Title: An overview of Immersive Audio Sound Systems Dimitris Theodoropoulos Georgi Kuzmanov, Georgi Gaydadj
1An overview of Immersive Audio Sound
SystemsDimitris TheodoropoulosGeorgi Kuzmanov,
Georgi Gaydadjiev
2Presentation outline
- What is Immersive Audio (IA)?
- IA sound-systems categories
- IA applications
- Conclusions
- Preliminary analysis
- Our objective and methodology
Computer Engineering Mekelweg 4 2628 CD
Delft The Netherlands
3What is Immersive Audio (IA)?
- Immersion Addressing all human sensory
subsystems in a natural way. Lentz07 - Immersive Audio The task of producing a
realistic acoustic perception, localization and
identification. Lentz07, Kyriakakis98
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5IA sound-systems categories - Binaural systems
(I)
- Binaural system recording principle Snow55
- 2 microphones inside an artificial head.
- 2 separate audio channels.
(web.media.mit.edu)
6IA sound-systems categories - Binaural systems
(II)
- Head Related Impulse Responses (HRIRs)
Human brain interprets y(t) and decodes sources
location
Incoming signal
x(t)
HRIR(t)
7IA sound-systems categories - Binaural systems
(III)
- Artificial binaural rendering
HRR
HRR
Hd
HR
HR
SR
HRL
Head position sensor
-HRL
-HLR
HLR
HLL
Hd
HLL
HL
HL
SL
x, y, z
HRIRs
8IA sound-systems categories - Binaural systems
(IV)
- Positive aspects
- Easy implementation.
- Good sound localization.
- Negative aspects (without head sensor)
- Rendering through headphones
- Virtual-source follows head rotation.
- Uncomfortable.
- Rendering through loudspeakers
- Limited head rotation.
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10loudspeaker
11dry sources
Room IRs
Wave field synthesizer
to loudspeakers
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13(Institut de Recherche et Coordination
Acoustique/Musique - IRCAM)
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15WFS
Quality
Acoustic curtain
transmission channels
transmission channels
7.1ch stereo
Quality
2 4 8 16 32
2 4 8 16 32
5.1ch stereo
2ch stereo
2 4 8 16 32
2 4 8 16 32
sound sources
sound sources
16f 0.6 KHz
f 1 KHz
Cinema of Ilmenau, France 192 speakers
Daniel03
17B-Format
A-Format
microphone
FLD
W
Pre- Filtering
Matrix A ? B microphone dependent
Post- Filtering
FRU
X
Y
BLD
BRU
Z
18z
cosd
x
sind
?
d
cos?
y
sin?
listener position
i number of available loudspeakers
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22listening area
acoustic curtain
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31IA research projects
PCs and / or DSPs
Commercial products
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35core
core
core
GPP
interconnection
core
core
core
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39 you for your attention!
Thank