Hello,
I recently measured the distances ndist[0][nb_subvect-1] which are used
to make the decicion, which codebook entries are to be used in
libspeex/cb_search.c (function split_cb_search_shape_sign).
For that I took a couple of audio books (all german speech), downsampled
the tracks to 8kHz and encoded them with "speexenc -n --bitrate 15000
..." (I used svn revision 11825).
Usually, the distances are in average 7.544420 and the deviation of the
distances is around 2.139503.
But the encoding of the data of one of these CDs shows for some tracks
average distances of around 12163.722796 and a deviation of 24312.252308
(that's just one example, there are more of them). I find this quite
interesting. More interestingly, it still sounds alright.
Is somebody of you interested in the raw audio files producing these
weird distances? I think these weird distances are a problem in the
codec. Maybe it is possible to find out where the problem is more
exactly than based on tracks (maybe frames).
Regards,
Bj?rn
PS: if anybody of you uses R, I could send the R workspace file, too.
--
You will triumph over your enemy.
--
Important! Please recognize my new GPG Public Key!
Bj?rn Thalheim
gpg fingerprint: 2F22 AAEB 1818 1548 EC78 1AE8 9D2E FCB4 0980 28CC
download key: wget http://www.ifsr.de/~bjoern/gpg/public_key.asc
See also: http://www.ifsr.de/~bjoern/gpg/key.html
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Bj?rn,
I would be very interested in looking at your data and the R file.
Actually, I think a lot of people would. You might want to post it on a
website...
CB
-----Original Message-----
From: speex-dev-bounces@xiph.org [mailto:speex-dev-bounces@xiph.org] On
Behalf Of Bj?rn Thalheim
Sent: Monday, September 11, 2006 4:43 AM
To: speex-dev@xiph.org
Subject: [Speex-dev] Distances in codebook search
Hello,
I recently measured the distances ndist[0][nb_subvect-1] which are used to
make the decicion, which codebook entries are to be used in
libspeex/cb_search.c (function split_cb_search_shape_sign).
For that I took a couple of audio books (all german speech), downsampled the
tracks to 8kHz and encoded them with "speexenc -n --bitrate 15000 ..."
(I
used svn revision 11825).
Usually, the distances are in average 7.544420 and the deviation of the
distances is around 2.139503.
But the encoding of the data of one of these CDs shows for some tracks
average distances of around 12163.722796 and a deviation of 24312.252308
(that's just one example, there are more of them). I find this quite
interesting. More interestingly, it still sounds alright.
Is somebody of you interested in the raw audio files producing these weird
distances? I think these weird distances are a problem in the codec. Maybe
it is possible to find out where the problem is more exactly than based on
tracks (maybe frames).
Regards,
Bj?rn
PS: if anybody of you uses R, I could send the R workspace file, too.
--
You will triumph over your enemy.
--
Important! Please recognize my new GPG Public Key!
Bj?rn Thalheim
gpg fingerprint: 2F22 AAEB 1818 1548 EC78 1AE8 9D2E FCB4 0980 28CC
download key: wget http://www.ifsr.de/~bjoern/gpg/public_key.asc
See also: http://www.ifsr.de/~bjoern/gpg/key.html
Hi, Christopher Bader wrote:> I would be very interested in looking at your data and the R file. > Actually, I think a lot of people would. You might want to post it on a > website...http://www.ifsr.de/~bjoern/speex-dists/ The source code is readable, but unfortunataly, it is bad and undocumented. I hope it works. Ciao, Bj?rn -- Rebellion lay in his way, and he found it. -- William Shakespeare, "Henry IV" -- Important! Please recognize my new GPG Public Key! Bj?rn Thalheim gpg fingerprint: 2F22 AAEB 1818 1548 EC78 1AE8 9D2E FCB4 0980 28CC download key: wget http://www.ifsr.de/~bjoern/gpg/public_key.asc See also: http://www.ifsr.de/~bjoern/gpg/key.html -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 252 bytes Desc: OpenPGP digital signature Url : http://lists.xiph.org/pipermail/speex-dev/attachments/20060918/d80d1b20/signature.pgp