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Blind Signal Separation Using Directivity Pattern

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... Blind Source Separation (BSS) ... – PowerPoint PPT presentation

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Title: Blind Signal Separation Using Directivity Pattern


1
??????????? ????????????
  • ?????????????
  • ??????? ????????
  • ?? ?

2
?????
  • ??????????????
  • ?????????????????
  • ????????????????
  • ?????????????
  • ???????????????????
  • ??????????????
  • ?????????
  • ?????

3
??????????????
  • ??????????????
  • ???????? ?????????
  • ???? ?????????????
  • ??????????????????
  • ???? hands-free ??
  • ????????????
  • ??????????????????

4
?????????????
  • ??????????????????
  • ??????????????????

???
????????????
?
??????
??????????????
?
??
5
????????????
  • Blind Source Separation (BSS)
  • ????????????????????????????????????????
  • ???????????????
  • ??????(ICA)????BSS
  • J. Cardoso, 1989
  • C. Jutten, 1990 (??????)
  • P. Common, 1994 (ICA????????)
  • A. Bell et al., 1995 (infomax??????)

6
ICA????BSS ???
????
Human 1
Source 1
Microphone 1
Observed signal 1
Microphone 2
Observed signal 2
?????
Source 2
???????
Human 2
7
ICA????BSS????
??????
????
????
????
????
????
????
?????
???
???
8
ICA????????????
????????
  • ????
  • ?????????
  • ?????1
  • ?????????
  • ?????2
  • ????????????

????????
9
ICA????BSS????
  • ICA????????????????
  • ? ???????????
  • ? ???????
  • ???????????????????
  • ? ??????????????????? ?????????????
  • ? ICA?????????????????

10
ICA?????????????
  • ????????ICA-based BSS?????????????????
  • ?????????????????

?????????????? ????????BSS
11
??????????
??????
?????????
????????? ?????????
???????? ???????
A????
  • ??????????????????????????????????????

12
???????
  • ICA??????????????????????????(???????????)
  • ICA???????????????????????????????
  • (??????????????)
  • ICA?????????????????????????????
  • (???????????)

13
???????????
  • (1)?????ICA???BSS
  • ? ????????????????????

(2)???????????????????????
(3)???????????????(1),(2)???
14
(1)?????ICA???????
????? ???????????????
15
(1)????????
  • Iterative off-line learning algorithm
  • where

16
(2)????????????
  • 1. ICA??????W????????????????????
  • 2.?????????????????????????????

17
(3)?????????????????
  • ???????????ICA??????????????
  • ??? ?????????? ??????

???
???????
???????????????????????
18
????
  • ???? 4 cm ? 2 ?????
  • ??
  • ?? -30, ?? 40? 2 ??(36??)
  • ????
  • ???? RT 0, 0.15, 0.30 sec
  • ????????
  • 1, 3, 5 ??????????
  • ????
  • Noise reduction rate (NRR)
  • ??SNR dB ??SNR dB
  • ????
  • Murata?(in ICA99 ??????????????)

19
?????????????
RT0.15 sec ???
????
???????, ICA-based BSS???SNR??
20
?????????????
????5 sec
?????????????????????
21
??????
  • ?????
  • ???
  • ??? (??,???????)
  • ??? (??, ????)
  • ??? (??, ????)
  • ?????? (???? 300 ms)
  • ???
  • ??? (??,???????)
  • ??? (??, ????)
  • ??? (??, ????)

(?????????? 3 ??????????)
22
??????????????
Init
Direction of Arrival Estimation
23
???????? ???????????? - ???ICA??? -
24
???????? ???????????? - ?????? -
25
??????????
26
RT150msec????????
27
??
  • ??????NRR????????????
  • ICA??????????????????????
  • ????????NRR?????????
  • ??????????????????????????????????????????????????
    ??????????

??????????BF?????????????
BF??????????????????
28
??????????????
29
?????(2???Cosine??)
????
2??????(???)
30
?????(Contd)
?
????????
?????????????????
?
??????
ICA???
31
???? 150 msec ????????
32
???????????????(???? 150 msec)
????????????
33
???? 300 msec ????????
34
??
  • ??????????????????(RT150 msec 4.6 dB, RT 300
    msec 1.5 dB)
  • ??????????????????
  • ?????????
  • ???????????ICA???????? ??????????????????????
  • ????????????ICA ?????? ?????????????????????
  • ICA??????????????????? ???????????????????

35
???????
  • ???? 150 msec
  • ????(?????)
  • ??????????(??)
  • ??????????(??)
  • ???? 300 msec
  • ????(?????)
  • ??????????(??)
  • ??????????(??)

36
?????
  • ICA???BSS?????????
  • ????????????????
  • ???????????????????????
  • ?????????????????????
  • ????????????????????????BSS?????????
  • 2?????????????
  • ????????(???????)

?? ??????????????? ?? ????????????ICA??????????
37
?????2
  • ??-?????ICA??????
  • ????????? ? ????????
  • ??????????
  • ????????????????????????
  • Permutation????

(??,?? ?,2001)
?????ICA??????? ?????????????????
38
????? vs. ????
39
??????BSS?????1
????5 sec
40
??????BSS?????2
????3 sec
5??3?????????????????????
41
??????BSS?????3
????1 sec
?????????Murata?????? ?????????????????????
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