[vorbis] Pitch shift with RC2

[- Sanspoof]

It's hard for me to tell if it's proportional with what I've got with me on 
my current business trip.  My hearing is much more sensitive in the higher 
ranges so I can pick out a slight freq. shift.  I hear it on the higher 
notes of music and in higher pitched instruments (violins, flutes, etc.)  
I'm not an expert in music or audio so all I can do is tell you what I hear 
and guess at the Hz shift.  I can tell you that it's not a tempo thing.  The 
music has the correct time.  I've got some nice clasical music I'm going to 
try RC2 on this weekend.  If I get a chance I'll make some samples of the 
shift available.

I have to say, I'm impressed with how much everone is putting into this 
shift problem.  Makes me long for the days when I was still a programmer. :)

From: ndrw mchl grnbrg <agreenbu at nyx.net>
Reply-To: vorbis at xiph.org
To: vorbis at xiph.org
Subject: Re: [vorbis] Pitch shift with RC2
Date: Wed, 15 Aug 2001 13:52:13 -0600
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- Sanspoof <sanspoof at hotmail.com> wrote:
: >Just a quick check...are you using RedHat RPMS ?
:
: No, using that GUI fishy tool on Windows 2000 to rip the files then 
playing
: it back on Winamp.  I pulled out my good headphone to make sure I was 
really
: hearing it.  (sorry about the 25KHz thing - meant to say 25 - 50 Hz. In
: other words, just barely audible)

25-50Hz is pretty noticeable, I think (especially in the bass guitar/cello
range), since it would shift an A-220 to a middle C. I had a tape player in
my car for a while that used to play the tapes too fast, and this drove me
nuts. Is the shifting proportionate (i.e. 220 * 1.1136 = 245) or fixed
(i.e. 220 + 25 = 245)? A fixed 25Hz shift would be much more noticeable on
the low notes than the high, and the resulting music would probably be
much more dissonant than the original.


--
  agreenbu @ nyx . net                             andrew michael greenburg
                      http://www.nyx.net/~agreenbu/

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