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Mono vs. stereo

 
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rmccord



Joined: 28 Mar 2010
Posts: 30
Location: Nevada City, CA

PostPosted: Mon Jan 21, 2013 4:20 am    Post subject: Mono vs. stereo Reply with quote

I'm recording spoken word with a mic setup that gives me just one line down the center in Amadeus pro, not separate L & R. However, the sound does come equally through both the L & R sides of my headphones, so I hear the sound in the center of my head. This is great.

Is there any reason to turn it into a stereo track for the final product? My unschooled ear can't really tell the difference if I do, and avoiding stereo tracks sure keeps the file size smaller. Am I missing something here, quality-wise?

Thank you.
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rfwilmut



Joined: 17 Nov 2006
Posts: 255

PostPosted: Mon Jan 21, 2013 11:16 am    Post subject: Reply with quote

There is no point whatever in turning this into a stereo file: it will have no effect at all on the quality and will simply double the file size.
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Martin Hairer
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Joined: 08 Nov 2006
Posts: 1612

PostPosted: Mon Jan 21, 2013 3:42 pm    Post subject: Mono vs. stereo Reply with quote

Yes, that's right. If the signal is the same on the two channels, but the noise is different (i.e. if the tape is actually a stereo tape, but with a mono recording on it), then you might even improve the quality slightly by converting from stereo down to mono, due to cancellations between the noises. Regards,

Martin

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CDJonah_alt



Joined: 15 Mar 2007
Posts: 378

PostPosted: Mon Jan 21, 2013 4:18 pm    Post subject: Mono vs. stereo Reply with quote

Are you sure they are identical? You can check by using the stereo
utilities to invert one track and then convert to mono. If they are
identical, you will get a straight line.

Chuck

On 1/21/13 9:20 AM, Cherrill Heaton wrote:
Quote:
Quote:
There is no point whatever in turning this into a stereo file: it
will have no effect at all on the quality and will simply double the
file size.

Is the reverse also true? Can a stereo file for which both channels
are identical be converted to mono with no effect on quality and a
halving of file size?

Using Sound>Record to new document...I have been transferring tapes
into Amadeus Pro from a cassette deck. Don't know if this is the
default, but I see that the Quality>Configuration I have been using is
Stereo (front). If the content of the two tape channels is identical,
can I convert the Amadeus stereo files derived from these tapes to
mono without affecting quality?

For such tapes, should I perhaps be using a Quality>Configuration of
Mono (front)? Thanks.

Cherrill
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Charles D Jonah
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Chemical Sciences and Engineering Division
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Argonne, IL 60439
630-252-3471 CDJonah@anl.gov

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Jim Edgar



Joined: 01 Mar 2010
Posts: 95

PostPosted: Mon Jan 21, 2013 6:49 pm    Post subject: Mono vs. stereo Reply with quote

In the olden days, we used to create fake stereo by running a slight delay between the channels. 

You could run it through a stereo panned delay or reverb to give it more depth and space.  

But, those are mostly aesthetic choices. 

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jimedgarvoices@gmail.com (jimedgarvoices@gmail.com)
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CDJonah_alt



Joined: 15 Mar 2007
Posts: 378

PostPosted: Mon Jan 21, 2013 7:23 pm    Post subject: Mono vs. stereo Reply with quote

Note, for default settings, one gets the same size file for a mono and a
stereo file if it is saved as an mp3 in AP 1 -- don't know about 2 yet
as this computer is too old for that.

Chuck

On 1/21/13 9:20 AM, Cherrill Heaton wrote:
Quote:
Quote:
There is no point whatever in turning this into a stereo file: it
will have no effect at all on the quality and will simply double the
file size.

Is the reverse also true? Can a stereo file for which both channels
are identical be converted to mono with no effect on quality and a
halving of file size?

Using Sound>Record to new document...I have been transferring tapes
into Amadeus Pro from a cassette deck. Don't know if this is the
default, but I see that the Quality>Configuration I have been using is
Stereo (front). If the content of the two tape channels is identical,
can I convert the Amadeus stereo files derived from these tapes to
mono without affecting quality?

For such tapes, should I perhaps be using a Quality>Configuration of
Mono (front)? Thanks.

Cherrill
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Charles D Jonah
Building 200
Chemical Sciences and Engineering Division
9700 S. Cass Avenue
Argonne, IL 60439
630-252-3471 CDJonah@anl.gov

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pm@philxmilstein.com



Joined: 12 Nov 2006
Posts: 84

PostPosted: Mon Jan 21, 2013 8:32 pm    Post subject: Mono vs. stereo Reply with quote

Yes, but as I understand it when compressing a mono file to MP3 you can do
so at half the bitrate (vs. a stereo file) without any loss of data.

I can't swear that that's absolutely true, but the person who told it to me
is fairly expert on such matters, and so I've taken his word for it. I've
been working that way for years, and if there is any loss I've certainly
never noticed it.

--Phil M.


Charles Jonah wrote:

Quote:
Note, for default settings, one gets the same size file for a mono and a
stereo file if it is saved as an mp3 in AP 1 -- don't know about 2 yet
as this computer is too old for that.

Chuck

On 1/21/13 9:20 AM, Cherrill Heaton wrote:
Quote:
Quote:
There is no point whatever in turning this into a stereo file: it
will have no effect at all on the quality and will simply double the
file size.

Is the reverse also true? Can a stereo file for which both channels
are identical be converted to mono with no effect on quality and a
halving of file size?

Using Sound>Record to new document...I have been transferring tapes
into Amadeus Pro from a cassette deck. Don't know if this is the
default, but I see that the Quality>Configuration I have been using is
Stereo (front). If the content of the two tape channels is identical,
can I convert the Amadeus stereo files derived from these tapes to
mono without affecting quality?

For such tapes, should I perhaps be using a Quality>Configuration of
Mono (front)? Thanks.

Cherrill
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CDJonah



Joined: 11 Nov 2006
Posts: 111

PostPosted: Mon Jan 21, 2013 10:35 pm    Post subject: Mono vs. stereo Reply with quote

Of course -- when we select mp3 we define the bitrate we want to use so
we get the same bitrate independent of the number of tracks.

I think I am a little(?) slow today (maybe everyday).

Chuck

On 1/21/13 1:32 PM, Phil X Milstein wrote:
Quote:
Yes, but as I understand it when compressing a mono file to MP3 you can do
so at half the bitrate (vs. a stereo file) without any loss of data.

I can't swear that that's absolutely true, but the person who told it to me
is fairly expert on such matters, and so I've taken his word for it. I've
been working that way for years, and if there is any loss I've certainly
never noticed it.

--Phil M.


Charles Jonah wrote:

Quote:
Note, for default settings, one gets the same size file for a mono and a
stereo file if it is saved as an mp3 in AP 1 -- don't know about 2 yet
as this computer is too old for that.

Chuck

On 1/21/13 9:20 AM, Cherrill Heaton wrote:
Quote:
Quote:
There is no point whatever in turning this into a stereo file: it
will have no effect at all on the quality and will simply double the
file size.

Is the reverse also true? Can a stereo file for which both channels
are identical be converted to mono with no effect on quality and a
halving of file size?

Using Sound>Record to new document...I have been transferring tapes
into Amadeus Pro from a cassette deck. Don't know if this is the
default, but I see that the Quality>Configuration I have been using is
Stereo (front). If the content of the two tape channels is identical,
can I convert the Amadeus stereo files derived from these tapes to
mono without affecting quality?

For such tapes, should I perhaps be using a Quality>Configuration of
Mono (front)? Thanks.

Cherrill
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Martin Hairer
Site Admin


Joined: 08 Nov 2006
Posts: 1612

PostPosted: Tue Jan 22, 2013 9:26 am    Post subject: Mono vs. stereo Reply with quote

Quote:
Yes, but as I understand it when compressing a mono file to MP3 you can do
so at half the bitrate (vs. a stereo file) without any loss of data.


I think this is basically true, but only if the two channels are absolutely identical (i.e. the same noise as well, not just the same signal) and you make sure to have "joint stereo" enabled for the encoder. Regards,

Martin

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rmccord



Joined: 28 Mar 2010
Posts: 30
Location: Nevada City, CA

PostPosted: Sat Jan 26, 2013 1:30 am    Post subject: Reply with quote

Thanks for your help, Martin and everyone. Very informative, and it will save me a whole bunch of space.

Best wishes,
Rich
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