 |
|
|
|
|
|
 Title: |
US4058706:
MICR data lift system
[ Derwent Title ]
|
| Country: |
US United States of America
|
| |
| 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)
News, Profiles, Stocks and More about this company
|
| Published / Filed: |
1977-11-15
/ 1976-04-23
|
| Application Number: |
US1976000679676
|
| IPC Code: |
Advanced:
G06K 9/00;
Core:
more...
IPC-7:
G06K 7/08;
G06K 7/14;
G06K 9/18;
G11B 5/10;
|
| ECLA Code: |
G06K9/00E;
|
| 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.
|
| Background / Summary: |
Show background / summary
|
| Drawing Descriptions: |
Show drawing descriptions
|
| Description: |
Show description
|
| Forward References: |
Show 4 U.S. patent(s) that reference this one
|
