ACL Channel Maths - Filter Function

Hi,
For the ACL's (and assume the ADL's), what type of filter is used in the channels maths, i.e. by time or by samples.
And what units is the Filter constant in... ms? samples?
Thanks, J.
For the ACL's (and assume the ADL's), what type of filter is used in the channels maths, i.e. by time or by samples.
And what units is the Filter constant in... ms? samples?
Thanks, J.