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I Room Acoustics (UNDER CONSTRUCTION)

I.1 Introduction to Room Acoustics
I.1.1 Basic concepts
Sound pressure, particle velocity, velocity potential, sound intensity

I.1.2 Reflection of sound
Impedance, absorption, transmission, diffraction, scattering, diffusion

I.1.3 Room acoustic responses
Can be obtained by measurements or by modeling. In this book, the focus is on modeling.

I.1.3.1 Impulse response
I.1.3.2 Time-energy response
I.1.4 Wave equation

c=343ms

Linearized wave-equation

∇2p−1c2∂2p∂t2=0

Helmholtz equation

Some non-linear terms are still important:

I.1.5 Air absorption
102030405060708090100−0.3−0.25−0.2−0.15−0.1−0.050
Attenuation of sound in air for different frequencies1kHz2kHz3kHz4kHz5kHz6kHz7kHz8kHz9kHz10kHzRelative humidity (%)dB / m

Function of humidity frequency both (3D surface)
Temperature: Winter Sauna 20 C
Pressure: Mount Everest Beach at Dead Sea 1013 mbar

I.2 Introduction to Room Acoustic Modeling
I.2.1 Source – Medium – Receiver model
I.2.1.1 Sound Sources
Directivity

I.2.1.2 Receivers
Human listener vs. microphones

I.2.2 Room acoustic attributes
I.2.3 Auralization
Table of Contents (up)II Wave-based modeling (UNDER CONSTRUCTION) (next)
© 2016 Lauri Savioja