An overview of Immersive Audio Sound Systems Dimitris Theodoropoulos Georgi Kuzmanov, Georgi Gaydadj

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An overview of Immersive Audio Sound
SystemsDimitris TheodoropoulosGeorgi Kuzmanov,
Georgi Gaydadjiev
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Presentation 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
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What 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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IA 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)
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IA 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)
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IA 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
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IA 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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loudspeaker
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dry sources
Room IRs
Wave field synthesizer
to loudspeakers
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(Institut de Recherche et Coordination
Acoustique/Musique - IRCAM)
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WFS
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
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f 0.6 KHz
f 1 KHz
Cinema of Ilmenau, France 192 speakers
Daniel03
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B-Format
A-Format
microphone
FLD
W
Pre- Filtering
Matrix A ? B microphone dependent
Post- Filtering
FRU
X
Y
BLD
BRU
Z
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z
cosd
x
sind
?
d
cos?
y
sin?
listener position
i number of available loudspeakers
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listening area
acoustic curtain
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IA research projects
PCs and / or DSPs
Commercial products
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core
core
core
GPP
interconnection
core
core
core
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you for your attention!
Thank