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A single-chip non-recursive digital processor is being made using a 5V ni-m.o.s. custom-l.s.i. approach. The processor will perform all the arithmetic required for a 48- tap non-recursive filter, with up to 30000 samples/s. The coefficient resolution is up to 10 bits. The processor uses a special coefficient coding to minimize the time required to perform the multiplications, and for this reason the maximum sampling rate depends on the coefficients and the coefficient resolution required. The design of the l.s.i. processor is given, and examples of filters which can be implemented using one l.s.i. processor, one 256Ã8 r.o.m. and two clock sources, are described.