Accurate high speed digital signal processor

Details Accurate high speed digital signal processor Accurate high speed digital signal processor

1996-06-04

2000-10-03

Follansbee, John A.

Electrical computers and digital processing systems: processing

Processing control

Arithmetic operation instruction processing

712 24, 712210, 712212, 712220, 708204, 708505, 708632, G06F 1500

Patent

active

061287261

ABSTRACT:
An improved digital signal processor, in which arithmetic multiply-add instructions are performed faster with substantial accuracy. The digital signal processor performs multiply-add instructions with look-ahead rounding, so that rounding after repeated arithmetic operations proceeds much more rapidly. The digital signal processor is also augmented with additional instruction formats which are particularly useful for digital signal processing. A first additional instruction format allows the digital signal processor to incorporate a small constant immediately into an instruction, such as to add a small constant value to a register value, or to multiply a register by a small constant value; this allows the digital signal processor to conduct the arithmetic operation with only one memory lookup instead of two. A second additional instruction format allows the digital signal processor to loop back to a location relatively addressed from the looping instructions; this allows the digital signal processor to conduct the loop operation with only one memory lookup instead of two.

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