Multistage digital signal multiplying and adding apparatus.

摘要

Multistage digital signal multiplying and adding apparatus suitable for a multistage filter comprises a plurality of addition stages (l,2,N) each having adding devices (ll,l2,l3) for forming a succession of partial products together with selectors (34) operable in a first condition to connect sum and carry outputs of the adding devices within a stage to further adding devices within the stage or a second condition to supply outputs to a further stage, said selectors (34) being operable to change condition without resolving carry signals in one stage through all bit positions of that stage.