Recursive numerical processor

Details Recursive numerical processor Recursive numerical processor

1974-12-23

1976-09-21

Ruggiero, Joseph F.

Registers

Transfer mechanism

Traveling pawl

235152, 235164, G06F 738

Patent

active

039821129

ABSTRACT:
The invention relates to a recursive numerical processor for data in word serial form in which bias errors are reduced by use of a property of two's complement notation. The input data is introduced in two's complement notation. The processor includes a sub-processor, typically a multiplier, introducing a bias error on the order of the least significant bit. The bias error arises from truncation or rounding necessary to avoid word growth in the processor. In accordance with the invention, the sub-processor is provided with a sign inverter at its input and at its output and the two sign inverters perform a double sign inversion on alternate words. Alternate word sign switching causes the error to alternate between being too large and too small (in magnitude), a property of two's complement notation, thus cancelling a very substantial part of the bias error. The invention has application to a number of recursive numerical processors including recursive digital filters.

REFERENCES:
patent: 3609568 (1971-09-01), Jackson
patent: 3699326 (1972-10-01), Kindell et al.
patent: 3725687 (1973-04-01), Heightley

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