GB1215250A - Circuit arrangement for calculating a test digit - Google Patents

Circuit arrangement for calculating a test digit

Info

Publication number
GB1215250A
GB1215250A GB6101968A GB6101968A GB1215250A GB 1215250 A GB1215250 A GB 1215250A GB 6101968 A GB6101968 A GB 6101968A GB 6101968 A GB6101968 A GB 6101968A GB 1215250 A GB1215250 A GB 1215250A
Authority
GB
United Kingdom
Prior art keywords
counter
fed
digit
mod
dec
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB6101968A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Philips Electronics UK Ltd
Original Assignee
Philips Electronic and Associated Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE19671524994 external-priority patent/DE1524994A1/en
Application filed by Philips Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB1215250A publication Critical patent/GB1215250A/en
Expired legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00Error detection; Error correction; Monitoring
    • G06F11/07Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/08Error detection or correction by redundancy in data representation, e.g. by using checking codes
    • G06F11/10Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's
    • G06F11/1008Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's in individual solid state devices
    • G06F11/1012Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's in individual solid state devices using codes or arrangements adapted for a specific type of error
    • G06F11/104Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's in individual solid state devices using codes or arrangements adapted for a specific type of error using arithmetic codes, i.e. codes which are preserved during operation, e.g. modulo 9 or 11 check

Abstract

1,215,250. Check digits. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. 23 Dec., 1968 [23 Dec., 1967], No. 61019/68. Heading G4A. A check digit P is calculated from the formula wherein the weighting Gi of each digit Zi increases according to its decimal order. A test on the number brings a counter operating modulo M to zero, for correct operation. Successive digits each increased by M starting with the highest are fed at 3 to counter 1 and via switch 7 to counter 2. A carry pulse from 1 operates bi-stable 5 to open AND gate 6 so that as Z 1 is fed into counter 1 twice that number is fed into counter 2 due to both the leading and trailing edges of pulses 3 affecting OR gate 8. After m cycles counter 1 registers (Z 1 + Z 2 + . . . + Zm) mod M, and counter 2 ((m + 1)Z 1 + mZ 2 + . . . 2Zm) mod M. The latter is equal to M-P, so giving the check digit P. After recording or transmission the number is checked by repeating the process on the complete number with the switch 7 open. Counting in counter 2 begins now only when carry from counter 1 takes place but the registration modulo M is the same, and with the addition of P comes to zero if transmission has been correct.
GB6101968A 1967-12-23 1968-12-23 Circuit arrangement for calculating a test digit Expired GB1215250A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19671524994 DE1524994A1 (en) 1967-12-23 1967-12-23 Circuit arrangement for calculating a check digit

Publications (1)

Publication Number Publication Date
GB1215250A true GB1215250A (en) 1970-12-09

Family

ID=5675097

Family Applications (1)

Application Number Title Priority Date Filing Date
GB6101968A Expired GB1215250A (en) 1967-12-23 1968-12-23 Circuit arrangement for calculating a test digit

Country Status (3)

Country Link
CH (1) CH501970A (en)
FR (1) FR1596368A (en)
GB (1) GB1215250A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2384354A (en) * 2002-01-18 2003-07-23 Yeoman Group Plc Navigation System
US6950745B2 (en) 2000-05-16 2005-09-27 Yeoman Group Plc Navigation system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6950745B2 (en) 2000-05-16 2005-09-27 Yeoman Group Plc Navigation system
US7742873B2 (en) 2000-05-16 2010-06-22 Yeoman Group Plc Navigation system
GB2384354A (en) * 2002-01-18 2003-07-23 Yeoman Group Plc Navigation System

Also Published As

Publication number Publication date
FR1596368A (en) 1970-06-15
CH501970A (en) 1971-01-15

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