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Title: US4058706: MICR data lift system
[ Derwent Title ]

Country: US United States of America

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18 pages

Inventor: Kao, Charles T.; Garland, TX
Lafevers, James O.; Richardson, TX
Walker, Donny R.; Carrollton, TX

Assignee: Recognition Equipment Incorporated, Dallas, TX
other patents from RECOGNITION EQUIPMENT INCORPORATED (467235) (approx. 145)
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Published / Filed: 1977-11-15 / 1976-04-23

Application Number: US1976000679676

IPC Code: Advanced: G06K 9/00;
IPC-7: G06K 7/08; G06K 7/14; G06K 9/18; G11B 5/10;

ECLA Code: G06K9/18M;

U.S. Class: Current: 235/449; 235/474; 360/129; 382/320;
Original: 235/449; 235/474; 340/146.3C; 360/129;

Field of Search: 235/61.11 D,61.11 F,61.7 R,61.11 R,61.9 R,61.7 A 340/146.3 C,146.3 AG,146.3 Z 360/121,129

Priority Number:
1976-04-23  US1976000679676

Abstract:     A magnetic ink character reading system is provided in which multi-element read heads are positioned in a spaced apart and staggered arrangement. Data signals occurring in the analog responses of the read heads are detected, and converted to discrete logic level signals under the control of a dynamically adjustable threshold. The logic level signals of each read head are sampled in response to independent data sample signals which are phase locked to the data rate of the respective read head. NRZ (non-return-to-zero) data signals formed thereby are synchronized to a common fixed frequency, and serialized faithfully to represent the characters appearing on documents passing the read heads.

Attorney, Agent or Firm: Vandigriff, John E. ; DeMond, Thomas W. ;

Primary / Asst. Examiners: Kilgore, Robert M.;

INPADOC Legal Status: Show legal status actions

Family: None

First Claim:
Show all 14 claims
What is claimed is:     1. A method of formatting conditioned responses of a pair of asynchronously operating multi-element read heads to accommodate a synchronization to a common fixed frequency, which comprises:
  • a. selecting at a scan rate a first maximum response of a first of said pair and a second maximum response of a second of said pair;
  • b. generating a first data peak signal at said scan rate if said first maximum response exceeds a reference width, and a second data peak signal if said second maximum response exceeds said reference width;
  • c. normalizing said first and said second maximum response, and respectively forming therefrom a first and a second reference threshold;
  • d. normalizing said conditioned responses of said pair;
  • e. converting normalized responses of said first of said pair to a first discrete logic level signal under the control of said first reference threshold, and converting normalized responses of said second of said pair to a second discrete logic level signal under the control of said second reference threshold;
  • f. sampling said first and said second discrete logic level signals to form a first and a second NRZ data signal, respectively, in response to said first and said second data peak signals; and
  • g. synchronizing said first and said second NRZ data signals with said common fixed frequency.

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Forward References: Show 6 U.S. patent(s) that reference this one

U.S. References: Go to Result Set: All U.S. references   |  Forward references (6)   |   Backward references (10)   |   Citation Link

Patent  Pub.Date  Inventor Assignee   Title
Get PDF - 7pp US3104372* 1963-09 Rabinow    
Get PDF - 4pp US3195119  1965-07 Worosz   Magnetic transducer head assembly
Get PDF - 16pp US3578953  1971-05 Milford  Honeywell Information Systems Inc. SYSTEM FOR READING INTERMIXED MARKS AND SYMBOLS FROM DOCUMENTS
Get PDF - 11pp US3710319  1973-01 Miller  Scanamation Corporation OPTICAL CHARACTER RECOGNITION SYSTEM
Get PDF - 6pp US3806902  1974-04 Drees  Nortronics Company, Inc. MAGNETIC HEAD READ-TO-WRITE GAP CROSSFEED SHIELDING
Get PDF - 18pp US3811033  1974-05 Herrin  Monarch Marking Systems, Inc. CODED RECORD INTERPRETING SYSTEM
Get PDF - 26pp US3886521  1975-05 Dobras  Monarch Marking Systems, Incorporated Coded record and methods of and apparatus for encoding and decoding records
Get PDF - 6pp US3895350  1975-07 De Vries  U.S. Philips Corporation Method of and device for recognition of characters
Get PDF - 15pp US3949363  1976-04 Holm  Recognition Equipment, Incorporated Bar-Code/MICR/OCR merge
Get PDF - 6pp US3978450  1976-08 Sanner  Recognition Equipment Incorporated Image character reader system
  * some details unavailable
Foreign References: None

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