Forum: help

RE: Question about "mpd_demix" [ Reply ]
By: Sacha Krstulovic on 2007-02-02 09:25

> I guess that "mpd_demix" is an implementation from the good papers, (...) Am I right ?

Yes.

> If not, can "mpd_demix" handle single-channel source separation ?

No. For single channel separation, you can refer, e.g., to the works of Alexey Ozerov, Pierrick Philippe, Rémi Gribonval and Frédéric Bimbot. See their WASPAA 2005 article on:
http://www.irisa.fr/metiss/publications/gestion_publis/ref_biblio/ozerov02
Alexey completed his PhD on the subject very recently, he could probably send you his PhD report (email address in the WASPAA article).

Cheers;
-*- Sacha -*-

RE: Question about "mpd_demix" [ Reply ] By: Namgook Cho on 2007-02-01 21:35	[forum:2684]
Thanks. I guess that "mpd_demix" is an implementation from the good papers, "Under-determined source separation: comparison of two approaches based on sparse decomposition" by Lesage, you and R. Gribonval and "Sparse decomposition of stereo signals..." by R. Gribonval. Am I right ? If not, can "mpd_demix" handle single-channel source separation ?

RE: Question about "mpd_demix" [ Reply ]
By: Sacha Krstulovic on 2007-02-01 18:34

[forum:2683]

> The command contains "sndFILE.wav" as one of
> mandatory parameters. As mentioned in the
> user's manual, if we have 2 x 3 mixing matrix,
> should we assign two observation files
> (e.g., x1.wav and x2.wav), right ?

No, you should use a single wav file, but in multi-channel format (in your case, stereo). In multi-channel wav, the samples should be interleaved, e.g., in stereo:
[l0,r0,l1,r1,...,ln,rn]
where l is left, r is right and the integer is the sample time. See, e.g., http://www.borg.com/~jglatt/tech/wave.htm for more info about the wav format.
You can interleave as many channels as observations: with a 3x5 mixing matrix, you can interleave 3 observations of a 5 sources mix in a single wav file.

HTH;
-*- Sacha -*-

Question about "mpd_demix" [ Reply ]
By: Namgook Cho on 2007-02-01 18:11

[forum:2682]

I have a question about "mpd_demix."
The command contains "sndFILE.wav" as one of mandatory parameters. As mentioned in the user's manual, if we have 2 x 3 mixing matrix, should we assign two observation files (e.g., x1.wav and x2.wav), right ? I tried to assign the two observation files in "mpd_demix," but the command always produce error message. Could you let me know how to use "mpd_demix" when 2 x 3 mixing matrix is given ?