US3646531A
Expired / Lapsed
US
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Magnetic core signal discrimination method
Assignee: CORE MEMORIES Inc
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Filing: 1969-10-10
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Granted: 1972-02-29
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Expires: 1989-10-10
Abstract
Abstract A ferrite core signal discriminating system is disclosed which uses a variable threshold for more accurate signal discrimination. A threshold control amplifier provides a time dependent threshold level to a discriminator with a high static level during initial read drive current periods and an exponentially decreasing level following the peak of noise and before peaks of ensuing core switching periods to improve discrimination of signal from noise.
Inventors
- 👤 Seishin Marahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:04
CPC Classifications
G; G11; G11C; G11C11/00; G11C11/02; G11C11/06; G11C11/06007
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
A method of improving accurate discrimination of a ferrite core signal by providing a time-dependent discriminating threshold voltage at a high level throughout initial periods during which read drive current, transmitted in at least one winding passing through said core, induces noise signals in a second winding passing through said core, and decreasing said threshold level during ensuring core turnover periods to time dependent levels substantially between the envelope of a minimum turnover signal to be expected aNd the envelope of maximum noise signal to be expected from a time when the noise signal has passed its peak amplitude to a time when the turnover signal has passed its peak amplitude and has reached a level substantially below the peak of a minimum amplitude noise signal to be expected.
Claim 2
Independent Claim
129 words
A method of improving accurate discrimination of a ferrite core signal by providing a time-dependent discriminating threshold voltage at a high level throughout initial periods during which read drive current, transmitted in at least one winding passing through said core, induces noise signals in a second winding passing through said core, and decreasing said threshold level during ensuring core turnover periods to time dependent levels substantially between the envelope of a minimum turnover signal to be expected aNd the envelope of maximum noise signal to be expected from a time when the noise signal has passed its peak amplitude to a time when the turnover signal has passed its peak amplitude and has reached a level substantially below the peak of a minimum amplitude noise signal to be expected.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |