Resonant Frequencies in Rooms
Rayleigh’s formula for the frequencies of modes in a rectangular room:
where nL, nW and nH are positive integers, including 0, L, W and H are the room dimensions and c is the velocity of sound.
Modal density. If the number of resonant modes N below the frequency f is fairly high then a reasonable approximation is given by
|where||V is the volume,|
|S is the total surface area, 2(LW + WH + HL) and|
|L is the sum of the edge lengths 4(L + W + H).|
Reverberation time (RT, r.t. or T60)
This is defined as the ...