Patent US4020460A successfully refreshed from Google Patents.
US4020460A
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Method and apparatus of checking to determine if a signal is present on more than one of n lines
Assignee: International Business Machines Corp
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Filing: 1975-11-13
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Granted: 1977-04-26
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Expires: 1995-11-13
Abstract
Abstract This specification describes an apparatus for determining if more than one of n lines are up at a given time. The apparatus includes means for encoding the n lines into m lines where n = 2 m . Two encoding signals are generated; one, X 0 X 1 . . . X m , complement of the other, Z 0 Z 1 . . . Z m . These two signals are Ex OR'd in accordance with the formula (X 0 Z 0 ) .sup.. (X 1 Z 1 ) . . . (X m Z m ). If more than one line is up, the resultant of the Ex OR operation is one. Otherwise the resultant is zero.
Inventors
- 👤 Julius Dwight Jones
- 👤 Dale Milton Junod
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:55
CPC Classifications
H; H03; H03M; H03M13/00; H03M13/47; H03M13/51; G; G06; G06F; G06F11/00; G06F11/07; G06F11/08; G06F11/085
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
112 words
A method for determining whether more than one of n lines are up comprising the steps of: encoding the n lines into m digits where n = 2 m in two complementary sets, X 0 , X 1 , . . . X m and Z 0 , Z 1 , . . . Z m , comparing the two sets together in accordance with the following formula: (X 0 Z 0 ) .sup.. (X 1 Z 1 ) . . . .sup.. (X m Z m ); and, determining if the resultant of comparison is a binary one or a binary zero to indicate whether more than one line is up.
Claim 2
Independent Claim
112 words
A method for determining whether more than one of n lines are up comprising the steps of: encoding the n lines into m digits where n = 2 m in two complementary sets, X 0 , X 1 , . . . X m and Z 0 , Z 1 , . . . Z m , comparing the two sets together in accordance with the following formula: (X 0 Z 0 ) .sup.. (X 1 Z 1 ) . . . .sup.. (X m Z m ); and, determining if the resultant of comparison is a binary one or a binary zero to indicate whether more than one line is up.
Claim 3
Dependent Claim
28 words
The method of claim 1 comparing the low order digits X 0 and Z 0 to see if they are different to determine if no lines are up.
Claim 4
Dependent Claim
121 words
Apparatus for determining whether a signal is present on more than one of n lines comprising: encoding means coupled to the n lines for generating two orthogonal decoding signals of m digits, X 0 , X 1 , . . . X m and Z 0 , Z 1 . . . Z m where n = 2 m ; comparison means coupled to the output of the encoding means for performing the following comparison: (X 0 Z 0 ) .sup.. (X 1 Z 1 ) . . . (X m Z m ); and, means coupled to the output of the comparison means for indicating whether the output of the comparison circuit is a binary one or a binary zero.
Claim 5
Dependent Claim
121 words
Apparatus for determining whether a signal is present on more than one of n lines comprising: encoding means coupled to the n lines for generating two orthogonal decoding signals of m digits, X 0 , X 1 , . . . X m and Z 0 , Z 1 . . . Z m where n = 2 m ; comparison means coupled to the output of the encoding means for performing the following comparison: (X 0 Z 0 ) .sup.. (X 1 Z 1 ) . . . (X m Z m ); and, means coupled to the output of the comparison means for indicating whether the output of the comparison circuit is a binary one or a binary zero.
Claim 6
Dependent Claim
41 words
The apparatus of claim 3 including: means coupled to the output of the comparison means for determining whether the low order digits X 0 and Z 0 are the same or different to find if none of the lines are up.
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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) | 1980-04-25 | 1980-10-25 | 1981-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-25 | 1984-10-25 | 1985-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-25 | 1988-10-25 | 1989-04-26 | $7700.00 | Window Closed / Lapsed |