safouette.py

Created by mathoulde1406

Created on May 13, 2025

897 Bytes


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NIV EQUIVALENT
- Leq,T = 10 log (1/T(t1x10 l1/10+t2x10 l2/10+...))
EX 2 =
Correlé si mm signal
NIV INTENSITE
- SPLtot = 10log(10 l1/10 + 10 l2/10 +...)
- SPL - Lw + 10log(Q) - 1l - 20log (R)
NIV PUISSANCE
- Lw = SPL - 10log(Q) + 1l + 20log (R)
Lw en dB
Q=1 si omni
NIV INTENSITE ACOUSTIQUE
- SPL (=LI) = 10 log (I/I0)
I0=10'-12 w.m-2
NIV PRESSION ACOUSTIQUE
- SPL (=lp) = 20log (p/p0)
p = p0 x 10'SPL/20
p0=2x10'-5 pa
NIV PUISSANCE ACOUSTIQUE
- Lw = 10log (w/w0)
w0=1x10'-12 w
EX 3
TEMPS REVERBERATION
- SABINE TR = 0,16 x V / A
- EYRING TR = -0,16 x V / E(Si x Ln(1-alpha i))
BASES :
- V= lxLxh (en M3)
- S = 2(lxL+lxh+Lxh) (en M2)
EX 4
FREQUENCE PROPRES
- Flmn = c/2 .... (a voir)
NIV DE PRESSION REVERBERE / CHAMPS
- Lpr(en dB)= Lw + 6 - 10log A

NIV DE PUISSANCE
- Lw = Lpr - 6 + 10logA
NIV DE PRESSION DIRECT
- Lp direct = Lw + 10log(Q) - 1l - 20log(R)

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