US4356472A
Expired / Lapsed
US
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Character recognition system
Assignee: International Business Machines Corp
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Filing: 1980-06-27
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Granted: 1982-10-26
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Expires: 2000-06-27
Abstract
Abstract A character recognition system including a timing subsystem, comprising a base oscillator or clock, and timing circuits driven by the base clock to provide a plurality of timing pulses for timing the operation of the entire system. The timing circuits are governed in part by delay circuits which are in turn controlled by the amplitude and location of peak signals derived from scanning earlier pulses.
Inventors
- 👤 Edward Hau-Chun Ku
- 👤 Gene D. Rohrer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:29
CPC Classifications
G; G06; G06V; G06V30/00; G06V30/10; G06V30/22; G06V30/224; G06V30/2253
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
161 words
A character recognition system comprising, in combination, scanning means for scanning characters to be read, said scanning means providing output signals distinctive for each character, said signals having at least one peak signal having an amplitude and time of occurrence characteristic of the character, peak determining means for determining the magnitude of said peak signal, timing means including a base oscillator and means for deriving a plurality of timing signals from the output of said oscillator, and delay means connected to said timing means for delaying said timing signals by predetermined amounts, said delay means being governed by said peak determining means and including a delay control trigger connected to said peak determining means, and to a plurality of delay timing circuits for governing the generation of said delayed timing signals, inhibiting means for inhibiting said delay control trigger when the scanning output signals indicate the scanning of predetermined characters, and circuit means for supplying the delayed signals to said system.
Claim 2
Dependent Claim
161 words
A character recognition system comprising, in combination, scanning means for scanning characters to be read, said scanning means providing output signals distinctive for each character, said signals having at least one peak signal having an amplitude and time of occurrence characteristic of the character, peak determining means for determining the magnitude of said peak signal, timing means including a base oscillator and means for deriving a plurality of timing signals from the output of said oscillator, and delay means connected to said timing means for delaying said timing signals by predetermined amounts, said delay means being governed by said peak determining means and including a delay control trigger connected to said peak determining means, and to a plurality of delay timing circuits for governing the generation of said delayed timing signals, inhibiting means for inhibiting said delay control trigger when the scanning output signals indicate the scanning of predetermined characters, and circuit means for supplying the delayed signals to said system.
Claim 3
Dependent Claim
78 words
A character recognition system as claimed in claim 1 further including a plurality of integrator circuits for integrating said output signals over each of a corresponding plurality of time zones, reset means for resetting said integrators, reset control means for varying the resetting time of said integrators, said reset control means being governed by said delay control trigger to effectively delay said reset time only when said delay control trigger is ineffective to govern said delay timing circuits.
Claim 4
Dependent Claim
21 words
A character recognition system as claimed in claim 2, in which said reset control means additionally governs said delay timing circuits.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-10-25 | 1986-04-26 | 1986-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-25 | 1990-04-26 | 1990-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-25 | 1994-04-26 | 1994-10-26 | $7700.00 | Window Closed / Lapsed |