Browse Prior Art Database

Range Comparator

IP.com Disclosure Number: IPCOM000094722D
Original Publication Date: 1965-May-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Croad, JG: AUTHOR

Abstract

This system determines if a number falls within a range.

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Range Comparator

This system determines if a number falls within a range.

The determination of whether a number falls within a given range is made by comparing the number to be tested against both the higher and lower numbers of the range. If equality does not exist, the lower number of the range is increased by one. The comparison between the incremented number and the number to be tested is repeated. This operation is repeated until the lower number equals the test number which indicates that the number falls within the range. Or, the operation is repeated until the incremented lower range number equals the upper range number without the number to be tested equaling the lower range number which indicates that the number to be tested falls outside the range.

If equality is established at D before starting the stepping, or before C and B establish equality at E, the number falls within the range and is indicated by the equal output of D. If the number at A is higher than the high limit, C is stepped upward to equal 13 before C equals A. The equal output of E switches trigger T from not-equal output to equal output indicating that the number is outside the range. Absence of not-equal output disables the And which gates the stepping pulses to C. If the number at A is lower than the low limit, C starts higher than A and counts to B to produce an E equal output that results in trigger operation indicating that the number is outside the limits. The maximum number of s...