US4293930A
Expired / Lapsed
US
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Bubble detection system
Assignee: Unisys Corp
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Filing: 1979-10-24
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Granted: 1981-10-06
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Expires: 1999-10-24
Abstract
Abstract There is disclosed a double detection arrangement for minimizing soft errors emanating from a bubble memory. Soft errors are errors due to sporadic, periodic, and random noise which gives an erroneous indication of a bubble's presence. The arrangement provides double detection by sampling a bubble signal's wave shape on its positive and negative transition within a certain time frame. When a positive and negative transition are detected within a specified time frame, the presence of a bubble is considered to be present. Conversely, when only a single positive or only a single negative transition is detected within the time frame, the absence of a bubble or noise is assumed.
Inventors
- 👤 Joseph Van Reymersdal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:50
CPC Classifications
G; G11; G11C; G11C19/00; G11C19/02; G11C19/08; G11C19/0866
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
75 words
Apparatus for determining presence or absence of a magnetic bubble comprising: (a) means for twice strobing a signal produced by said magnetic bubble; (b) means coupled to said sensing means for twice detecting (said) signals produced by said dual strobing within a specified time period, whereby the detection of said bubble signal twice indicates the presence of a bubble, and the failure to detect a bubble signal twice indicates the absence of a bubble signal.
Claim 2
Dependent Claim
75 words
Apparatus for determining presence or absence of a magnetic bubble comprising: (a) means for twice strobing a signal produced by said magnetic bubble; (b) means coupled to said sensing means for twice detecting (said) signals produced by said dual strobing within a specified time period, whereby the detection of said bubble signal twice indicates the presence of a bubble, and the failure to detect a bubble signal twice indicates the absence of a bubble signal.
Claim 3
Dependent Claim
29 words
Apparatus in accordance with claim 1 wherein a. said means for twice detecting said signal within a specified time period comprises a register with a capacity of two bits.
Claim 4
Dependent Claim
25 words
Apparatus in accordance with claim 2 wherein a. said means for twice detecting said signal within a specified time period comprises a two-bit shift register.
Claim 5
Dependent Claim
32 words
Apparatus in accordance with claim 3 wherein a. said means for twice detecting said signal within a specified time period comprises means for detecting said signal during its leading and trailing edges.
Claim 6
Independent Claim
74 words
A method for determining the presence of a magnetic bubble, comprising the steps of: (a) strobing for the presence of a bubble memory signal twice within a specified time period, whereby if said magnetic bubble is detected twice by said strobing, the presence of a bubble is assumed; and if (b) said bubble signal is detected less than twice within a specified time period, a spurious signal or absence of a bubble is assumed.
Claim 7
Independent Claim
74 words
A method for determining the presence of a magnetic bubble, comprising the steps of: (a) strobing for the presence of a bubble memory signal twice within a specified time period, whereby if said magnetic bubble is detected twice by said strobing, the presence of a bubble is assumed; and if (b) said bubble signal is detected less than twice within a specified time period, a spurious signal or absence of a bubble is assumed.
Claim 8
Independent Claim
77 words
A method for determining the presence of a bubble memory signal with minimum error comprising the steps of: (a) strobing said bubble memory signal twice within a specified time period; (b) accepting a double signal produced by said dual strobing as the presence of a magnetic bubble when said signal is detected twice; (c) rejecting said signal as being spurious when said signal is detected less than twice, whereby interpreting noise signals as magnetic bubble is minimized.
Claim 9
Independent Claim
77 words
A method for determining the presence of a bubble memory signal with minimum error comprising the steps of: (a) strobing said bubble memory signal twice within a specified time period; (b) accepting a double signal produced by said dual strobing as the presence of a magnetic bubble when said signal is detected twice; (c) rejecting said signal as being spurious when said signal is detected less than twice, whereby interpreting noise signals as magnetic bubble is minimized.
References Cited (Backward Citations)
US3953840A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-05 | 1985-04-06 | 1985-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-05 | 1989-04-06 | 1989-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-05 | 1993-04-06 | 1993-10-06 | $7700.00 | Window Closed / Lapsed |