series to the low pass filter step 113 because this example is chiefly concerned with the design of a low pass filter the design of the high pass filter part of the splitter filter will not be described in more detail the element values for the first embryo of the splitter filter are optimised in a following step 114 on the basis of the set requirements subsequent to determining the element values it is ascertained whether or not the set requirements can be possibly achieved with a splitter filter having the structure in question step 115 if the requirements cannot be fulfilled the low pass filter is extended by cascade coupling a further filter section to the original or embryonic filter section step 116 as before mentioned this further filter section may be identical structure wise with the first filter section or may be structure wise different to said first filter section optimisation of the element values is then repeated step 114 if the set requirements can now be fulfilled the design of the splitter filter is ready on paper and the filter can now be implemented on the basis of the design created since the example is concerned chiefly with the design of a low pass filter it is the low pass filter and the requirements set thereon that are the focus in steps 114 115 and 116 separate measures may be needed to adapt the high pass filter part of the splitter filter although these measures are not described in this document the.