Audio Demonstration Files for Improved DUET

We present several audio demonstrations files here to show how the phases aliasing correction technique presented in the paper Phase aliasing correction for robust blind source separation using DUET can improve the performance of DUET. First we include the files from artificially mixed audio mixtures using the mixing model

X1 = S1(t) + S2(t), X2= S1(t+2) + 0.9 S2(t-d).

As the value of d increases the performance of the original DUET deterioates due to phase wrap-around aliasing. The performance with the phase aliasing correction offers substantial improvement. Even with shift d as large as 90 (which corresponds to two microphones being spaced at least as far as 2m (in 16kHZ sampling frequency). We include examples of d = 7, 20, 60, 90.

Sources (10 seconds each)

Source 1,   Source 2

Example 1.   d=7

Mixture 1,   Mixture 2,   Original DUET demixed source 1,   Original DUET demixed source 2,   New demixed source 1,   New demixed source

Example 2.   d=20

Mixture 1,   Mixture 2,   Original DUET demixed source 1,   Original DUET demixed source 2,   New demixed source 1,   New demixed source 2

Example 3.   d=60

Mixture 1,   Mixture 2,   Original DUET demixed source 1,   Original DUET demixed source 2,   New demixed source 1,   New demixed source 2

Example 4.   d=90

Mixture 1,   Mixture 2,   Original DUET demixed source 1,   Original DUET demixed source 2,   New demixed source 1,   New demixed source 2

We should point out that one source (Source 2) is stronger than Source 1 in the mixture. When you listen to demixed Source 2 in the original DUET, what you hear is in fact essentially the original mixture with almost no separation.

Wre also include a couple of real recordings examples, each of which consists of a two-speaker mixture recorded in two channels. In the second example, one of the speakers was in motion.

Real Recording 1 (regular office, cheap Skype microphones about $13 apiece, moderately echoic). 

Mixtures (two channels stereo),   Separated Speaker 1,   Separated Speaker 2

Real Recording 2 (regular office, better microphones about $100 apiece, moderately echoic, one speaker was walking back and forth). 

Mixtures (two channels stereo),   Separated Speaker 1,   Separated Speaker 2

 

 

 

 


For a list of published papers please check out my publications site.


[Last updated on July 23, 2010]


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