GB1010001A - Improvements in or relating to character recognition systems - Google Patents
Improvements in or relating to character recognition systemsInfo
- Publication number
- GB1010001A GB1010001A GB23250/63A GB2325063A GB1010001A GB 1010001 A GB1010001 A GB 1010001A GB 23250/63 A GB23250/63 A GB 23250/63A GB 2325063 A GB2325063 A GB 2325063A GB 1010001 A GB1010001 A GB 1010001A
- Authority
- GB
- United Kingdom
- Prior art keywords
- diode
- highest
- comparator
- signal
- character
- 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
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F7/00—Methods or arrangements for processing data by operating upon the order or content of the data handled
- G06F7/02—Comparing digital values
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0038—Circuits for comparing several input signals and for indicating the result of this comparison, e.g. equal, different, greater, smaller (comparing pulses or pulse trains according to amplitude)
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Computational Mathematics (AREA)
- Mathematical Analysis (AREA)
- Mathematical Optimization (AREA)
- Pure & Applied Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Character Input (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
1,010,001. Automatic character reading. COMPAGNIE DES MACHINES BULL. June 11, 1963 [June 19, 1962], No. 23250/63. Addition to 951014. Heading G4R. In a character recognition system as described in the parent Specification a comparator unit for determining the highest integration signal obtained during a scanning sub-cycle consists in an amplifier A10, Fig. 1, and a feed-back loop consisting of a Zener diode DZ. The action of the amplifier and diode is to keep the potential of the input constant by balancing the currents from terminals B11 and B12 with a feed-back current. The applied voltages e1 and e2 are of opposite values and the potential across the diode DZ is zero or its critical voltage depending upon the direction of current flow in the diode. The two state output therefore indicates that e1 or e2 is the larger. A series of eight such circuits 401-408, Fig. 2 receive respectively the four true voltages Sh, Sv, Sd1 and Sd2 from the four integrators and their inverses-Sh etc. A reference voltage SM is applied to each comparator derived by applying the above four signals and their inversers to a diode OR gate 100 to obtain the highest signal. Resistors 1R and 9R give 90% of this highest value which is used as the reference input. The highest signal gives a corresponding output on one of the terminals 421-428. Other outputs may be produced from signals exceeding 90% of the highest, such a multiple output being used to reject the character as described in the parent case. For each comparator stage a further similar comparator may be provided receiving the same signal 8, h etc. and a fixed reference signal. This comparator produces an output indicating that the contrast between two predetermined portions elemental area scanned is higher than a given value, i.e. that the elemental area does in fact include the edge of a character stroke. A gate receives the outputs from both comparators and passes a signal only if both are present.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR901160A FR82108E (en) | 1962-06-19 | 1962-06-19 | Improvements to character recognition systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1010001A true GB1010001A (en) | 1965-11-17 |
Family
ID=8781313
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB23250/63A Expired GB1010001A (en) | 1962-06-19 | 1963-06-11 | Improvements in or relating to character recognition systems |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US3284716A (en) |
| BE (1) | BE632480A (en) |
| FR (1) | FR82108E (en) |
| GB (1) | GB1010001A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3521082A (en) * | 1967-08-15 | 1970-07-21 | Honeywell Inc | Linear/log time ramp generator |
| US3740652A (en) * | 1971-11-17 | 1973-06-19 | Monsanto Co | Signal selector circuit |
| DE2207315A1 (en) * | 1972-02-17 | 1973-08-23 | Bodenseewerk Perkin Elmer Co | PEAK DETECTOR |
| US4523107A (en) * | 1982-04-23 | 1985-06-11 | Motorola, Inc. | Switched capacitor comparator |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB580527A (en) * | 1942-06-05 | 1946-09-11 | Alan Dower Blumlein | Improvements in or relating to electrical circuit arrangements for effecting integration and applications thereof |
| US2632845A (en) * | 1950-12-22 | 1953-03-24 | Rca Corp | Coincidence indicator |
| US3094675A (en) * | 1956-05-21 | 1963-06-18 | Gilfillan Bros Inc | Degenerative feedback amplifier utilizing zener diode |
| US3076901A (en) * | 1960-01-11 | 1963-02-05 | Electric Associates Inc | Circuit for separately indicating voltage magnitude and polarity of analog input signal |
-
0
- BE BE632480D patent/BE632480A/xx unknown
-
1962
- 1962-06-19 FR FR901160A patent/FR82108E/en not_active Expired
-
1963
- 1963-06-10 US US286789A patent/US3284716A/en not_active Expired - Lifetime
- 1963-06-11 GB GB23250/63A patent/GB1010001A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR82108E (en) | 1963-12-27 |
| US3284716A (en) | 1966-11-08 |
| BE632480A (en) |
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