Some novel elements for delta-modulated signal processing

New and interesting multipliers are proposed to use for the direct-multiplication of delta-modulated signals by constants. In addition to a non-recursive form, three recursive-form delta multipliers are given. The recursive multipliers are suitable for multiplication by periodic numbers or by non-periodic numbers which can be approached by periodic ones. A significantly smaller number of delta adders is needed for the realization of recursive delta multipliers, than for the non-recursive ones. In addition, an interconnecting method is suggested, if the outputs of the multipliers are to be added. With the method a significant reduction of the scaling-down is achieved as well as a reduction of the total number of the necessary adders for the realization of the multipliers. The combination of interconnecting multipliers and delta doubters gives very good results for the realization of digital filters.