6
Background noise
nIf the background noise is superposed to the impulse response, the previous method already takes care of it,
and the MTF values are measured
correctly
nHowever, in some cases, it is advisable to perform a
noise-free measurement of the IR, and then
insert the effect of the noise with
the following expression:
nThis makes it possible to measure the impulse
response in the laboratory, and
then to perform just the noise measurement
with the car running over the road