Patent US3810236A successfully refreshed from Google Patents.
US3810236A
Expired / Lapsed
US
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Data recording and verification system
Assignee: Unisys Corp
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Filing: 1972-09-21
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Granted: 1974-05-07
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Expires: 1992-09-21
Abstract
Abstract A digital data recording and verification system for use in moving magnetic medium recording systems such as tape or disc. The recording and verification system includes a magnetic head having a first winding used for writing (which may also be used for reading) information onto the medium and a second winding coupled thereto which may be used for erasing previously recorded information. As current, in response to input data, is driven through the first winding to produce flux changes in the head core, a voltage is induced in the second winding. This induced voltage is compared with the input data to verify, on a bit-bybit basis, that the recorded data matches the input data.
Inventors
- 👤 N Horowitz
- 👤 D Stupeck
- 👤 L Novak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:57
CPC Classifications
G; G06; G06F; G06F11/00; G06F11/07; G06F11/14; G06F11/1497
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
211 words
A system for simultaneously recording and verifying data comprising: a source of data pulses indicative of information to be recorded on a magnetic medium having at least one pulse for each bit of data to be recorded, a magnetic head having a flux path linking said magnetic medium, a write winding on said head coupled to said source of data pulses for creating writing flux changes in said magnetic head indicative of a data bit being written on said magnetic medium, detecting means for sensing said writing flux changes in said magnetic head at the same time said data is being written on said magnetic medium and providing induced voltage pulses simultaneously with said writing flux changes being detected, means for amplifying and shaping said induced voltage pulses and providing derived voltage pulses subsequent to said induced voltage pulses, delay means coupled to said source of data pulses for providing delayed data pulses, and comparison means adapted to receive said delayed data pulses and said derived voltage pulses for producing error signals when said writing flux changes in said magnetic head do not coincide in time and polarity with said induced voltage pulses whereby writing flux changes and verifying operations occur simultaneously, thereby eliminating the requirement for buffer and storage registers.
Claim 2
Independent Claim
211 words
A system for simultaneously recording and verifying data comprising: a source of data pulses indicative of information to be recorded on a magnetic medium having at least one pulse for each bit of data to be recorded, a magnetic head having a flux path linking said magnetic medium, a write winding on said head coupled to said source of data pulses for creating writing flux changes in said magnetic head indicative of a data bit being written on said magnetic medium, detecting means for sensing said writing flux changes in said magnetic head at the same time said data is being written on said magnetic medium and providing induced voltage pulses simultaneously with said writing flux changes being detected, means for amplifying and shaping said induced voltage pulses and providing derived voltage pulses subsequent to said induced voltage pulses, delay means coupled to said source of data pulses for providing delayed data pulses, and comparison means adapted to receive said delayed data pulses and said derived voltage pulses for producing error signals when said writing flux changes in said magnetic head do not coincide in time and polarity with said induced voltage pulses whereby writing flux changes and verifying operations occur simultaneously, thereby eliminating the requirement for buffer and storage registers.
Claim 3
Dependent Claim
20 words
The system As set forth in claim 1 wherein said detecting means comprises a second winding on said magnetic head.
Claim 4
Dependent Claim
19 words
The system as set forth in claim 2 wherein said second winding is supplied with an electrical current bias.
Claim 5
Dependent Claim
25 words
The system as set forth in claim 2 wherein said second winding has an end tap connected to a center tap of said write winding.
Claim 6
Dependent Claim
29 words
The system as set forth in claim 3 wherein said second winding is supplied with an electrical current bias sufficient to erase portions of data on said magnetic medium.
Claim 7
Dependent Claim
23 words
The systems as set forth in claim 1 wherein said magnetic medium is constantly moving at high speed during writing and detecting operations.
Claim 8
Independent Claim
193 words
A system for simultaneously recording and verifying data being recorded on a magnetic medium comprising: a megnetic medium, a source of data pulses indicative of information to be recorded on said magnetic medium having at least one pulse for each bit of data to be recorded, a first writing element connected to said source of data pulses for producing writing flux changes in said magnetic medium indicative of each data bit being written on said magnetic medium, detecting means for sensing said writing flux changes at the same time said data bits are being written on said magnetic medium and providing induced voltage pulses simultaneously with said writing flux changes being detected, means for amplifying and shaping said induced voltage pulses and providing derived voltage pulses subsequent to said induced voltage pulses, delay means coupled to said source of data pulses for providing delayed data pulses, and comparison means adapted to receive said delayed data pulses and said derived voltage pulses for producing error signals when said writing flux changes in said magnetic medium do not coincide in time and polarity with said induced voltage pulses whereby writing and verifying operations occur simultaneously.
Claim 9
Independent Claim
193 words
A system for simultaneously recording and verifying data being recorded on a magnetic medium comprising: a megnetic medium, a source of data pulses indicative of information to be recorded on said magnetic medium having at least one pulse for each bit of data to be recorded, a first writing element connected to said source of data pulses for producing writing flux changes in said magnetic medium indicative of each data bit being written on said magnetic medium, detecting means for sensing said writing flux changes at the same time said data bits are being written on said magnetic medium and providing induced voltage pulses simultaneously with said writing flux changes being detected, means for amplifying and shaping said induced voltage pulses and providing derived voltage pulses subsequent to said induced voltage pulses, delay means coupled to said source of data pulses for providing delayed data pulses, and comparison means adapted to receive said delayed data pulses and said derived voltage pulses for producing error signals when said writing flux changes in said magnetic medium do not coincide in time and polarity with said induced voltage pulses whereby writing and verifying operations occur simultaneously.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-06 | 1977-11-05 | 1978-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-06 | 1981-11-05 | 1982-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-06 | 1985-11-05 | 1986-05-07 | $7700.00 | Window Closed / Lapsed |