Chained Passband 
A way of combining 
passbands for modelling a set of cumulative passbands.  For example, placing one filter in front of another would be modelled as a 
ChainedPassband containing two 
FilterPassbands .
Might be used to model the various passrate effects during transmission from source to measurement (such as atmosphere, filter, detector).  
 Implementation 
Implements 
Passband.
Might be implemented as a linked list of passbands, or just a pair of  passbands, one of which could be another 
ChainedPassband. 
-- 
MartinHill - 21 May 2004