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Field Counter Circuit

IP.com Disclosure Number: IPCOM000094920D
Original Publication Date: 1965-Jul-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Hoefs, GH: AUTHOR [+2]

Abstract

A standardized counter circuit can be used for each stage of a counter for different special symbols. This is realized by arranging for all common signal lines to be connected to a stage through a wiring card characteristic of the symbol to be recognized by that stage.

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Field Counter Circuit

A standardized counter circuit can be used for each stage of a counter for different special symbols. This is realized by arranging for all common signal lines to be connected to a stage through a wiring card characteristic of the symbol to be recognized by that stage.

In a reader-sorter for machine readable printed documents. a field counter is arranged to store the field delimiting special symbols when they are read and to generate control signals indicative of the current data field. There may be available. e.g., four species of special symbols SS1...SS4. Eight of these symbols, selected from the four species according to a predetermined format, determine seven data fields. The field counter is an open-ended ring of eight trigger stages. Each time before a document is read all triggers are reset. Each trigger is assigned to a specific one of the special symbols in that format. It is set on when this symbol is read. However, if the particular symbol is missing, the assigned trigger stage remains off without impeding higher stages to be set on when their assigned symbols are read.

Trigger 10 in A is set on by gate 18 only if all three inputs 29, 39 and 49 are conditioned. Inputs 29 and 39 are derived from variable wiring card 30. Four varieties of card 30 are shown at B1....B4 corresponding to four species of special symbols. A fifth variety at B5 is used in stages which are inoperative when the format does not require the full counter capacity. Any desired format is thus set up.

In drawing A. condition 29 holds that a special symbol of the assigned species is read. Lines 21...24 each carry a signal when the associated special symbol is read. Lin...