Kierunek „Elektronika”, rok II

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Kierunek „Elektronika”, rok II

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Kierunek „Elektronika”, rok II Electroacoustics Kierunek „Elektronika”, rok II

Acoustic field in rooms

Frequency ranges L c 2 V Tp f 2000 = 4 Lumped parameters Frequency Wave theory Statistical theory Geometrical L c 2 V Tp f k 2000 = 4

Rise and decline of sound in a room Steady state Reverberation

Reverberation Time RT60

Formulas for RT60 (according to statistical theory) Formula of Sabine Formula of Eyring Formula of Knudsen (with absorption in the air)

Absorbtion according to Eyring i Sabine Ey(a) – effective absorption coefficient according to Eyring

Recommended reverberation time

Sound absorbing materials

Absorption coefficients of porous materials

Absorption coefficient of Helmholtz resonator

Room resonances according to wave theory (Room No. 607 C-5)

Geometrical theory

Design of large halls

Echogram