Magnetic character reader with double document detection
First Claim
1. Magnetic ink character recognition apparatus including a transport for moving documents bearing magnetic ink characters along a path successively past a character magnetizing station and a read station, said read station comprising a plurality of magnetic sensors arranged to encounter flux from different portions of characters borne by documents transported along said path, and wherein the improvement comprises:
- first circuit means for producing a reference signal as a function of the output of a small portion of said magnetic sensors,second circuit means for producing a cumulative signal that is porportional to the sum of the output of a large portion of said magnetic sensors when said sum is relatively small, andcomparison means responsive to a predetermined relationship between said reference and cumulative signals for indicating a multi-document error condition whenever said predetermined relationship exists.
1 Assignment
0 Petitions
Accused Products
Abstract
A multi-gap magnetic character reader is provided with the ability to automatically detect double documents. Where only weak signals are sensed, all signals are combined and compared to a reference. Where the weak signals are due to a piggyback document, the combined signals will be large with respect to the reference. Multiple documents thus detected are directed to a special reject bin.
49 Citations
10 Claims
-
1. Magnetic ink character recognition apparatus including a transport for moving documents bearing magnetic ink characters along a path successively past a character magnetizing station and a read station, said read station comprising a plurality of magnetic sensors arranged to encounter flux from different portions of characters borne by documents transported along said path, and wherein the improvement comprises:
-
first circuit means for producing a reference signal as a function of the output of a small portion of said magnetic sensors, second circuit means for producing a cumulative signal that is porportional to the sum of the output of a large portion of said magnetic sensors when said sum is relatively small, and comparison means responsive to a predetermined relationship between said reference and cumulative signals for indicating a multi-document error condition whenever said predetermined relationship exists. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. Magnetic ink character recognition apparatus including a transport for moving documents bearing magnetic ink characters along a path successively past a character magnetizing station and a read station, said read station comprising a plurality of magnetic sensors arranged to encounter flux from different portions of characters borne by documents transported along said path, and wherein the improvement comprises:
-
means for producing a reference signal as a function of the output of a small portion of said magnetic sensors, means for producing a cumulative signal as a function of the sum of the output of a large portion of said magnetic sensors non-linear signal modifying means operative on the signal produced by at least one of said signal producing means to distort the signal produced in a preselected range, and comparison means responsive to a predetermined relationship between said reference and cumulative signals for indicating a multi-document error condition whenever said predetermined relationship exists. - View Dependent Claims (8, 9, 10)
-
Specification