US4072820A
Expired / Lapsed
US
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Apparatus for coding input data characters
Assignee: Siemens AG
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Filing: 1976-09-24
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Granted: 1978-02-07
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Expires: 1996-09-24
Abstract
Abstract Apparatus for coding input data characters from a keyboard incorporates apparatus for recognizing characters which are to be represented by two successive code representations, rather than the usual single code representation for each character. When a two-code character is recognized, ordinary operation of the apparatus is inhibited, and an auxiliary counter is energized which, in conjunction with a fixed-value storage device, causes the plural code signals to be generated in the correct sequence, after which normal operation of the apparatus is resumed.
Inventors
- 👤 Gerd-Joachim Gunther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:16
CPC Classifications
H; H03; H03M; H03M11/00; H03M11/20; H04; H04L; H04L17/00; H04L17/02; G; G05; G05B; G05B2219/00; G05B2219/30; G05B2219/36; G05B2219/36006
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
165 words
Apparatus for the input coding of keyboard data characters comprising, a keyboard having a plurality of row lines and a plurality of column lines, means for interconnecting a row line with a column line in response to the depression of a key of the keyboard, counter means for sequentially manifesting coded representations of all of the keys of said keyboard, normally operative means for transmitting a said coded representation to an output at a time corresponding to the representation by said counter means of an operated key of said keyboard, detector means for detecting codes representative of special characters, means for inhibiting transmission of the special character-representative code, an auxiliary counter, means for initiating operation of the auxiliary counter in response to detection of a code representative of a special character, and means interconnected with said auxiliary counter for transmitting coded representations produced by said main counter at times when said representations correspond to plural code representations to be substituted for said special character-representative code.
Claim 2
Dependent Claim
165 words
Apparatus for the input coding of keyboard data characters comprising, a keyboard having a plurality of row lines and a plurality of column lines, means for interconnecting a row line with a column line in response to the depression of a key of the keyboard, counter means for sequentially manifesting coded representations of all of the keys of said keyboard, normally operative means for transmitting a said coded representation to an output at a time corresponding to the representation by said counter means of an operated key of said keyboard, detector means for detecting codes representative of special characters, means for inhibiting transmission of the special character-representative code, an auxiliary counter, means for initiating operation of the auxiliary counter in response to detection of a code representative of a special character, and means interconnected with said auxiliary counter for transmitting coded representations produced by said main counter at times when said representations correspond to plural code representations to be substituted for said special character-representative code.
Claim 3
Dependent Claim
88 words
Apparatus according to claim 1 including a decoding device connected to said main counter and responsive to coded representations produced thereby corresponding to special characters, an address-store unit connected to said decoding device and adapted to store an indication of a special character which has been detected, and a plurality of gates interconnected with said address-store unit and with said auxilliary counter for producing pulses simultaneously with the times that said main counter produces signals indicative of the coded representations to be substituted for said special character-representative code.
Claim 4
Dependent Claim
69 words
Apparatus according to claim 1 including means for deriving a pulse from said keyboard at the time said main counter produces a coded representation of an operated key, a gate connected to receive said pulse, the output of said gate being adapted to operate transmission gates for transmitting said coded representation to said output, and means for inhibiting said gate in response to the detection of a special character.
Claim 5
Dependent Claim
18 words
Apparatus according to claim 1, including gate means responsive to said auxiliary counter for resetting said auxiliary counter.
Claim 6
Dependent Claim
42 words
Apparatus according to claim 1 including multiplex means for successively scanning the keys of said keyboard and producing an output pulse at a time when an operated key has been scanned, said normally operative means being normally responsive to said output pulse
Claim 7
Dependent Claim
114 words
Apparatus for the coding of data characters comprising means for sequentially manifesting coded representations of characters, normally operative means for transmitting said coded representations to an output at a time corresponding to the manifestation of each of said representations, detector means for detecting codes representative of special characters, means for inhibiting transmission of the special character-representative code, an auxiliary counter, means for initiating operation of the auxiliary counter in response to detection of a code representative of a special character, and means interconnected with said auxiliary counter for transmitting coded representations produced by said main counter at times when said representations correspond to plural code representations to be substituted for said special character-representative code.
Claim 8
Dependent Claim
114 words
Apparatus for the coding of data characters comprising means for sequentially manifesting coded representations of characters, normally operative means for transmitting said coded representations to an output at a time corresponding to the manifestation of each of said representations, detector means for detecting codes representative of special characters, means for inhibiting transmission of the special character-representative code, an auxiliary counter, means for initiating operation of the auxiliary counter in response to detection of a code representative of a special character, and means interconnected with said auxiliary counter for transmitting coded representations produced by said main counter at times when said representations correspond to plural code representations to be substituted for said special character-representative code.
References Cited (Backward Citations)
US3778817A
Cited
US3996584A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-06 | 1981-08-08 | 1982-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-06 | 1985-08-08 | 1986-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-06 | 1989-08-08 | 1990-02-07 | $7700.00 | Window Closed / Lapsed |