バイノーラル再生による屋外防災放送の単語了解度の再現精度
Accuracy of reproduction of the word intelligibility of out-door emergency sound system
by binaural sound reproduction
飯田一博u，野村宗弘u，石井要次u，大島俊也uu，内藤大介uu
Kazuhiro IIDAu, Kazuhiro NOMURAu, Yohji ISHIIu, Toshiya OHSHIMAuu, and Taiskuke NAITOuu
千葉工大，uuリオン
Chiba Institute of Technology, uuRION
u
u
内容概要
؎, HRTF Bĵ *ǀ,Óƽƻ+ăȠĉõȈżłDz,ÇǜˆǑėBƫ
ėǁµƂ>(BƓƑ(&Ƞbest-matching HRTF (I~g|XFgh[_k|BƇ
bFa~vxµƆňŰBļŝ ȡļŝŰ,ƫėBşǗ> 8ȠȥƠȚ,ËȓðBž
Ȕÿ+ǖý&ÇǜˆǑė(ƽÒ=+Bŭ8 ȡ<+Ƞ,ËȓðBļŝŰ'b
Fa~vxµƆ&ȠÇǜˆǑė(ƽÒ=+Bŭ8 ȡ…ƻBũǭ (@ȠÇ
ǜˆǑė+$&-ļŝŰ'Ëȓð(ƲǓƑŕĪ*čǛ8<?*ƫė'µƂ'>
(Ɯ? ȡƽÒ=++$&-ȠļŝŰ(Ëȓð(,č-ȥŨȍ,ǘýćėŰ
+&œ÷' 0.3 '
# ȡ
zx °¨´®rr
ĉõĴóRS\p+;>ȈżłDz,ˆǑė,݀Ȉ
ȓó,ˆǑėBƫė;Rouy~^>+-±Ąȓ,
ŏȆƀĨ:âűŃƀĨ!'-*ȠƢȆƀĨ$5=Ȥť
ż:ųż, 8,ȀNj*ƚơǠȘ'
>(-ǢB¦
®Ƒ*±ĄňÝ9µƂ>ĦNj
@ȡ,;*Õƽ
*ȡǀ+ȠȈżłDz-NJŃ,ëŽ+ǖƸ? Sd~
Ä,Ǚ6(&ȠžȔÿ+nxZZs|`xSd~JBǖ
J(“ȉȠúĈ(ã0)<łĄ>,'ȠÓƽŽ+NJŃ
Ƹ RS\pļŝ?&>[5]ȠËȓð,ȓóˆ
,ȓű±Ą>ȡ±Ąȓ,ŏȆč-..ŃƐowƟ
Ǒė,µƂƫė-ïá?&*ȡ
>-Ɵ,I~Y~(*=Ƞġƴ±Ąȓz|McSH
O~(*#&ȓó,ˆǑėBš>ȡ
,;*æȘBǑŮ> 8+Ţ*Ȓ<şǔ
Řƚơ'-ȠžȔÿ*),ƀ»*ǖ«BĦNj(*b
Fa~vxµƆ+ƘƓȠĉõȈżłDz,ÇǜˆǑė,µ
ƂƫėBşǗ>ȡ
Ƿ8<?&>ȡ¢.Ƞz|McSHO~ƅò'-ǎ
Ăė,ȝÇǜBƇ>(:[1] ÇǜȆ+Ǽ¹*m~
TBĸ±>(+;=[2] ÇǜˆǑė݀>(
Ɯ?&>ȡ5 Ƞ÷ċ<-ÛëŽ+&9ūǦ
ř•+;=ĉõĴóRS\p<łĄ? ȓó,˜ŀ
ƀĨǃôÄ>(BƜ&>[3]ȡ,;*
ƙnj+î%&ȠúĈ,ĕüƑ*™Ƹ:ūǦř•+Ǽħ
&łĄXFo|MB½Ĥ>DxPwTp9ļŝ?
&>[4]ȡ
ňȠŊû
>-ǖǓŨȍ,ĉõĴóRS\p+;=
˜Ǻ?>ȓóBRouy~^ȠÕƽÄ>('
?.Ƞ
ȓó,ˆǑėBƔĺǘ¤>('>ȡ !Ƞ
{x À¹¿ÇÄÅK¯`n¬^C7Dr
bFa~vxµƆ+&-Ƞ؎,Ȗǿ˜ǺȇŃ
(HRTF)( FEC (õƼǹ±Ô<h[_k|Bnjǯ7ȓȔ
F|d~Y|Sƿƈȓð,?(ƥ) h[_k|
BƇ>(+;=ȠËȓð(ÛŢ,ňÝ+ȓ­BµƂ'
>[6]ȡȠ?<,ř•ŷ ?*ðÚȠȓ
­ňÝ,¿ġǝºý:Ȗ³ý™ƏƆ>.5 Ƞȓǂ9
ôÄ>ȡ,;*ƂǦ+;=ȠȓóˆǑė,µƂƫė
š>ÕƾĨ
>ȡ
ĉõȈżłDz,ÕƽÄ+&-Ƞĩý?>Óƽƻ-
ƿ<, HRTF ]~XBĵ *ǀ,›Ū:ëňƿůœ
best-matching HRTF Bǽ·> 8,ȀçđěBŭ8 ȡ
,ȈżijĜƻ'
>ȡ5 ȠFEC h[_k|-±İè
ŦȒňÝ(ÛŢ,İȕȠ$5=ŋ؎ĭŽƉĨ, 10 ƨ
į,ƼĝƁBǞōôŃȠġň, HRTF , N1, N2 âűŃ
Ȑ'
=ȠĎǧåB¡A>Bģ*ȡ
#&ȠĉõȈżłDz,bFa~vxµƆ+&
-Ƞ“,Ȥ$,ǑŮ2ǠȘ
>(ƺ<?>ȡ
ȢȞÓƽƻ؎+ǼÚ> HRTF ,ļ£
BƓƑôŃ(&Ȁçđ¸śBDž# ȡ¸ś,ăǦ(
Ƽ,Ń- 36 '
>ȡ
ǞōôŃ,¨ŃBô*<²&,ǞōôŃ,ư6Ú
ȣȞĆŃ, HRTF +;>–Ī,Ȥť®ňÝ1,½Ĥ
A+$&Ȁçđ¸śBDžȠƇ ²&,ǞōôŃ,
ȤȞh[_k|õƼǹ±Ô˜ǺȇŃ,ĞȔ,šų
p © 0.05 ŗŷ$Ȁƕȇ¥Ńœ÷(*>ư6ÚA
“+Ƞ?<,ǠȘǑŮ>ňƧBDZ2>ȡ
Bŭ8 ȡdž 1 ,ת+ġň,Ȁçđ¸śƱŜBƜȡġ
ň'-ȠN1 +$&- 4 ƠȚ (x4, x6, x7, xa)ȠN2 +$
{xzx ZX®f!©· ˆŒŽ‡ ¯4r
‚ƀýöŃ,Óƽƻ??+ǼÚ> HRTF (&
ǃƻ<ļŝ
best-matching HRTF BƪÇ+Ǟō>ȡ
{xzxz 7¯ ‘“›œw—œ’•–˜”rˆŒŽ‡r
&- 1 ƠȚ (x4) ,ƼĝƁcvq~Xǽ.? ȡ¿ň
(-ƍ*=Ƞx4 (ƼǮ,ē) (,ƕȇȝȡN1 ;/
N2 ,Ȁƕȇ¥Ń-?? 0.71 ;/ 0.53 '
=Ƞ¿ň
;=9š©(*# ȡȠĔìƳăŧč-??
Iida et al. [7]-Ƞŋ؎ĭŽƉĨ 54 Ƽ, HRTF ( 10 ƨį
0.08 ;/ 0.09 oct.'
=Ƞ¿ň(Ûƥ'
# ȡ
,ƼĝƁ (é 1︎) BŵýȠȀçđ¸ś+;=…ƻ,ȇ
x1
x4
x2
¥B¸ś ȡ€ŌǐƙǍ,İĹ=(&ȀNj*ğÀB
Ŝ &> HRTF ,ȣ$,SjL^vxa[Z (N1,
N2) [8],âűŃ+-șǃ*¨Žč
>ȠÙÓƽƻ,Ŧ
x8
x7
ȒňÝ (0°) ,HRTF ,N1, N2 âűŃ-dž1︎,Čª+Ɯ
x6 x5
ȧƨį (x2, x3, x6, x8, xd, xa),ƼĝƁ'Ļý'>(
BƜ ȡ
<+ȠĠ<-ƼĝƁ<Ļý
N1, N2 âűŃ+
x3
&Ér ˆŒŽ‡ ®L ªYgr
r
[ zr hPj<V=r
best-matching HRTF (ãC!ȡÂ&ȠŦȒňݓõ,€
best-matching HRTF (&ȠŦȒňÝ, best-matching
HRTF ,ļ£ƻ,€ÆƃŦ†Ȓ HRTF B¯& ȡ
&؎ HRTF (Ûƥ,ȓ­ý™ƫėģ<? ȡ
{xzx{ 07¯ ‘“›œw—œ’•–˜”rˆŒŽ‡r
*<Ƞ;=ƫė,ȝȓ­½ĤBþƂ>+-Ƞ
¿ň“õ,€ÆƃŦ†Ȓ+&9ȓŸňÝ( (¢
. 30°ȆȎ) + best-matching HRTF Bŭ8>ňŰBƛƣ
>(Ŗ5ȡŘƚơ'-ȠŇ +ġň (180°) ,
'
'
'
'
'
! #$ $
!""$! ! $
&
#!%$ "#%
""!"!$
HRTF Ƈ&ȓ­ý™þȜBDž# (@Ƞ€ň'-؎
ň (0°) ;/ġň (180°) +&-²&,Óƽƻ+
r
"##! ! $'
'
'
'
'
,;+&ŭ8 €ÆƃŦ†Ȓ, best-matching
HRTF ;=9ý™ƫėš Óƽƻ 9,,Ƞ¿
Depthmax
xa
œ 9 ǰ HRTF B ] ~ X i ~ S [9] < ǽ · ÆƃŦ†Ȓ, 6 ňÝ (€Ōǐ: 30-180°, 30°ȆȎ) ,
xd
{x{x Bk ˆŒŽ‡ ¬Yi-®µ·ËAl1r
ĆŃ, HRTF +;=–Ī,Ȥť®ȓ­½ĤBþƂ>
ňŰ,Ȣ$(&ȠMorimoto et al. [10]-Ŧ†Ȓ³, HRTF
+…ƼȆčKu~ƒ>ňŰBļŝ&>ȡĠ<-,Lj
Ȝƻ؎,€ÆƃŦ†Ȓ, HRTF (LjȜƻ؎,ŬĔȒ
𝑃𝑃!,! (𝜔𝜔) = 𝑆𝑆(𝜔𝜔) ∙ 𝐻𝐻𝐻𝐻𝐻𝐻𝐹𝐹!,! (𝜔𝜔) / (𝑀𝑀!,! (𝜔𝜔) ∙ 𝑃𝑃𝑃𝑃𝑃𝑃!,! (𝜔𝜔)) (1)
³,…ƼȆŏȆč (ITD) +;=Ƞ€ÆƃȒ,–Ī,Ȥť
®ňÝ1,ȓ­½ĤÕƾ'
>(Bȓ­ý™þȜ+
;=Ɯ
ȡ<+ȠĀŘ<[11]-€ÆƃŦ†Ȓ,
best-matching HRTF(LjȜƻ؎,ITD BƇ&9ÛŢ+
'ȠP -h[_k|<ļƜ>¾źȠS -ȓŸ§
ØȠl ( r -Ƽ,Č×Ƞ M -Ft~nFLzk|,˜Ǻȇ
ŃȠPTF -h[_k|<õƼǹ±Ô(ȅñƁī)5',˜
ǺȇŃ'
>ȡ
€ÆƃȒ,–Ī,Ȥť®ňÝ1,ȓ­½ĤÕƾ'
>
(BƜ ȡ
?<,ƱŜ+;=ȠȤť®ȓ­½Ĥ'Ź«2
HRTF -Ŧ†Ȓ³,9,+Ȋý'>ȡ
RS\p B '- {xzw{x| ,ǥǢBǪ5Ƞbest-matching
HRTF (Ďǧ,I~g|XFgh[_k|BƇ ȡ,
RS\p'-h[_^v[J9şǔ ȠLjȜƻ*
=ĪǤƑ+ȖBçǫ*(Ê#&ȓ­ý™ƫėÃ
{x|x Á¼¾Âƞ)Ydej5¯/m¯
Er
Møller et al. [12]- FEC h[_k|(6*>ŤƠ(
Ä>(‰«þȜ'ºō
8Ƞ¡Ƈ*# ȡ
System%A
&ȡAKG K1000ȠStax SR lambda professional ;/
Note%
PC
Beyerdynamic DT990 professional B
&>
Audio%
I/F
{x}x ;QS«4>©·À¹¿ÇÄÅK7Dr
Amp.
FEC%
Headphones
A/D
Ear%
Microphones
Amp.
OPEN%type%
Headphones
System%B
Řƚơ'-ȠNJŃ,ĉõĴółDz,úĈ-Óƽƻ<Ń
Note%
PC
Ɛ m ȏ? ™Ƹ+
>(ĩý&±Ąȓ,”ǐ- 0°(6
Audio%
I/F
& {r Kº»½Ãr
*Ƞň™ǐ!BÒ=ıȡ$5=ȠȓŸ-ŬĔȒ³+
>(6* ȡ
€Ǖ {xzw{x{ ,ǥǢBǪ5Ƞ¿ň (0°) , best-matching
HRTF + ITD B‘Â>('¿ň,ŬĔȒ³B½ĤȠ
ġň (180°) , best-matching HRTF + ITD B‘Â>(
'ġň,ŬĔȒ³B½Ĥ>ȡ5 Ƞ{x| 'Ʈ
FEC
h[_k|-?9ǀ+-±İèȐ'
> 8Ƞ
DT990 professional (Ûƥ,ĨƾB9$Ďǧ,I~g|X
Fgh[_k| (audio-technica ATH-AD700)BƇ>ȡ
{x~x l*+pr
€ǕbFa~vxµƆňŰ,ȓ­ý™ƫėBşǗ ȡ
{x~xz +p7Dr
ƒr€r K7Dr
dž 2 +ƜȥƠȚ,µƆňŰBƇ ȡµƆňŰȢ-Ř
Ž HRTF (own) ( FEC h[_k|BƇ RS\p'Ƞ
ËƄdz=,ƄĩƑ*RS\p'
>ȡµƆňŰȣ- HRTF
-؎,9,'
>Ƞh[_k|-Ďǧ,I~g|XF
g (OPEN) ( ȡµƆňŰȤ-Řƚơ'ļŝ>ňŰȠ
*A" best-matching HRTF (bm) (I~g|XFgh[
_k|'
>ȡũǭ, 8ȠYo~h[_ (B&K Type
4128C︎) (I~g|XFgh[_k|+;>µƆňŰȥB
 ȡ
[ {r À¹¿ÇÄÅK7Dr
‚r€r +pº»½Ãr
ȓ­ý™þȜ-Ȉȓÿ'Dž# ȡÿ,³Ű- 4.6m (W)
再生方法�
5.8m (D) 2.8m (H)'Ƞ
Őțȓ-19.5 dB(A)'
# ȡ
é 2 +Ɯ 2 ƠȚ,RS\pBƇ ȡ
RS\p A -Ƽ±Á§Ø,ÌĂ*µƂBƓƑ( 9
HRTF�
システム�
1�
本人(own)�
FEC�
A�
2�
本人(own)�
OPEN�
B�
3�
best-matching(bm)�
OPEN�
B�
4�
HATS�
OPEN�
B�
,'Ƞa~^ PC (Lenovo T420)ȠI~]EI I/F (Fireface
r
400)ȠD|g (Marantz PM 4001)ȠFEC h[_k| (AKG
„r€r O@7"r
K1000)ȠA/D O|b~X (Roland M-10MX)ȠFt~nF
ヘッドホン�
ƓţňÝ-ŦȒ (ªňǐ 0°,€Ōǐ 0°) ;/Ɨġ@
Lzk|[7]'šĭ ȡµƆƬ˜ǺȇŃBljŦ> 8Ƞ
(ªňǐ 0°,€Ōǐ 180°) ,ȣňÝ'
>ȡ
ě(1)+Ɯ§Ø¶ƄBʼn&àƜ ȡ
…r€r \pXr
LjȜƻ-20’,üƆ8Ü (ƉĨ7Ü, øĨ1Ü) '
>ȡ
†r€r Gr
†r€r l*+pV=¯²¬´r
ȓŸ§Ø- 200Hz17 kHz ,ĖĐík{F^aFT'
best-matching HRTF(Ďǧ,I~g|XFgh[_k|
>ȡ¾ź,ļƜȓêyix-ȠLjȜƻ,Č×,õƼǹ±
BƇ bFa~vxµƆ'9Ƞ؎ HRTF ( FEC h[
Ô' 63 dB SPL ( ȡ…ƼȆŏȆč;/…ƼȆyix
_k|BƇ ðÚ(34ÛŢ+¿ň;/ġň1,ȓ
č-Vz+ǖý ȡ¾ź,ļƜŏȆ- 1.2 s (ƣ€=Ƞ
­½ĤÕƾ'
>(ǒ>ȡ?+ ITD BưÚ>
ƣ=?? 0.1 s BÞ7) '
>
(+;=ȠŬĔȒ',ȓ­½ĤÕƾ(*>ȡ
‡r€r %T7Dr
LjȜƻX~N[^ňÝBĻŵ>(BǾ> 8Ƞ
çƦňŰ+-n[d|MŰBƇ ȡLjȜƻ-a~^ PC
,ƊȒ€,Ŧ†ȒBƜ´â€+Ƞȓ­ňÝBSXFvS
j|'ZG[L ȡȖ³ý™ ðÚ-ZG[Ll[L
S+ÈB±? ȡ¾ź-v|Yp*ȕ+ļƜȠÙLjȜƻ
-Ù¾ź+$& 10 ç$çƦ ȡ
{x~x{ +pV=r
ÙLjȜƻ,þȜƱŜBµƆňŰ(+é 3 +Ɯȡ
‚r€r K7DÉr s™˜‡†„tr
¿ň- OKA Bȋ 7 ÜƓţňÝ+ƙǍȠġň'MKIȠASK Bȋ 6 ÜƓţňÝ+ƙǍ ȡ !Ƞ
OIS -ė!¿ġǝºý ȡ“ȉȠ,µƆňŰ'Ɠ
ţňÝ+ƙǍ ȨÜ;/ȧÜ+$&ũǭ>ȡ
ƒr€r K7DÊr s™˜Š‹†‰tr
h[_k|B FEC <Ďǧ,I~g|XFg+ôŒ
(@Ƞ¿ň'-Ȩ܆ TTK BȋȧÜƓţňÝ+
ƙǍȠġň'-ȧ܆ OKA BȋȦÜƓţňÝ+ƙ
Ǎ
|x l'¯_^.r
€+DZ2 bFa~vxµƆňŰ'µƂ2Ëȓð
BǖýȠËȓð',ÇǜˆǑėBŭ8 ȡ
|xzx +p7Dr
|xzxz l'r
÷ċ<-Ƞ7 }Ŕ+=ýŏłDzȓ (dDaőą*
„Ƌ) BȢŘ,žĶÝĨnFLzk|'ÑȄȠLzS
SjL^xŰ'±Ąȓ,ŏȆƑšǵBŭ8&>[3]ȡ
,†<ȠǏŵŽ M03 (ąȃŒĎ) +&ūǦř•,ƍ
*>Ȥŋ¸,ȓðBǽC! (ȓð 1-3)ȡ±ĄňÝ-¼Ǻŏ
Ȇ+ăħ>úĈBëé<ǟ6Ò>(+;=ŭ8 ȡ
Ó ƽ ƻ , Ý - Ƞ BMLD (Binaural Masking Level
Difference)[13]ą*>Ƞ*A"±Ąȓ,ªňǐ,
(ÅB0(&ŏǓ
Ƴă©,äą*>ňÝ(
Ě=+ 22°)ȡ<+Ƞȓð 3 (ŏȆƑšǵ-Û'Óƽƻ
,Ýƍ*> (BMLD ÷*>) ȓð 4 BÂ ȡ
dž 3 +Ùȓð,±ĄȓšǵBƜȡ'Ƞ±Ąȓ,ň™
ǐ-Óƽƻ<6 ©'
>ȡ
„r€r K7DËr s‘“›œw—œ’•–˜”Š‹†‰tr
h[_k|+ÂȠHRTF B best-matching HRTF +ôŒ
[ |r l'¯?3r
(@Ƞ¿ň'-Ȩ܆ ASK Bȋ 6 ÜƓţňÝ
音場番号/受聴者の向き/測定日/気象�
+ƙǍ ȡ !ȠMKI ,çƦ-::.<$ ȡġ
ň'-ȧ܆ MMT BȋȦÜƓţňÝ+ƙǍ Ƞ
入射音�
OIS -::.<$ ȡ
…r€r K7DÌr sˆ‚ŽŠ‹†‰tr
HATS , HRTF '-Ƞ
ĢŚ,ƚơ'ĶĿ?&>;
+ȝȗė'¿ġǝºýƏƆ ȡ¿ň-Ȩ܆ȤÜ
ƓţňÝ+ƙǍ Ƞŧ=ȥ܆ȤÜ-ġň+ȠȢ܀ň+ƙǍ ȡġň'-ȧ܆ȥÜƓţňÝ+ƙǍ
ȠȣÜ-¿ň;/€ň+ƙǍ ȡ
相対遅れ時間 (ms)�
1 相対振幅�
方位角(°)�
相対遅れ時間�
2 相対振幅�
1�
2�
3�
4�
22°�
22°�
22°�
71°�
2013.9.7�
2013.12.19�
曇り�
雨�
曇り�
北東�
北西�
南東�
1.6 m/s�
1.1 m/s�
1.9 m/s�
0�
0�
0�
1.00�
1.00�
0.60�
11�
11�
-�
941�
-�
0.81�
方位角�
-�
345�
相対遅れ時間�
-�
-�
3 相対振幅�
-�
-�
方位角�
-�
-�
相対遅れ時間�
-�
-�
-�
-�
-�
-�
4 相対振幅�
方位角�
2013.9.10�
11�
322�
443�
1.00�
178�
129�
564�
0.98�
101�
52�
745�
0.81�
322�
273�
±Ąȓ,ķēâűŃƀĨ+$&-ȠŐțȓ*),ĞȔ
~|BǓ 4 ÖưÚ&Sd~JƹBšĭ&> 8ȠÙ
'LzSSjL^xŰ'-Ŧƛ+ŭ8<?* 8ȠúĈ
Sd~J,Ý(™ƸBƺĬ&Sd~Jƹ,ňÝ»F
(ÛXFg,Sd~J (z|Mk~|ȩUNI-PEX H510LȠ
|cxSħƦBÚĭ ȡ<+Ƞ100 Hz “€, 1/3 IL
yeyLSk~|ȩÛ H510A) ,ƀĨB‘Â ȡ?
X~fb|_+&ȠǏŵŏ,ūŴȠƕăŶė;/˜
<,Sd~J,ňÝ»F|cxSħƦ (ŬĔȒ 2.5°ȆȎ)
ľǩȏ;=ŭ8 ƢūßÑ+;>ųLJȂ[14]BÐŎ ȡ
BžȔÿ'ŵýȠúĈ'-z|Mk~|(yeyLSk
TTK
MRT
CKT'
OIS'
MMT'
MKI'
ASK'
OKA'
own_FEC
180
90
0
0
180
0
180
0
180 0
180
0
180 0
180 0
180 0
180
0
180
0
180 0
180
0
180 0
180 0
180 0
180
0
180
0
180 0
180
0
180 0
180 0
180 0
180
0
180
0
180 0
180
0
180 0
180 0
180 0
180
own_OPEN
Perceived'ver)cal'angle'[deg.]
180
90
0
0
180
bm_OPEN
180
90
0
0
180
HATS_OPEN
180
90
0
0
180
Target'ver)cal'angle'[deg.]
3"
|xzx{ +pº»½Ãr
Ƙď ȡ,ġŲŻȠçƦ+ĦNj*İ®,Ż=!+
ȓð 1-4 BžȔÿ³'µƂ ȡdž 3 +Ɯ Ùň™ǐ
+Sd~J (FOSTEX FE83E) BǖƸ
(é 4)ȡLjȜƻ
&þȜBþʼn ȡÙ¾ź'-Ƞ5ŐțȓBàƜȠ
2 s ġ+ 4 ǶÇǜBàƜ
(é 5)ȡ¾ź,àƜŏȆ- 8 s
,Ȗǿ†ĥ<Sd~J5',ǩȏ- 1850 mm '
>ȡ
'
>ȡLjȜƻ,XSL-Ƞ¾ź,àƜƯˆ&<
<+ȠŐțȓàƜƇ(&45°Ƞ135°+Sd~JB
20 s Ȇ+ȠƽÒ? ²&,ÇǜBçƦƇƭ+Ǖ±Ƞƽ
ǖƸ ȡ
ÙSd~J-FOvFQ' 200 Hz-16 kHz , 1/3
Ò=+B 4 Ũȍ (1: ƽÒ=+-*Ƞ2: :
ILX~fb|_yix1 dB (*>;ǡń ȡ
:ƽÒ=+Ƞ3: *=ƽÒ=+Ƞ4: ȑĒ+
ƽÒ=+) 'çƦ>('
>.
2s
#
(FireFace#UFX)
281.25ms
DA#
(YAMAHA#DA824)
PC#
(EPSON#NJ5900E)
(20s)
#(8s)
& ~r G¯8iN?3r
#
(YAMAHA#Q2031B)
r
#
(YAMAHA#HC1500)
|x{x +pV=r
|x{xz _^.r
#
ȓð(+ŭ8
4 ǶÇǜ,ÇǜˆǑėBé 6 +Ɯȡ
& }r +pº»½Ãr
ÇǜˆǑė-ȓð 1 'œ÷ (0.77)Ƞ
ȓð 2 'œą (0.46) '
r
# ȡȓð 3 ( 4 -34Û©'
# ȡ?<,čƍ
|xzx| Gr
¾ź- 4 ǶÇǜ(Őțȓ+;=šĭ ȡ4 ǶÇǜ-Ƞ
ǎĂė»ÇǜˆǑėǙȜƇȓó]~XU[^ (FW03)[15]
+ÑȄ?&>øĨǚƻ fto ,ǎĂė 7.0-5.5 +Ċ> 4
r~v,ÇǜB 1.5 r~v (281.25 ms) ȆȎ' 4 $Ʒ&
Ÿĭ ȡ, 4 ǶÇǜ+¿DZ,Sd~Jƹ,F|cxS
ħƦBƎǯ6ȠƢūßÑ+;>ųLJBʼnȠdž 3 ,ƕăǸ
?ŏȆ(ƕăķēBÐŎ&àƜ ȡ
+$&JF‹‡şýBDž# ƱŜȠȓð 3-4 ȆBȋ²
&,ȓðȆ+ŕĪ*č (p<0.01) # ȡ
|x{x{ Z£¶®¤¦r
ƽÒ=++$&9Ƞȓð 1 'œą (1.1) Ƞȓð
2 'œ÷ (2.9) (*=Ƞ
ƽÒ=+-*(
*=ƽÒ=++ƕĜ>ǻ
# (é 6)ȡ
Ƞȓð 3 ( 4 - 2.7 ( 2.5 '
=ȠÓƽƻ,Ý+;
>ĞȔ-÷(-ǒ*ȡ
Őțȓ-ÙȓðǏŵŏ,9,B¡ƇȠžƕȇ(*>;
+-45°,Sd~J,ǸĘB 0 (&ŏǓĚ=+ 150, 450,
300 ms ,ǸĘBƒ ȡ
1.0$$
0.9$$
;/Őțȓyix-ȠƂð',Ǐŵ© (dž 4) BµƂ ȡ
音場�
1�
信号＋暗騒音(dB)� 暗騒音(dB)� （信号＋暗騒音）／暗騒音(dB)�
54.8�
47.9�
[ }r ¡µ±9ol¯]Fr
0.8$$
2.9$$
0.65$
0.6$$
2.7$$
0.46$
0.5$$
0.64$
2�
58.2�
54.6�
3.6�
0.2$$
3, 4�
56.5�
48.9�
7.6�
0.1$$
0.0$$
4$$
3$$
2.5$$
0.4$$
0.3$$
2$$
1.1$$
1$
|xzx} G¯$R7D¡µ±%T7Dr
LjȜƻ-ŽŻ žȔÿ'ŦȒňÝBƜÈ+Ý&
0.77$
0.7$$
6.9�
r
& r
2$
3$
4$
l'¯_^.¬Z£¶®¤¦r
1$$
Ùȓð,Ȗǿ†ĥ™Ƹ', (§ØȟŐțȓ) yixȠ
}xzx G¯$R7D¡µ±%T7Dr
|x{x| ²¬´r
ÛëŽ'Ǐŵ ūǦř•,ƍ*>ȥȓðBžȔÿ
ŲŻ Ȉȓÿ'çƦ+ĦNj*İ®,Ż=!+&
+ǖýȠÇǜˆǑė(ƽÒ=+Bŭ8 ȡ,Ʊ
þȜBDž# ȡ¾ź,àƜňŰ;/çƦňŰ-h[_k
ŜȡūǦř•+;=ÇǜˆǑė+ƲǓƑŕĪ*čƆȠ
|'ļƜ>(Bȋ |xzx} (ÛŢ'
>ȡ
ƽÒ=+9ƍ*# ȡťƤ'-Ƞ,ȥȓðBËȓ
}x{x +pV=r
ð(&bFa~vxµƆBDžȠÇǜˆǑė;/ƽ
}x{xz _^.r
Ò=+,µƂƫėBşǗ>ȡ
ÇǜˆǑėBdž 5 +Ɯȡ|x{xz ,Ëȓð,ƱŜ9 (@'Ƞȓð 3 ( 4 ,Ȇ+-ȠÇǜˆǑė+&9
&Ɯȡ?,bFa~vxµƆ+&9ÇǜˆǑė
ƽÒ=++&9șǃ*č-6<?*# ȡĢ
-Ëȓð;=ȝȠÉȌª,ƱŜ(*# ȡȓðȆ,čƍ
Ś, BMLD ,ƙnj<?.ȠÇǜˆǑė:ƽÒ=+
+$&-Ƞȓð 2 < ȓð 3≅ȓð 4 < ȓð 1 (*=ȠË
+ġƴȓ,±ĄňÝ,ĞȔƂ?>(ƺ<?>ȡ
ȓð(ÛŢ,¬Ý'
#
,Ž+$&-Ƞ;=R|gx*ȓðBƇ þȜBDž#
FEC_own ( OPEN_bm +&-Ëȓð(ŕĪ*č-Ǜ
,'Íſ? [16]ȡ
}x
À¹¿ÇÄÅK®µ·l'¯l(^.¯
ȡJF‹‡şý,ƱŜȠ
8<?*# ȡ
[~r À¹¿ÇÄÅK®µ·_^.Èu¡µ±uu°l'«
¯_^.¯i®r šyxy~vršyxyz «:2­-¢Ÿ·¥¬¸R©Èr
IU.r
ȣƤ'DZ2 bFa~vxµƆňŰ'ȤƤ,ȥƠȚ,
バイノーラル再生�
音場�
原音場�
ËȓðBRouy~^ȠÇǜˆǑė,µƂƫėBşǗ
ȡ
}xzx +p7Dr
}xzxz l'r
ȤƤ'DZ2 ȓð 1-4 BRouy~^ ȡ
}xzx{ +pº»½Ãr
{x~xzr‚ (ÛŢ'
>ȡ
}xzx| K7Dr
{x~xzrƒ (ÛŢ'
>ȡ
}xzx} \pXr
own_FEC�
own_OPEN� bm_OPEN� HATS_OPEN�
1�
0.77�
0.80�
0.83�
0.81�
0.84*�
2�
0.46�
0.51�
0.54*�
0.47�
0.50�
3�
0.65�
0.66�
0.70�
0.70�
0.71�
4�
0.64�
0.65�
0.71�
0.70�
0.74**�
}x{x{ Z£¶®¤¦r
ƽÒ=+Bdž 7 +Ɯȡ?,bFa~vxµ
Ɔ+&9ȠËȓð(,č-œ÷' 0.3 '
# ȡȓð
Ȇ,čƍ+$&-Ƞȓð 1 < ȓð≅ȓð 4 < ȓð 2 (*
=ȠËȓð(ÛŢ,¬Ý'
# ȡ
{x~xzr… (ÛŢ'
>ȡ
[ r À¹¿ÇÄÅK¡µ±l'¯Z£¶®¤¦r
}xzx~ Gr
|xzx| (ÛŢ,ňŰ'Ÿĭ ¾ź+ȖǿF|cxSħ
Ʀ (HRIR) BŏȆǬ€'ƎǯC'àƜ ȡ !Ƞ|xzx|
(-ƍ*>ȓóU[^BƇ ȡ
Ù±ĄȓňÝ+ăħ> HRIR BƇ>,'-*Ƞ
{x}
'DZ2 ;+¿ň (0°) ;/ġň (180°) , HRIR +
バイノーラル再生�
音場�
原音場�
own_FEC�
own_OPEN� bm_OPEN�
HATS_OPEN�
1�
1.1�
1.1�
1.2�
1.2�
1.3�
2�
2.9�
3.2�
3.1�
3.2�
3.2�
3�
2.7�
2.5�
2.6�
2.5�
2.4�
4�
2.5�
2.6�
2.7�
2.4�
2.3�
ITD B‘Â>ňŰBƇ ȡITD -ě(2)'ƒ [17]ȡ
𝐼𝐼𝐼𝐼𝐼𝐼 = 𝐷𝐷
𝜙𝜙 + sin 𝜙𝜙 (2)
2𝑐𝑐
' c -ȓǴȡ
D -…ƼȆǩȏ'
=Ƞ
210mm ( ȡ
~x W,r
~xzx À¹¿ÇÄÅK¯_^.¢l'µ¶q
"¸R§ªJMr
bFa~vxµƆ'-ȥƠȚ,2&,ňŰ'ȠÇǜˆ
ǑėËȓð;=ȝ©BƜ
(dž 5)ȡ?-ȓðǘ¤
ÇǜˆǑė+$&ȩ
ȢȞ?,bFa~vxµƆ+&9Ëȓð;=::
ȝȠÉȌª,ƱŜ(*# ȡ
,ǏŽ<?.ÉȌª,ƱŜ'
>ȡ
,;*čƆ Ƅƈ(&Ƞȓ­ǩȏ,ųĆƺ
ȣȞȠbFa~vxµƆ+>ȓðȆ,čƍ+$
<?>ȡǀƑ+ȠbFa~vxµƆ'-Ëȓð;=9
&-Ƞȓð 2 < ȓð 3≅ȓð 4 < ȓð 1 (*=ȠËȓð
ȓ­ǩȏǰ*>¬Ý
=ȠŽ: HATS *),
(ÛŢ,¬Ý'
# ȡ
HRTF BƇ>(ȗƶ+Ȗ³ý™B>ȡȓ­ǩȏǰ
ȤȞJF‹‡şý,ƱŜȠ؎ HRTF ;/ FEC h[_
*>('ÇǜBƙǍ:*# ÕƾĨ
>ȡ
k| (ËƄdz=,ƄĩRS\p)+;>bFa~vxµƆ
ȠƽÒ=+,ƱŜB6>(ȠËȓð;=bFa~
( best-matching HRTF (I~g|XFgh[_k|BƇ
vxµƆ,ňš(¬Ý-6<?*#
(dž 6)ȡ
~x{x 7"¸#³ËAl'¯Ir
Řƚơ'-ȠúĈ<ŃƐq~^xȏ? ÓƽŽBǖý
8Ƞ±Ąȓ-ŬĔȒ<¼Ś>(( Ƞú
Ĉ(,ǩȏƵ5>(”ǐBÐŎ>ĦNj
>ȡ
Saberi et al. [18]-ŦȒ<¼Ś>d|LaFTBùā
ȓȠŬĔȒ9-Ŧ†Ȓ,ȢňÝ<¼Ś>Lw[L
bFa~vxµƆ (Řƚơ'ļŝ þƇRS\p)
+&-ȠËȓð(ŕĪ*č-Ǜ8<?*# ȡ
ƽÒ=++$&ȩ
ȥȞ
bFa~vxµƆ(Ëȓð,č-œ÷'0.3 '
# ȡ
ȦȞbFa~vxµƆ+>ȓðȆ,čƍ+$&-Ƞ
ȓð 1 < ȓð≅ȓð 4 < ȓð 2 (*=ȠËȓð(ÛŢ,¬
Ý'
# ȡ
ȓBƓƑȓ(&Ƞ
MLD (Masking Level Difference)Bŭ8Ƞ
ŦȒňÝ,ƓƑȓ(ũǭ&Ƞªň:€ň'- MLD €
Ō>(BƜ ȡ$5=Ƞ¿ġňÝ;=€ň<¼Ś
>§Ø,3ƽÒ=:ȡ
bcr
Řƚơ,ǿ-ŅƞƖƝƣ÷üĮƌƑƚơîƒĝĭŁ
ĽŠŠ(S1311003)+;=þʼn ȡ
ňȠ݌<[16]-ŦȒ<°DžȓȠŦ†Ȓ³,ȢňÝ
<ÇHO~¼Ś>ȓð'ÇǜˆǑėþȜBDž#
ȠHO~,¼ŚňÝ+;>ŕĪč-Ǜ8<?Ƞ7
@€ň<¼Ś>ðÚ,3ˆǑė-š*>¬Ý
nj<? ȡ,ǻ-ȠSaberi et al.,þȜ'-Lw[L
ȓƓƑȓ'
>Ƞ݌<,þȜ'-°Džȓ(ÇHO
~,ÏňƓƑȓ(*=ģ> 8!(ƺ<?>ȡ
,;+ȠHO~,±Ą”ǐÇǜˆǑė+Î4Ğ
Ȕ+$&-şǔ,žëŧ#&>ȡ
x
Var
؎, HRTF Bĵ *ǀ,Óƽƻ+ăȠĉõȈ
żłDz,ÇǜˆǑėBƫėǁµƂ>(BƓƑ(
W6Hr
[1] DŽŒ, §üIJï, EA201354, 2013.
[2] Ā, §üIJï, EA201421, 2014.
[3] ÷ċ, țȓƚǨņ, N201425, 2014.
[4] ąȁԐ, §üIJï, EA201412, 2014.
[5] ސ, țȓ½Ĥ, 38 (2), 123131, 2014.
[6] Wightman and Kistler , J. Acoust. Soc. Am. 85 (2), 868–878, 1989.
[7] Iida et al., J. Acoust. Soc. Am. 136 (1), 317–333, 2014.
[8] Iida et al., Applied Acoustics, 68, 835-850, 2007
[9] http://www.iida-lab.it-chiba.ac.jp/e/
[10] Morimoto et al., Acoust. Sci. Tech., 24 (5), 267275, 2003ȡ
bFa~vxµƆňŰBļŝ ȡ
[11] Āؐ, ȓǣǢ, 605-608, 2014.9.
ļŝŰ,ƫėBşǗ> 8Ƞ5Ëȓð(&Ûë
[12] Møller, et al., J. Audio Eng. Soc. 43, 203-217, 1995
Ž'Ǐŵ ūǦř•,ƍ*>ȥȓðBžȔÿ+ǖýȠ
[13] Blauert , Spatial Hearing, The MIT Press, 257-271, 1983.
ÇǜˆǑė(ƽÒ=+Bŭ8 ȡ<+Ƞ,Ëȓ
[14] ISO 9613–1:1993.
ðBļŝŰ'bFa~vxµƆ&ȠÇǜˆǑė(ƽÒ
[15] NII ȓóǨŸO|W~RDp, 2006.
=+Bŭ8Ƞ“,ƱǢBģ ȡ
[16] ݌ȠęƩȓȔƚơ—Ǩņ, AA2015-, 2015.