Ratio comparator for digital signals

Details Ratio comparator for digital signals Ratio comparator for digital signals

1984-12-21

1986-04-22

Malzahn, David H.

Communications: electrical

Digital comparator systems

G06F 702

Patent

active

045845565

ABSTRACT:
In a system for comparing the ratio of two numbers to a threshold, the bits of each number are compared in groups comprising less than the total number of bits. The most significant group of bits are first compared, and if they contain sufficient information to make the comparison, the result thereof is indicated. If the most significant group of bits does not contain sufficient information, the comparison is made based upon the next higher order group of bits that does contain sufficient information. In some situations, it is desirable to obtain information about the next lower order group of bits in order to verify whether a determination is correct. Each of these situations has a unique address in a memory unit dedicated to the next lower order group of bits. In response to an input signal indicating that a determination subject to verification has been made, this memory unit provides an output signal that indicates the validity of the determination, based upon input information to this memory unit that is not contained in the higher order group of bits.

REFERENCES:
patent: 3852581 (1974-12-01), Reynard
patent: 4374427 (1983-02-01), Katayama
Hemel, "Making Small ROM's Do Math Quickly, Cheaply and Easily", Electronics, May 11, 1970, pp. 104-111.
Stefanelli, "Binary Read-Only-Memory Dividers", Alta Frequenza (Italy) vol. 48, No. 11, Nov. 1979, pp. 690-693.

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