials, the person talking's voice
seems to be sped up at some parts of the commercial.

g***@audacityteam.org

2010-10-30 02:36:46 UTC

Permalink

On Fri, 29 Oct 2010 15:52:17 -0700

High all, I just did a recording of a radio station the other day... a sort
of high-pitched noise is heard for a few seconds. Is there any way I can get
rid of this

Try selecting the few seconds that has the noise, and Analyze > Plot
Spectrum. If you could see the spectrum this would hopefully show you
a spike towards the right (high frequency) side of the plot where the
audio was much louder at that frequency than either side of it.

Then you would use Notch Filter (extra plug-in) or Effect > Nyquist
Prompt to filter out the frequency where the spike was. You can read
more about this and download Notch Filter here:
http://wiki.audacityteam.org/wiki/Noise_Removal#Other_Techniques

Since you can't I assume see the spectrum plot, export it using the
"Export" button, open it in a text editor, then look for a frequency on
the left where the level on the right has much smaller negative numbers
than the values above or below it in the list. For example, this:

10766.601563 -41.084888
10852.734375 -27.513941
10938.867188 -8.378978
11025.000000 -5.945557
11111.132813 -16.059376
11197.265625 -36.729332
11283.398438 -45.824223
11369.531250 -50.926151

indicates a frequency centred on about 11000 Hz that is much louder
than other audio in surrounding frequencies. So filter out 11000 Hz in
that case.

After I ran the truncate silence effect, I thought that everything would
be fine. However, I sometimes the audio cuts out, usually in a
commercial... Also, during commercials, the person talking's voice
seems to be sped up at some parts of the commercial.

bob cavanaugh

2010-10-30 17:36:12 UTC

Permalink

Ok, I understood what you were saying about the truncate silence thing,
maybe I'll try that next time I do this. The high-pitched noise I'm not sure
I followed you on. What is happening is the audio is cutting out, and being
replaced for a few seconds with a high-pitched sort of noise. This usually
happens during a commercial, and after listening to about half of the files
I made with this recording, it has happened twice.

-----Original Message-----
From: ***@audacityteam.org [mailto:***@audacityteam.org]
Sent: Friday, October 29, 2010 7:37 PM
To: Discussion list for Audacity users
Subject: Re: [Audacity-users] high-pitched noise in recording

On Fri, 29 Oct 2010 15:52:17 -0700

High all, I just did a recording of a radio station the other day... a sort
of high-pitched noise is heard for a few seconds. Is there any way I can get
rid of this

Al Dimond

2010-10-30 21:07:09 UTC

Permalink

Was the high-pitched noise in the recording before you applied
Truncate Silence, or was it added by Truncate Silence? If it was added
by Truncate Silence, I'd be interested in knowing more about it. In
particular, a sample of the original recording in an affected section,
and the settings you used for the Truncate Silence effect.

Thanks,
Al

Post by bob cavanaugh
-----Original Message-----
Sent: Friday, October 29, 2010 7:37 PM
To: Discussion list for Audacity users
Subject: Re: [Audacity-users] high-pitched noise in recording
On Fri, 29 Oct 2010 15:52:17 -0700

Post by bob cavanaugh
High all, I just did a recording of a radio station the other
day... a

sort

Post by bob cavanaugh
of high-pitched noise is heard for a few seconds. Is there any
way I can

get

Post by bob cavanaugh
rid of this

Try selecting the few seconds that has the noise, and Analyze >
Plot Spectrum. If you could see the spectrum this would hopefully
show you a spike towards the right (high frequency) side of the
plot where the audio was much louder at that frequency than either
side of it.
Then you would use Notch Filter (extra plug-in) or Effect > Nyquist
Prompt to filter out the frequency where the spike was. You can
http://wiki.audacityteam.org/wiki/Noise_Removal#Other_Techniques
Since you can't I assume see the spectrum plot, export it using the
"Export" button, open it in a text editor, then look for a
frequency on the left where the level on the right has much
smaller negative numbers than the values above or below it in the
10766.601563 -41.084888
10852.734375 -27.513941
10938.867188 -8.378978
11025.000000 -5.945557
11111.132813 -16.059376
11197.265625 -36.729332
11283.398438 -45.824223
11369.531250 -50.926151
indicates a frequency centred on about 11000 Hz that is much louder
than other audio in surrounding frequencies. So filter out 11000 Hz
in that case.

Post by bob cavanaugh
After I ran the truncate silence effect, I thought that
everything would be fine. However, I sometimes the audio cuts
out, usually in a commercial... Also, during commercials, the
person talking's voice seems to be sped up at some parts of the
commercial.

Was it recorded like this or a result of Truncate Silence? If a
result of Truncate Silence, increase the "Min silence duration",
reduce the compression factor if "Max silence duration" exceeds
"Min silence duration", and/or make the "Threshold for silence" a
larger negative number (such as -60 dB instead of -40 dB). More
http://manual.audacityteam.org/index.php?title=Truncate_Silence
Gale
-------------------------------------------------------------------
--------- --
Nokia and AT&T present the 2010 Calling All Innovators-North
America contest Create new apps & games for the Nokia N8 for
consumers in U.S. and Canada $10 million total in prizes - $4M
cash, 500 devices, nearly $6M in marketing Develop with Nokia Qt
SDK, Web Runtime, or Java and Publish to Ovi Store
http://p.sf.net/sfu/nokia-dev2dev
*********** ASKING FOR HELP *************
When asking for help on this list, please include the following
information, so we can
* What operating system you are using (for example, Windows XP or
Mac OS X 10.5.1)
* Exactly what three digit version number of Audacity you are using
(Help > About
Audacity, or Audacity > About Audacity on a Mac computer)
* If this is a recording problem, what equipment you are recording
with, and how is it
connected to the computer?
https://lists.sourceforge.net/lists/listinfo/audacity-users
-------------------------------------------------------------------
----------- Nokia and AT&T present the 2010 Calling All
Innovators-North America contest Create new apps & games for the
Nokia N8 for consumers in U.S. and Canada $10 million total in
prizes - $4M cash, 500 devices, nearly $6M in marketing Develop
with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store
http://p.sf.net/sfu/nokia-dev2dev
*********** ASKING FOR HELP *************
When asking for help on this list, please include the following
* What operating system you are using (for example, Windows XP or
Mac OS X 10.5.1)
* Exactly what three digit version number of Audacity you are using
(Help > About Audacity, or Audacity > About Audacity on a Mac
computer)
* If this is a recording problem, what equipment you are recording
with, and how is it connected to the computer?
https://lists.sourceforge.net/lists/listinfo/audacity-users

Dave

2010-10-31 11:50:43 UTC

Permalink

Hi
how load is the commercial as compared the signal , just a thought ?? or do
you let the signal clip badly.
THANKYOU DAVE-211

----- Original Message -----
From: "bob cavanaugh" <***@comcast.net>
To: <audacity-***@lists.sourceforge.net>
Sent: Sunday, October 31, 2010 4:36 AM
Subject: Re: [Audacity-users] high-pitched noise in recording

Post by bob cavanaugh
Ok, I understood what you were saying about the truncate silence thing,
maybe I'll try that next time I do this. The high-pitched noise I'm not sure
I followed you on. What is happening is the audio is cutting out, and being
replaced for a few seconds with a high-pitched sort of noise. This usually
happens during a commercial, and after listening to about half of the files
I made with this recording, it has happened twice.
-----Original Message-----
Sent: Friday, October 29, 2010 7:37 PM
To: Discussion list for Audacity users
Subject: Re: [Audacity-users] high-pitched noise in recording
On Fri, 29 Oct 2010 15:52:17 -0700

High all, I just did a recording of a radio station the other day... a

sort

of high-pitched noise is heard for a few seconds. Is there any way I can

get

rid of this

Try selecting the few seconds that has the noise, and Analyze > Plot
Spectrum. If you could see the spectrum this would hopefully show you
a spike towards the right (high frequency) side of the plot where the
audio was much louder at that frequency than either side of it.
Then you would use Notch Filter (extra plug-in) or Effect > Nyquist
Prompt to filter out the frequency where the spike was. You can read
http://wiki.audacityteam.org/wiki/Noise_Removal#Other_Techniques
Since you can't I assume see the spectrum plot, export it using the
"Export" button, open it in a text editor, then look for a frequency on
the left where the level on the right has much smaller negative numbers
10766.601563 -41.084888
10852.734375 -27.513941
10938.867188 -8.378978
11025.000000 -5.945557
11111.132813 -16.059376
11197.265625 -36.729332
11283.398438 -45.824223
11369.531250 -50.926151
indicates a frequency centred on about 11000 Hz that is much louder
than other audio in surrounding frequencies. So filter out 11000 Hz in
that case.

Was it recorded like this or a result of Truncate Silence? If a result of
Truncate Silence, increase the "Min silence duration", reduce the
compression factor if "Max silence duration" exceeds "Min silence
duration", and/or make the "Threshold for silence" a larger negative
http://manual.audacityteam.org/index.php?title=Truncate_Silence
Gale
----------------------------------------------------------------------------
--
Nokia and AT&T present the 2010 Calling All Innovators-North America contest
Create new apps & games for the Nokia N8 for consumers in U.S. and Canada
$10 million total in prizes - $4M cash, 500 devices, nearly $6M in marketing
Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store
http://p.sf.net/sfu/nokia-dev2dev
*********** ASKING FOR HELP *************
When asking for help on this list, please include the following information,
so we can
* What operating system you are using (for example, Windows XP or Mac OS X
10.5.1)
* Exactly what three digit version number of Audacity you are using (Help
About
Audacity, or Audacity > About Audacity on a Mac computer)
* If this is a recording problem, what equipment you are recording with, and
how is it
connected to the computer?
https://lists.sourceforge.net/lists/listinfo/audacity-users
------------------------------------------------------------------------------
Nokia and AT&T present the 2010 Calling All Innovators-North America contest
Create new apps & games for the Nokia N8 for consumers in U.S. and Canada
$10 million total in prizes - $4M cash, 500 devices, nearly $6M in marketing
Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store
http://p.sf.net/sfu/nokia-dev2dev
*********** ASKING FOR HELP *************
When asking for help on this list, please include the following
information, so we can
* What operating system you are using (for example, Windows XP or Mac OS X
10.5.1)
* Exactly what three digit version number of Audacity you are using (Help

About

Audacity, or Audacity > About Audacity on a Mac computer)
* If this is a recording problem, what equipment you are recording with,
and how is it
connected to the computer?
https://lists.sourceforge.net/lists/listinfo/audacity-users

bob cavanaugh

2010-10-31 19:44:31 UTC

Permalink

What?

-----Original Message-----
From: Dave [mailto:***@bigpond.net.au]
Sent: Sunday, October 31, 2010 4:51 AM
To: Discussion list for Audacity users
Subject: Re: [Audacity-users] high-pitched noise in recording

Hi
how load is the commercial as compared the signal , just a thought ?? or do

you let the signal clip badly.
THANKYOU DAVE-211

----- Original Message -----
From: "bob cavanaugh" <***@comcast.net>
To: <audacity-***@lists.sourceforge.net>
Sent: Sunday, October 31, 2010 4:36 AM
Subject: Re: [Audacity-users] high-pitched noise in recording

High all, I just did a recording of a radio station the other day... a

sort

of high-pitched noise is heard for a few seconds. Is there any way I can

get

rid of this

Try selecting the few seconds that has the noise, and Analyze > Plot
Spectrum. If you could see the spectrum this would hopefully show you
a spike towards the right (high frequency) side of the plot where the
audio was much louder at that frequency than either side of it.
Then you would use Notch Filter (extra plug-in) or Effect > Nyquist
Prompt to filter out the frequency where the spike was. You can read
http://wiki.audacityteam.org/wiki/Noise_Removal#Other_Techniques
Since you can't I assume see the spectrum plot, export it using the
"Export" button, open it in a text editor, then look for a frequency on
the left where the level on the right has much smaller negative numbers
10766.601563 -41.084888
10852.734375 -27.513941
10938.867188 -8.378978
11025.000000 -5.945557
11111.132813 -16.059376
11197.265625 -36.729332
11283.398438 -45.824223
11369.531250 -50.926151
indicates a frequency centred on about 11000 Hz that is much louder
than other audio in surrounding frequencies. So filter out 11000 Hz in
that case.

----------------------------------------------------------------------------

Post by bob cavanaugh
--
Nokia and AT&T present the 2010 Calling All Innovators-North America contest
Create new apps & games for the Nokia N8 for consumers in U.S. and Canada
$10 million total in prizes - $4M cash, 500 devices, nearly $6M in marketing
Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store
http://p.sf.net/sfu/nokia-dev2dev
*********** ASKING FOR HELP *************
When asking for help on this list, please include the following information,
so we can
* What operating system you are using (for example, Windows XP or Mac OS X
10.5.1)
* Exactly what three digit version number of Audacity you are using (Help
About
Audacity, or Audacity > About Audacity on a Mac computer)
* If this is a recording problem, what equipment you are recording with, and
how is it
connected to the computer?
https://lists.sourceforge.net/lists/listinfo/audacity-users

----------------------------------------------------------------------------
--

Post by bob cavanaugh
Nokia and AT&T present the 2010 Calling All Innovators-North America contest
Create new apps & games for the Nokia N8 for consumers in U.S. and Canada
$10 million total in prizes - $4M cash, 500 devices, nearly $6M in marketing
Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store
http://p.sf.net/sfu/nokia-dev2dev
*********** ASKING FOR HELP *************
When asking for help on this list, please include the following
information, so we can
* What operating system you are using (for example, Windows XP or Mac OS X
10.5.1)
* Exactly what three digit version number of Audacity you are using (Help

About

g***@audacityteam.org

2010-10-31 23:13:56 UTC

Permalink

On Sat, 30 Oct 2010 10:36:12 -0700

... The high-pitched noise I'm not sure I followed you on. What is happening
is the audio is cutting out, and being replaced for a few seconds with a
high-pitched sort of noise. This usually happens during a commercial,
and after listening to about half of the files I made with this recording, it
has happened twice.

The instructions I gave about Notch Filter assumed the transmission
was affected by high-pitched interference that overlaid the "signal"
(the commercial) and of course that you recorded it like this.

If it sounds like the audio is being replaced with the noise, this might
still be because the noise is louder than the signal, so could be filtered
out. The sort of noise you are describing would usually not have a wide
frequency range, so the least damaging way to remove it would be to
find its frequency using Plot Spectrum, then notch filter that frequency.

If the audio really is being replaced with the high frequency noise, so
that you would have silence if you removed the noise, then clearly the
best way to remove it is to delete it, but you would have to do it
manually. Unless obscene words in the ads are being bleeped out by
the broadcasters, I would think it more likely that the interference is
laid on top of the ads.

If you want someone's opinion, you would have to upload an example
MP3 somewhere a few seconds long, containing the noise and the ad
either side of the noise. Then post the address the MP3 can be
downloaded from.

Gale

-----Original Message-----
Sent: Friday, October 29, 2010 7:37 PM
To: Discussion list for Audacity users
Subject: Re: [Audacity-users] high-pitched noise in recording
On Fri, 29 Oct 2010 15:52:17 -0700

High all, I just did a recording of a radio station the other day... a

sort

of high-pitched noise is heard for a few seconds. Is there any way I can

get

rid of this

Try selecting the few seconds that has the noise, and Analyze > Plot
Spectrum. If you could see the spectrum this would hopefully show you
a spike towards the right (high frequency) side of the plot where the
audio was much louder at that frequency than either side of it.
Then you would use Notch Filter (extra plug-in) or Effect > Nyquist
Prompt to filter out the frequency where the spike was. You can read
http://wiki.audacityteam.org/wiki/Noise_Removal#Other_Techniques
Since you can't I assume see the spectrum plot, export it using the
"Export" button, open it in a text editor, then look for a frequency on
the left where the level on the right has much smaller negative numbers
10766.601563 -41.084888
10852.734375 -27.513941
10938.867188 -8.378978
11025.000000 -5.945557
11111.132813 -16.059376
11197.265625 -36.729332
11283.398438 -45.824223
11369.531250 -50.926151
indicates a frequency centred on about 11000 Hz that is much louder
than other audio in surrounding frequencies. So filter out 11000 Hz in
that case.

bob cavanaugh

2010-11-01 00:54:14 UTC

Permalink

I just uploaded a segment of audio. This one was interesting in that it
spanned two different comercials. http://q-audio.net/i/8282

-----Original Message-----
From: ***@audacityteam.org [mailto:***@audacityteam.org]
Sent: Sunday, October 31, 2010 4:14 PM
To: audacity-***@lists.sourceforge.net
Subject: Re: [Audacity-users] high-pitched noise in recording

On Sat, 30 Oct 2010 10:36:12 -0700

High all, I just did a recording of a radio station the other day... a

sort

of high-pitched noise is heard for a few seconds. Is there any way I can

get

rid of this

Try selecting the few seconds that has the noise, and Analyze > Plot
Spectrum. If you could see the spectrum this would hopefully show you
a spike towards the right (high frequency) side of the plot where the
audio was much louder at that frequency than either side of it.
Then you would use Notch Filter (extra plug-in) or Effect > Nyquist
Prompt to filter out the frequency where the spike was. You can read
http://wiki.audacityteam.org/wiki/Noise_Removal#Other_Techniques
Since you can't I assume see the spectrum plot, export it using the
"Export" button, open it in a text editor, then look for a frequency on
the left where the level on the right has much smaller negative numbers
10766.601563 -41.084888
10852.734375 -27.513941
10938.867188 -8.378978
11025.000000 -5.945557
11111.132813 -16.059376
11197.265625 -36.729332
11283.398438 -45.824223
11369.531250 -50.926151
indicates a frequency centred on about 11000 Hz that is much louder
than other audio in surrounding frequencies. So filter out 11000 Hz in
that case.

Allistair Bywater

2010-11-01 10:20:42 UTC

Permalink

Hi Bob,

I found only a fundamental at 2750 Hz which nearly corresponds to F7 on the
keyboard (3-and-a-bit octaves above middle-C). [2793.83 is the correct
frequency for that F-note]

Also, 2nd, 3rd, 4th, 5th, and 6th harmonics. There was no trace of any other
frequencies which indicated that the noise replaced the commercials.

As an experiment, I chopped out the noise and the commercial *seemed* to
sound as if the it was paused during the 11 or so seconds the noise was
received.

I have had a very similar problems with sound recorded off YouTube and the
BBC website, only without the noise, just silence - at least, it *sounded*
like silence. Deleting the "silences" restored the audio, as with the
commercial mentioned above.

Maybe it's just what the net was sending you? Or an artifact of buffering
somewhere?

Kind Regards

Allistair
***@gmail.com

----- Original Message -----
From: "bob cavanaugh" <***@comcast.net>
To: <audacity-***@lists.sourceforge.net>
Sent: 01 November 2010 00:54
Subject: Re: [Audacity-users] high-pitched noise in recording

Post by bob cavanaugh
I just uploaded a segment of audio. This one was interesting in that it
spanned two different comercials. http://q-audio.net/i/8282
-----Original Message-----
Sent: Sunday, October 31, 2010 4:14 PM
Subject: Re: [Audacity-users] high-pitched noise in recording
On Sat, 30 Oct 2010 10:36:12 -0700

... The high-pitched noise I'm not sure I followed you on. What is

happening

is the audio is cutting out, and being replaced for a few seconds with a
high-pitched sort of noise. This usually happens during a commercial,
and after listening to about half of the files I made with this
recording,

has happened twice.

The instructions I gave about Notch Filter assumed the transmission
was affected by high-pitched interference that overlaid the "signal"
(the commercial) and of course that you recorded it like this.
If it sounds like the audio is being replaced with the noise, this might
still be because the noise is louder than the signal, so could be filtered
out. The sort of noise you are describing would usually not have a wide
frequency range, so the least damaging way to remove it would be to
find its frequency using Plot Spectrum, then notch filter that frequency.
If the audio really is being replaced with the high frequency noise, so
that you would have silence if you removed the noise, then clearly the
best way to remove it is to delete it, but you would have to do it
manually. Unless obscene words in the ads are being bleeped out by
the broadcasters, I would think it more likely that the interference is
laid on top of the ads.
If you want someone's opinion, you would have to upload an example
MP3 somewhere a few seconds long, containing the noise and the ad
either side of the noise. Then post the address the MP3 can be
downloaded from.
Gale

High all, I just did a recording of a radio station the other day... a

sort

of high-pitched noise is heard for a few seconds. Is there any way I can

get

rid of this

Try selecting the few seconds that has the noise, and Analyze > Plot
Spectrum. If you could see the spectrum this would hopefully show you
a spike towards the right (high frequency) side of the plot where the
audio was much louder at that frequency than either side of it.
Then you would use Notch Filter (extra plug-in) or Effect > Nyquist
Prompt to filter out the frequency where the spike was. You can read
http://wiki.audacityteam.org/wiki/Noise_Removal#Other_Techniques
Since you can't I assume see the spectrum plot, export it using the
"Export" button, open it in a text editor, then look for a frequency on
the left where the level on the right has much smaller negative numbers
10766.601563 -41.084888
10852.734375 -27.513941
10938.867188 -8.378978
11025.000000 -5.945557
11111.132813 -16.059376
11197.265625 -36.729332
11283.398438 -45.824223
11369.531250 -50.926151
indicates a frequency centred on about 11000 Hz that is much louder
than other audio in surrounding frequencies. So filter out 11000 Hz in
that case.

----------------------------------------------------------------------------
--
Nokia and AT&T present the 2010 Calling All Innovators-North America contest
Create new apps & games for the Nokia N8 for consumers in U.S. and Canada
$10 million total in prizes - $4M cash, 500 devices, nearly $6M in marketing
Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store
http://p.sf.net/sfu/nokia-dev2dev
*********** ASKING FOR HELP *************
When asking for help on this list, please include the following information,
so we can
* What operating system you are using (for example, Windows XP or Mac OS X
10.5.1)
* Exactly what three digit version number of Audacity you are using (Help
About
Audacity, or Audacity > About Audacity on a Mac computer)
* If this is a recording problem, what equipment you are recording with, and
how is it
connected to the computer?
https://lists.sourceforge.net/lists/listinfo/audacity-users
------------------------------------------------------------------------------
Nokia and AT&T present the 2010 Calling All Innovators-North America contest
Create new apps & games for the Nokia N8 for consumers in U.S. and Canada
$10 million total in prizes - $4M cash, 500 devices, nearly $6M in marketing
Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store
http://p.sf.net/sfu/nokia-dev2dev
*********** ASKING FOR HELP *************
When asking for help on this list, please include the following
information, so we can
* What operating system you are using (for example, Windows XP or Mac OS X
10.5.1)
* Exactly what three digit version number of Audacity you are using (Help

About

bob cavanaugh

2010-11-01 22:22:08 UTC

Permalink

So what you are saying is that if you edit out the noise you are able to get
the rest of the commercial back or does it just start from where it comes
back in? This is really curious though, because I was right there listening
to the audio as it was being recorded and it didn't seem to do that.

-----Original Message-----
From: Allistair Bywater [mailto:***@gmail.com]
Sent: Monday, November 01, 2010 3:21 AM
To: Discussion list for Audacity users
Subject: Re: [Audacity-users] high-pitched noise in recording

Hi Bob,

I found only a fundamental at 2750 Hz which nearly corresponds to F7 on the
keyboard (3-and-a-bit octaves above middle-C). [2793.83 is the correct
frequency for that F-note]

Also, 2nd, 3rd, 4th, 5th, and 6th harmonics. There was no trace of any other

frequencies which indicated that the noise replaced the commercials.

As an experiment, I chopped out the noise and the commercial *seemed* to
sound as if the it was paused during the 11 or so seconds the noise was
received.

I have had a very similar problems with sound recorded off YouTube and the
BBC website, only without the noise, just silence - at least, it *sounded*
like silence. Deleting the "silences" restored the audio, as with the
commercial mentioned above.

Maybe it's just what the net was sending you? Or an artifact of buffering
somewhere?

Kind Regards

Allistair
***@gmail.com

----- Original Message -----
From: "bob cavanaugh" <***@comcast.net>
To: <audacity-***@lists.sourceforge.net>
Sent: 01 November 2010 00:54
Subject: Re: [Audacity-users] high-pitched noise in recording

... The high-pitched noise I'm not sure I followed you on. What is

happening

has happened twice.

The instructions I gave about Notch Filter assumed the transmission
was affected by high-pitched interference that overlaid the "signal"
(the commercial) and of course that you recorded it like this.
If it sounds like the audio is being replaced with the noise, this might
still be because the noise is louder than the signal, so could be filtered
out. The sort of noise you are describing would usually not have a wide
frequency range, so the least damaging way to remove it would be to
find its frequency using Plot Spectrum, then notch filter that frequency.
If the audio really is being replaced with the high frequency noise, so
that you would have silence if you removed the noise, then clearly the
best way to remove it is to delete it, but you would have to do it
manually. Unless obscene words in the ads are being bleeped out by
the broadcasters, I would think it more likely that the interference is
laid on top of the ads.
If you want someone's opinion, you would have to upload an example
MP3 somewhere a few seconds long, containing the noise and the ad
either side of the noise. Then post the address the MP3 can be
downloaded from.
Gale

High all, I just did a recording of a radio station the other day... a

sort

of high-pitched noise is heard for a few seconds. Is there any way I can

get

rid of this

Try selecting the few seconds that has the noise, and Analyze > Plot
Spectrum. If you could see the spectrum this would hopefully show you
a spike towards the right (high frequency) side of the plot where the
audio was much louder at that frequency than either side of it.
Then you would use Notch Filter (extra plug-in) or Effect > Nyquist
Prompt to filter out the frequency where the spike was. You can read
http://wiki.audacityteam.org/wiki/Noise_Removal#Other_Techniques
Since you can't I assume see the spectrum plot, export it using the
"Export" button, open it in a text editor, then look for a frequency on
the left where the level on the right has much smaller negative numbers
10766.601563 -41.084888
10852.734375 -27.513941
10938.867188 -8.378978
11025.000000 -5.945557
11111.132813 -16.059376
11197.265625 -36.729332
11283.398438 -45.824223
11369.531250 -50.926151
indicates a frequency centred on about 11000 Hz that is much louder
than other audio in surrounding frequencies. So filter out 11000 Hz in
that case.

----------------------------------------------------------------------------

----------------------------------------------------------------------------
--

About

Allistair Bywater

2010-11-01 22:33:11 UTC

Permalink

Hi,

Yes, it really seemed to carry on - at least in the sample you posted... but
maybe it was only co-incidental. Try it on the sample and see what you
think.

However, I would try just editing out those other moments and see what it
sounds like, you can always undo...

Kind Regards

Allistair
***@gmail.com

----- Original Message -----
From: "bob cavanaugh" <***@comcast.net>
To: "'Allistair Bywater'" <***@gmail.com>; "'Discussion list for
Audacity users'" <audacity-***@lists.sourceforge.net>
Sent: 01 November 2010 22:22
Subject: RE: [Audacity-users] high-pitched noise in recording

Post by bob cavanaugh
So what you are saying is that if you edit out the noise you are able to get
the rest of the commercial back or does it just start from where it comes
back in? This is really curious though, because I was right there listening
to the audio as it was being recorded and it didn't seem to do that.
-----Original Message-----
Sent: Monday, November 01, 2010 3:21 AM
To: Discussion list for Audacity users
Subject: Re: [Audacity-users] high-pitched noise in recording
Hi Bob,
I found only a fundamental at 2750 Hz which nearly corresponds to F7 on the
keyboard (3-and-a-bit octaves above middle-C). [2793.83 is the correct
frequency for that F-note]
Also, 2nd, 3rd, 4th, 5th, and 6th harmonics. There was no trace of any other
frequencies which indicated that the noise replaced the commercials.
As an experiment, I chopped out the noise and the commercial *seemed* to
sound as if the it was paused during the 11 or so seconds the noise was
received.
I have had a very similar problems with sound recorded off YouTube and the
BBC website, only without the noise, just silence - at least, it *sounded*
like silence. Deleting the "silences" restored the audio, as with the
commercial mentioned above.
Maybe it's just what the net was sending you? Or an artifact of buffering
somewhere?
Kind Regards
Allistair
----- Original Message -----
Sent: 01 November 2010 00:54
Subject: Re: [Audacity-users] high-pitched noise in recording

... The high-pitched noise I'm not sure I followed you on. What is

happening

has happened twice.

The instructions I gave about Notch Filter assumed the transmission
was affected by high-pitched interference that overlaid the "signal"
(the commercial) and of course that you recorded it like this.
If it sounds like the audio is being replaced with the noise, this might
still be because the noise is louder than the signal, so could be filtered
out. The sort of noise you are describing would usually not have a wide
frequency range, so the least damaging way to remove it would be to
find its frequency using Plot Spectrum, then notch filter that frequency.
If the audio really is being replaced with the high frequency noise, so
that you would have silence if you removed the noise, then clearly the
best way to remove it is to delete it, but you would have to do it
manually. Unless obscene words in the ads are being bleeped out by
the broadcasters, I would think it more likely that the interference is
laid on top of the ads.
If you want someone's opinion, you would have to upload an example
MP3 somewhere a few seconds long, containing the noise and the ad
either side of the noise. Then post the address the MP3 can be
downloaded from.
Gale

High all, I just did a recording of a radio station the other day... a

sort

of high-pitched noise is heard for a few seconds. Is there any way I can

get

rid of this

Try selecting the few seconds that has the noise, and Analyze > Plot
Spectrum. If you could see the spectrum this would hopefully show you
a spike towards the right (high frequency) side of the plot where the
audio was much louder at that frequency than either side of it.
Then you would use Notch Filter (extra plug-in) or Effect > Nyquist
Prompt to filter out the frequency where the spike was. You can read
http://wiki.audacityteam.org/wiki/Noise_Removal#Other_Techniques
Since you can't I assume see the spectrum plot, export it using the
"Export" button, open it in a text editor, then look for a frequency on
the left where the level on the right has much smaller negative numbers
10766.601563 -41.084888
10852.734375 -27.513941
10938.867188 -8.378978
11025.000000 -5.945557
11111.132813 -16.059376
11197.265625 -36.729332
11283.398438 -45.824223
11369.531250 -50.926151
indicates a frequency centred on about 11000 Hz that is much louder
than other audio in surrounding frequencies. So filter out 11000 Hz in
that case.

----------------------------------------------------------------------------

----------------------------------------------------------------------------
--

About

bob cavanaugh

2010-11-02 23:49:43 UTC

Permalink

So how do I edit out just the noise?

-----Original Message-----
From: Allistair Bywater [mailto:***@gmail.com]
Sent: Monday, November 01, 2010 3:33 PM
To: 'Discussion list for Audacity users'
Subject: Re: [Audacity-users] high-pitched noise in recording

Hi,

Yes, it really seemed to carry on - at least in the sample you posted... but

maybe it was only co-incidental. Try it on the sample and see what you
think.

However, I would try just editing out those other moments and see what it
sounds like, you can always undo...

Kind Regards

Allistair
***@gmail.com

----- Original Message -----
From: "bob cavanaugh" <***@comcast.net>
To: "'Allistair Bywater'" <***@gmail.com>; "'Discussion list for
Audacity users'" <audacity-***@lists.sourceforge.net>
Sent: 01 November 2010 22:22
Subject: RE: [Audacity-users] high-pitched noise in recording

... The high-pitched noise I'm not sure I followed you on. What is

happening

has happened twice.

The instructions I gave about Notch Filter assumed the transmission
was affected by high-pitched interference that overlaid the "signal"
(the commercial) and of course that you recorded it like this.
If it sounds like the audio is being replaced with the noise, this might
still be because the noise is louder than the signal, so could be filtered
out. The sort of noise you are describing would usually not have a wide
frequency range, so the least damaging way to remove it would be to
find its frequency using Plot Spectrum, then notch filter that frequency.
If the audio really is being replaced with the high frequency noise, so
that you would have silence if you removed the noise, then clearly the
best way to remove it is to delete it, but you would have to do it
manually. Unless obscene words in the ads are being bleeped out by
the broadcasters, I would think it more likely that the interference is
laid on top of the ads.
If you want someone's opinion, you would have to upload an example
MP3 somewhere a few seconds long, containing the noise and the ad
either side of the noise. Then post the address the MP3 can be
downloaded from.
Gale

High all, I just did a recording of a radio station the other day... a

sort

of high-pitched noise is heard for a few seconds. Is there any way I can

get

rid of this

Try selecting the few seconds that has the noise, and Analyze > Plot
Spectrum. If you could see the spectrum this would hopefully show you
a spike towards the right (high frequency) side of the plot where the
audio was much louder at that frequency than either side of it.
Then you would use Notch Filter (extra plug-in) or Effect > Nyquist
Prompt to filter out the frequency where the spike was. You can read
http://wiki.audacityteam.org/wiki/Noise_Removal#Other_Techniques
Since you can't I assume see the spectrum plot, export it using the
"Export" button, open it in a text editor, then look for a frequency on
the left where the level on the right has much smaller negative numbers
10766.601563 -41.084888
10852.734375 -27.513941
10938.867188 -8.378978
11025.000000 -5.945557
11111.132813 -16.059376
11197.265625 -36.729332
11283.398438 -45.824223
11369.531250 -50.926151
indicates a frequency centred on about 11000 Hz that is much louder
than other audio in surrounding frequencies. So filter out 11000 Hz in
that case.

----------------------------------------------------------------------------

Post by bob cavanaugh

----------------------------------------------------------------------------

Post by bob cavanaugh
--

About

----------------------------------------------------------------------------

g***@audacityteam.org

2010-11-05 00:56:51 UTC

Permalink

On Tue, 2 Nov 2010 16:49:43 -0700

Post by bob cavanaugh
So how do I edit out just the noise?

On your sample there is no meaningful audio after you filter out the
2750 Hz, so you may as well just delete it IMO. It sounds to me as
if the transmission just dropped out where the quiet HF noise
occurred.

Gale

Post by bob cavanaugh
-----Original Message-----
Sent: Monday, November 01, 2010 3:33 PM
To: 'Discussion list for Audacity users'
Subject: Re: [Audacity-users] high-pitched noise in recording
Hi,
Yes, it really seemed to carry on - at least in the sample you posted... but
maybe it was only co-incidental. Try it on the sample and see what you
think.
However, I would try just editing out those other moments and see what it
sounds like, you can always undo...
Kind Regards
Allistair
----- Original Message -----
Sent: 01 November 2010 22:22
Subject: RE: [Audacity-users] high-pitched noise in recording

bob cavanaugh

2010-11-05 02:40:22 UTC

Permalink

Hmm, I wonder why it did that. I don't know if this is a bug with truncate
silence or a problem with the stream. I know I was around when it happens
the first time and I don't remember turning the speakers up loud at the
segment in question.

-----Original Message-----
From: ***@audacityteam.org [mailto:***@audacityteam.org]
Sent: Thursday, November 04, 2010 5:57 PM
To: audacity-***@lists.sourceforge.net
Subject: Re: [Audacity-users] high-pitched noise in recording

On Tue, 2 Nov 2010 16:49:43 -0700

Post by bob cavanaugh
So how do I edit out just the noise?

Post by bob cavanaugh
So what you are saying is that if you edit out the noise you are able to
get
the rest of the commercial back or does it just start from where it comes
back in? This is really curious though, because I was right there listening
to the audio as it was being recorded and it didn't seem to do that.
-----Original Message-----
Sent: Monday, November 01, 2010 3:21 AM
To: Discussion list for Audacity users
Subject: Re: [Audacity-users] high-pitched noise in recording
Hi Bob,
I found only a fundamental at 2750 Hz which nearly corresponds to F7 on the
keyboard (3-and-a-bit octaves above middle-C). [2793.83 is the correct
frequency for that F-note]
Also, 2nd, 3rd, 4th, 5th, and 6th harmonics. There was no trace of any other
frequencies which indicated that the noise replaced the commercials.
As an experiment, I chopped out the noise and the commercial *seemed* to
sound as if the it was paused during the 11 or so seconds the noise was
received.
I have had a very similar problems with sound recorded off YouTube and the
BBC website, only without the noise, just silence - at least, it *sounded*
like silence. Deleting the "silences" restored the audio, as with the
commercial mentioned above.
Maybe it's just what the net was sending you? Or an artifact of buffering
somewhere?
Kind Regards
Allistair

----------------------------------------------------------------------------
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*********** ASKING FOR HELP *************

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so we can
help you properly:

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10.5.1)

* Exactly what three digit version number of Audacity you are using (Help >
About
Audacity, or Audacity > About Audacity on a Mac computer)

* If this is a recording problem, what equipment you are recording with, and
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adamdaboss6

2017-02-14 04:59:10 UTC

Permalink

Im Using Windows 10
I'm on Audacity 2.1.2
I am using the Floureon BM-100FX, It is connected with USB into my laptop,
and the microphone jack with a sound splitter, also plugged in with USB on
my laptop.

Whenever I use my mic to record my voice. There is a loud buzzing noise, its
high pitches, and it is way louder than my voice.

--
View this message in context: http://audacity.238276.n2.nabble.com/high-pitched-noise-in-recording-tp5688266p7578357.html
Sent from the audacity-users mailing list archive at Nabble.com.

------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, SlashDot.org! http://sdm.link/slashdot
*********** ASKING FOR HELP *************

When asking for help on this list, please include the following information, so we can
help you properly:

* What operating system you are using (for example, Windows XP or Mac OS X 10.5.1)

* Exactly what three digit version number of Audacity you are using (Help > About
Audacity, or Audacity > About Audacity on a Mac computer)

* If this is a recording problem, what equipment you are recording with, and how is it
connected to the computer?

Mailing list: Audacity-***@lists.sourceforge.net
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Gale Andrews

2017-02-14 13:45:53 UTC

Permalink

adamdaboss6 did not subscribe to the list so please reply all if replying.

This is where you are meant to subscribe to this list:
https://lists.sourceforge.net/lists/listinfo/audacity-users .

The product reviews for this on Amazon are not good. It is unusual to need
two USB cables for a USB mic.

Right-click over the speaker icon by the system clock, then choose
"Recording Devices". Right-click over the mic then choose "Properties".
Then click the "Levels" tab and see if you can turn any boost controls off.

Gale

Post by adamdaboss6
Im Using Windows 10
I'm on Audacity 2.1.2
I am using the Floureon BM-100FX, It is connected with USB into my laptop,
and the microphone jack with a sound splitter, also plugged in with USB on
my laptop.
Whenever I use my mic to record my voice. There is a loud buzzing noise, its
high pitches, and it is way louder than my voice.
--
View this message in context: http://audacity.238276.n2.nabble.com/high-pitched-noise-in-recording-tp5688266p7578357.html
Sent from the audacity-users mailing list archive at Nabble.com.
------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, SlashDot.org! http://sdm.link/slashdot
*********** ASKING FOR HELP *************
When asking for help on this list, please include the following information, so we can
* What operating system you are using (for example, Windows XP or Mac OS X 10.5.1)
* Exactly what three digit version number of Audacity you are using (Help > About
Audacity, or Audacity > About Audacity on a Mac computer)
* If this is a recording problem, what equipment you are recording with, and how is it
connected to the computer?
https://lists.sourceforge.net/lists/listinfo/audacity-users

------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, SlashDot.org! http://sdm.link/slashdot
*********** ASKING FOR HELP *************

When asking for help on this list, please include the following information, so we can
help you properly:

* What operating system you are using (for example, Windows XP or Mac OS X 10.5.1)

* Exactly what three digit version number of Audacity you are using (Help > About
Audacity, or Audacity > About Audacity on a Mac computer)

* If this is a recording problem, what equipment you are recording with, and how is it
connected to the computer?

Mailing list: Audacity-***@lists.sourceforge.net
To UNSUBSCRIBE, use the form at the bottom of this web page:
https://lists.sourceforge.net/lists/listinfo/audacity-users