U.S. Philips Corporation

Johannes Schuck

Karl Hellwig

Harald Bauer

Alfred Baier

Dietmar Lorenz

Dirk Weinsziehr

In processors, notably digital signal processors, it is often necessary to form the sum of products of a concatenation of data word pairs, for example for correlation or convolution operations, in which the one data word of each pair can assume only one of the two values +1 or -1. In accordance with the invention, in that case instead of forming a product in a multiplier, the one data word of each pair is applied to an add/subtract device in order to control the function thereof in respect of addition or subtraction; one input of the add/subtract unit then receives the other data words of the data word pairs, and the other input is connected to the output of the accumulator register. Thus, a complex multiplier device is saved or, should such a device be present anyway, it will not be used so that the power loss of the processor is reduced.

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Munich, Georgia

Johannes Schuck