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What is ‘Hibiki’? 「響き」とは何か? Workshop 4, 14:15 - 15:45 (90min), July 24 AES 14th Regional Convention, Tokyo 2009 Toshiki HANYU (Nihon Univ.), Akira OMOTO (Kyushu Univ.), Toru KAMEKAWA (Tokyo Univ. of the Arts), Kazutsugu UCHIMURA (NHK-MT) Introduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学 ), 尾本章(九州大学 ), 亀川徹(東京藝術大学), 内村和嗣(NHK-MTChaired by Masataka NAKAHARA ( SONA / ONFUTURE ) 座   中原雅考(ソナ / オンフューチャー)

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Page 1: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

What is ‘Hibiki’?「響き」とは何か?

Workshop 4, 14:15 - 15:45 (90min), July 24AES 14th Regional Convention, Tokyo 2009

Toshiki HANYU (Nihon Univ.), Akira OMOTO (Kyushu Univ.), Toru KAMEKAWA (Tokyo Univ. of the Arts),

Kazutsugu UCHIMURA (NHK-MT)

Introduction to Spatial Audio Conference, Tokyo 2010

羽入敏樹(日本大学 ), 尾本章(九州大学 ),

亀川徹(東京藝術大学), 内村和嗣(NHK-MT)

Chaired by Masataka NAKAHARA ( SONA / ONFUTURE )座   長 : 中原雅考(ソナ / オンフューチャー)

Page 2: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

Panelists

K

U

H

O

Prof. Dr. Toshiki HANYU ( Nihon University )羽入敏樹 日本大学 短期大学部 建築学科 准教授

Prof. Dr. Akira OMOTO ( Kyushu University ) 尾本章 九州大学 芸術工学院 准教授

Prof. Toru KAMEKAWA ( Tokyo University of the Arts)亀川徹 東京藝術大学 音楽学部 音楽環境創造科 准教授

Kazutsugu UCHIMURA ( Sound Designer/Mixer, NHK-MT )内村和嗣 NHKメディアテクノロジー チーフ・エンジニア

Chaired by Dr. Masataka NAKAHARA ( SONA / ONFUTURE )座   長 : 中原雅考 ソナ / オンフューチャーN

Page 3: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

What is ‘Hibiki’? - Introduction -

Reflections = Reverberation ?

Direct Sound(Dry)

Early Reflections(Delay)

Late Reflections(Reverberation)

time30, 50, 80 ms

Page 4: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

1. What does IR tell us? -Leading-egde technologies and their restrictions -インパルスレスポンスから何が分かるか? ~最新の科学と限界~

K H

O

U

• Measured IRs

Analyze the IRs and estimate the roomproperties.

K

H OCreate Sounds using artificial reverberators

2. What is the key for spacial information? 何が空間らしさを創りだしているか?

Analyze the physical characteristics of the reverberators.

KUH O3. Discussion • Acoustical keys of Hibiki

• Reality vs Physical Data• Directions and Channel Assign ...

Shows the• Recorded Music• Room Properties

Analyze the IRs and estimate the roomproperties.

{ Question }

{ Answer }

!?

Signal Processing vs Real World.

!?

Keys for the reality of Hibiki.

Page 5: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

1. What does IR tell us?

[1] Question from Prof. Kamekawa.

Page 6: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

WS4 What is “Hibiki” ?Toru Kamekawa

Tokyo University of the Arts

2009年7月29日水曜日

Page 7: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

Sample 1

2009年7月29日水曜日

Page 8: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

Sample 2

2009年7月29日水曜日

Page 9: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

Sample 3

2009年7月29日水曜日

Page 10: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

Sample 4

2009年7月29日水曜日

Page 11: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

Sample 1

Sample 2

Sample 3

Sample 4

IR Samples

2009年7月29日水曜日

Page 12: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

Can you imagine the space from the IR samples ?

2009年7月29日水曜日

Page 13: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

1. What does IR tell us?

[2] Answer from Prof. Hanyu.

Page 14: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

No.1 No.2

No.3 No.4

500 ms

500 ms

500 ms

500 ms

Page 15: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

Outline of impulse response<Influence of room size>

Level 

time

Small room

Level 

time

Large room

Page 16: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

Outline of impulse response<Influence of wall material>

Level 

time

Reflective wall

Level 

time

Absorptive wall

Page 17: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

Level 

time

Near point

Outline of impulse response<Influence of receiver distance>

Level 

time

Far point

Page 18: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

No.1 No.2

No.3 No.4

Small Room

Large Room Small Room

Medium Size

500 ms

500 ms

500 ms

500 ms

Outline of impulse responses

Page 19: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

No.1 No.2

No.3 No.4

100 ms

100 ms

100 ms

100 ms

Details of impulse responses

Page 20: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

No.1 No.2

No.3 No.4

50 ms

50 ms

50 ms

50 ms

6 ms(2m)

6 ms(2m)

6 ms(2m)

4.85ms(1.65m)

12.5 ms(4.1m)

12.5 ms(4.1m)

12.5 ms(4.1m)

FloorHeight:1.7 ‐ 1.8m

24.5 ms(8.3m)

35 ms(12m)

14.7 ms(5.0m)

Small Room

Large Room? Small Room

Medium Size

Details of impulse responses

Ceiling height > 7m Scattered by objects on the floor ?床からの反射音が拡散されている?

Page 21: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

No.1 No.2

No.3 No.4

Reverberation time

Rev. Level : 1.3dB

Rev. Level : ‐1.3dB

Rev. Level : 2.2dB

Rev. Level : 3.7dB

Rev. Time : 0.9s

Rev. Time : 1.1s

Rev. Time : 0.3s

Rev. Time : 0.4s

Page 22: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

No.1 No.2

No.3 No.4

Decay curves at 125Hz octave band

Page 23: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

No.1 No.2

No.3 No.4

Decay curves at 63Hz octave band

Page 24: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

No.1 No.2

No.3 No.4

Power spectrum

Page 25: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

No.1 No.2

No.3 No.4

100 ms

100 ms

100 ms

100 ms

My answers are

Small room

Large spaceOpen space

Small room

Medium size

Atrium(吹き抜け空間)Courtyard(中庭)

Small Hall(小ホール) Studio(スタジオ)

Class room(教室)

Page 26: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

1. What does IR tell us?

[3] Answer from Prof. Omoto.

Page 27: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

Workshop 4: What is ‘Hibiki’?Introduction to Spacial Audio Conference Tokyo 2010AES 14th Regional Convention, Tokyo 2009

2009TOKYO

What is ‘Hibiki’- Room Profile Estimation by Impulse Responses

- Impulse Response Analysis of Reverb Effector

Akira OmotoFaculty of Design

Kyushu University尾本 章

九州大学 芸術工学研究院

Page 28: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

Workshop 4: What is ‘Hibiki’?Introduction to Spacial Audio Conference Tokyo 2010AES 14th Regional Convention, Tokyo 2009

2009TOKYO

Impulse Responses Measured at Four Different Conditions

ir-1

ir-2

ir-3

ir-4

Page 29: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

Workshop 4: What is ‘Hibiki’?Introduction to Spacial Audio Conference Tokyo 2010AES 14th Regional Convention, Tokyo 2009

2009TOKYO

Analysis

Primitive Method based on Geometry

Source (0,0,0)

Receiver (0.5, y, z)

Image (0,0,-2.4)

n1

n2

d1= n1 / fs * cd2= n2 / fs * c

0.52 + y2 + z2 = d12

1.2 m

0.52 + y2 + (z+2.4)2 = d22

Page 30: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

Workshop 4: What is ‘Hibiki’?Introduction to Spacial Audio Conference Tokyo 2010AES 14th Regional Convention, Tokyo 2009

2009TOKYO

Analysis

Reverberation Time by Schroeder Integration

!"#!$%

"%%

"#%&!#

'%%

#%%$&%

(%%

!%%%!"#%

!$%%

"%%%"#%%

&!#%

'%%%#%%%

$&%%

(%%%!%%%%

!"#%%

!$%%%%

%)"

%)'

%)$

%)(

!

!)"

!)'

!)$

*+,-.,/0123456

7,8,+9,+:;<=/2><?,23@6

ir-1ir-2ir-3ir-4

Page 31: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

Workshop 4: What is ‘Hibiki’?Introduction to Spacial Audio Conference Tokyo 2010AES 14th Regional Convention, Tokyo 2009

2009TOKYO

Results

ir-1

direct: 2.13 m

floor: 4.4 m

ceiling: 8.29 mfront wall: 8.52 m

left wall: 10.0 m

right wall: 11.1 m

back wall: 12.8 m

???

Page 32: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

Workshop 4: What is ‘Hibiki’?Introduction to Spacial Audio Conference Tokyo 2010AES 14th Regional Convention, Tokyo 2009

2009TOKYO

Results

ir-1

!"#$%&

'#(%&

!"#)%&

*+,-./

0/./12/-

V = 670 m3

S = 474 m2

T = 1.0 sec

α = 0.23

Page 33: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

Workshop 4: What is ‘Hibiki’?Introduction to Spacial Audio Conference Tokyo 2010AES 14th Regional Convention, Tokyo 2009

2009TOKYO

Results

ir-2

direct: 2.1 m

floor: 4.4 m

ceiling, front wall: 4.6 m ??

left wall: 5.0 m

right wall: 6.0 m

back wall: 9.3 m

Page 34: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

Workshop 4: What is ‘Hibiki’?Introduction to Spacial Audio Conference Tokyo 2010AES 14th Regional Convention, Tokyo 2009

2009TOKYO

Results

ir-2

V = 154 m3

S = 175 m2

T = 0.3 sec

α = 0.47

!"#$%

&"'$%

("($%

)*+,-.

/.-.01.,

'"2$%

3"'$%

4"5$%

Page 35: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

Workshop 4: What is ‘Hibiki’?Introduction to Spacial Audio Conference Tokyo 2010AES 14th Regional Convention, Tokyo 2009

2009TOKYO

Results

ir-3

direct: 2.13 m

floor: 4.4 m

side walls with diffuser?9.4 - 11.5 m

front wall: 12.1 m

back wall: 13.6 m

Page 36: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

Workshop 4: What is ‘Hibiki’?Introduction to Spacial Audio Conference Tokyo 2010AES 14th Regional Convention, Tokyo 2009

2009TOKYO

Results

ir-3

V = 840 m3

S = 548 m2

T = 1.2 sec

α = 0.20

!"#$%&!"#'%&

(#)%&

*+,-./

0/./12/-

!#"%&

3#!%&

4155,6/7

Page 37: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

Workshop 4: What is ‘Hibiki’?Introduction to Spacial Audio Conference Tokyo 2010AES 14th Regional Convention, Tokyo 2009

2009TOKYO

Results

ir-4

direct: 2.13 m

floor: 3.2 mleft wall: 2.8 m

right wall: 3.7 mback wall: 4.4 m

ceiling: 2.2 m

Page 38: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

Workshop 4: What is ‘Hibiki’?Introduction to Spacial Audio Conference Tokyo 2010AES 14th Regional Convention, Tokyo 2009

2009TOKYO

Results

ir-4

V = 20.4 m3

S = 45.7 m2

T = 0.4 sec

α = 0.18

!"!#$

%"&#$

%"%#$

'()*+,

-,+,./,*

0"%#$

0"1#$

0"2#$

Page 39: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

1. What does IR tell us?

[4] True Answer from Prof. Kamekawa.

Page 40: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

Recording Samples

2009年7月29日水曜日

Page 41: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

Performance

• エネスコ 幼き頃の印象

• バイオリン独奏 佐原 敦子

Violin Solo : Atsuko Sahara

2009年7月29日水曜日

Page 42: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

Sample 114.8m

14.8m

7.3m

v=1,060m3

S=700m2

(SFloor=170m2)

11.7m

DPA4006

DPA4006

CMC68

CMC62

CMC62

5.5m

1.4m2m

2m

2.9m 2.6m

source

receiver for IR measurement

source

receiver for IR measurement

2009年7月29日水曜日

Page 43: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

Sample 1v=1,060m3

S=700m2

(SFloor=170m2)

2009年7月29日水曜日

Page 44: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

Sample 2

6.85m

6.85m

4.5m

v=1,060m3

S=217m2

(SFloor=47m2)

DPA4006

DPA4006

CMC68

CMC62

CMC62

1m

1.4m2m

2m

2.9m 2.6m

6.85m

source

receiver for IR measurement

receiver for IR measurement

source

2009年7月29日水曜日

Page 45: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

Sample 2v=1,060m3

S=217m2

(SFloor=47m2)

2009年7月29日水曜日

Page 46: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

Sample 3

23m

15m

10m

v=3,450m3

S=1,440m2

(SFloor=340m2)

DPA4006

DPA4006

CMC68

CMC62

CMC62

5.1m

1.4m2m

2m

2.9m 2.6m

source

receiver for IR measurement

receiver for IR measurement

source

2009年7月29日水曜日

Page 47: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

Sample 3v=3,450m3

S=1,440m2

(SFloor=340m2)

2009年7月29日水曜日

Page 48: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

Sample 4

7m

4.5m2.6m

v=82m3

S=123m2

(SFloor=31.5m2)

DPA4006

DPA4006

CMC68

CMC62

CMC62

0.8m

1.2m2m

2m

2.15m 2.1msource

receiver for IR measurement

source

receiver for IR measurement

2009年7月29日水曜日

Page 49: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

Sample 4v=82m3

S=123m2

(SFloor=31.5m2)

2009年7月29日水曜日

Page 50: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

14.8m

6.85m

6.85m

23m

15m

7m

4.5m

11.7m

23m

15m

Sample 1 Sample 2

Sample 3 Sample 4

14.8m

2009年7月29日水曜日

Page 51: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

14.8m

7.3m4.5m

10m 2.6m

23m

6.85m

7m

Sample 1Sample 2

Sample 3Sample 4

2009年7月29日水曜日

Page 52: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

2. What is the key for spacial information?

[1] Hibiki & Mixing Works.Thought & Demo from Mr. Uchimura.

Page 53: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

What is HIBIKI ?

Page 54: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

What is HIBIKI ?

• Reverberation

• Ringing

Page 55: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

What does HIBIKI express?

• Fixed place/scene

• Ambiguous place/scene

• Character of material

• Sense of distance

• Amount, Density

• Focus

• Attractively, Sexy

• Undesirable

• Linked a pitch change

• Linked a gain change

• Linked a position change

• Envelopment, Security

• Enhanced psychological meaning

• Surprising, Amazing, Startling

• Dark image

Page 56: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

What is HIBIKI ?

• Digital Reverberator

- Level

- Frequency

- Time

Page 57: Introduction to Spatial Audio Conference, Tokyo …aes-japan.org/special/aes2009/AESTC09_WS4_hibiki.pdfIntroduction to Spatial Audio Conference, Tokyo 2010 羽入敏樹(日本大学

Equipment & Parameters of Demo Clip

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2. What is the key for spacial information?

[2] What does the reverberator create?Examination from Prof. Omoto.

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Workshop 4: What is ‘Hibiki’?Introduction to Spacial Audio Conference Tokyo 2010AES 14th Regional Convention, Tokyo 2009

2009TOKYO

What is ‘Hibiki’- Room Profile Estimation by Impulse Responses

- Impulse Response Analysis of Reverb Effector

Akira OmotoFaculty of Design

Kyushu University尾本 章

九州大学 芸術工学研究院

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Workshop 4: What is ‘Hibiki’?Introduction to Spacial Audio Conference Tokyo 2010AES 14th Regional Convention, Tokyo 2009

2009TOKYO

Impulse Responses of Reverb-Effector

L-ch LS-ch

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Workshop 4: What is ‘Hibiki’?Introduction to Spacial Audio Conference Tokyo 2010AES 14th Regional Convention, Tokyo 2009

2009TOKYO

Impulse Responses of Reverb-Effector

0

0.2

0.4

0.6

0.8

1

!"#!$%

"%%

"#%&!#

'%%

#%%$&%(%%

!%%%!"#%

!$%%

"%%%"#%%

&!#%

'%%%#%%%

$&%%

(%%%!%%%%!"#%%

!$%%%

)*+,-+./012345

6+7+*8+*9:;<.1=;>+12?5

L-ch

LS-ch

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2. What is the key for spacial information?

[3] What does the reverberator create?Examination from Prof. Hanyu.

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空間音響Spatial Hearing

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合成音像(Phantom image)

Level

Time

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合成音像(Shifting phantom image)

Level

Time

< 1ms

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第一波面の法則(先行音効果)Law of the first wave front (Precedence effect)

Level

Time

> 1ms

聞こえない

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音像の分離(sound image split)

Level

Time

long delay

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第一波面の法則の上限を超えない場合Below the upper limit of the precedence effect

Level

TIme

第一波面の法則が成立する上限Upper limit of the precedence effect

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第一波面の法則の上限を超える場合Over the upper limit of the precedence effect

レベル

時間

音像が分離するSplit of sound image

第一波面の法則が成立する上限Upper limit of the precedence effect

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第一波面の上限を超えない反射音の効果Effects of reflected sound below the upper limit of the precedence effect

Level

Time

音像の幅が大きくなるBroaden sound image

ラウドネスが増すIncrease loudness

音色が変化するChange tone

絶対検知限

第一波面の法則が成立する上限Upper limit of the precedence effect

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第一波面の法則の上限を超える反射音の効果Effects of reflected sound over the upper limit of the precedence effect

レベル

時間

第一波面の法則が成立する上限Upper limit of the precedence effect

エコー障害の閾値Threshold of echo disturbance

Primary sound image

Secondary sound image

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Listener

ASW

LEV

ApparentSource Width

Listnener Envelopment

空間印象(Spatial Impressions)

みかけの音源の幅

音に包まれた感じ

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第一波面の法則と空間印象反射音レベルが第一波面の法則の上限を超えない場合

反射音レベルが第一波面の法則の上限を超える場合

反射音を知覚出来ない 反射音を知覚できる

第一波面の法則の上限

ASW ASW

LEV

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第一波面の法則と空間印象の関係Relation between precedence effect and spatial impression