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n1 = 100 → TI1 = 60 db
n2 = 10 → TI2 = __?
TI2 = TI2 + 10 log (n2 / n1)
TI2 = 60 + 10 log (10 / 100)
TI2 = 60 + 10 log 0,1
TI2 = 60 - 10
TI2 = 50 dB ← jwb