International Business Machines Corporation

Alain Dauby

Gerald Lebizay

Michel A Lechaczynski

Vladimir Riso

Michel Demange

Alain Audre Couder

Daniel Roger-Rodes

Jean-Claude Borie

A modular digital signal processor based on a master-slave architecture has the capability of expanding its processing power by aggregating additional modules in a tree type structure. In such a processor the control functions are subdivided into groups, each for performance in a distinct control unit. One or more of the control units can perform a master function with respect to one or several slaved control units and can itself be a slave to a higher level control unit. The arithmetic data functions of the processor are performed in pipe line multiplier-accumulator units (PMAU), each of which is controlled by, instructions from an associated control unit.

Modular signal processor having a hierarchical structure

High speed digital multiply-by-three device comprising a sum generation unit associated with a carry look-ahead unit, the latter comprising means for generating the carry bit C.sub.k.sub.+1 to be fed to the (k+1).sup.th stage of said sum generation unit by performing the logic function

High-speed digital multiply-by-device

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Nice, France

Alain Dauby