Fecha de publicación: 25/01/1989 Fuente: Wipo "digitalization" The present invention relates to a digital-to-digital code converter (10), or decimator, which implements sinc processing. The input signal (X) to the code converter comprises a series of groups, each group including a series of N digital sample values occurring at high rate ( @) which are converted within the converter, using sinc processing, into a single digital value occurring at, for example, a 1/N tau rate for delivery to the converter output (Y). The code converter comprises three processing stages (11-13) in cascade, where each stage includes separate accumulation means (20-22), each accumulation means arranged to add, during each series of N input sample values, the signal value received by that stage from the next preceding stage. Each of the three stages further includes a separate subprocessing means (23-26) for processing the resultant accumulated digital value from the associated accumulation means at the end of each group period to produce a separate processed digital value which, when combined with the processed digital values from the other stages at the end of a group period, provides a single sinc processed digital value for the N input signal samples of each input group.3>3>3>