[paranoia] Mono

[Sibbald, Alister]

I'm not sure that's right Jack.
If the programme material is Mono, then by definition both channels must be
identical. It is either a historical recording, which came from a single
track mono tape, or a more modern mix-down to mono, which results in the
same thing ( although I'm not sure why anyone would want to do the latter ).

Either way, if the source was a single mono channel, the CD creation process
should simply have duplicated that Mono channel on both Left and Right.

Therefore, if Boris is getting different data, I can only see two
possibilities:

1 The CD is simply mis-labelled and is not in fact Mono. In other words,
Paranoia is doing it's job correctly, but the source data really is
different. I can't see there is much potential for this. CD Publishers are
unlikely to label something Mono unless they really have to, for obvious
marketing reasons.
2 The CD is Mono, but Paranoia is not correcting all errors. It may for
example be interpolating over errors in one channel but not having to
interpolate over errors at the same point in the other channel.

        Regards
                Alister

-----Original Message-----
From: Jack Pistachio [mailto:jackpistachio at yahoo.com]
Sent: 20 September 2003 08:27
To: paranoia at xiph.org
Subject: Re: [paranoia] Mono

<p>Theoretically they should be the same.  However, I would
never expect the data to be exactly the same in a real
world situation.  Using diff or cmp for example on data
retrieved from just the right or left channel would always
differ as cd anomalies would lead paranoia or cdda2wav or
whatever is used to cause at least a single slight sample
difference.  If the music had any slight tick, etc in it,
this would surely be the case.  The important part is that
there should  be no audible difference.

--- "Sims, Ted" <ted at tedsims.com> wrote:
> There's no such thing as a mono format CD, but the
> program material might be
> mono in which case the left and right channels should be
> the same. If it
> isn't, then something is very wrong.
> -Ted
> 
> ----- Original Message ----- 
> From: "Boris Shingarov" <shingarov at istop.com>
> To: <paranoia at xiph.org>
> Sent: Friday, September 19, 2003 11:29 PM
> Subject: [paranoia] Mono
> 
> 
> > Hello,
> >
> > I have some CDs that are explicitly marked as mono.  I
> must have
> > understood something incorrectly.  When I extract raw
> audio from
> > those mono CDs, shouldn't the 'left' samples the same
> as the
> > 'right' samples?  This is not what I am seeing here;
> the data is
> > never the same.  Anyone willing to explain this?
> >
> > Boris
> >
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