Patent EP0645727A2 successfully refreshed from Google Patents.
US3798549A
Expired / Lapsed
US
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Apparatus for transmitting data over radio connections
Assignee: Siemens AG
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Filing: 1972-04-13
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Granted: 1974-03-19
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Expires: 1992-04-13
Abstract
Abstract Circuitry is described which facilitates data transmission over radio links by preventing receiver errors, even when call addresses are distorted. The incoming call addresses consisting of several characters are applied to transmission lines, one of which is assigned to each character. The latter character lines are connected to a character counter, over an output of which a call address signal is emitted when all characters of a given call address are received in proper succession. The call address is coupled to an address counter which emits a counter signal when it receives a certain number of call address signals within a prescribed time. By means of this counter signal, a switch is operated to effect the transmission of the received data from the receiver to the data terminal.
Inventors
- 👤 O Kvale
- 👤 M Ollinger
- 👤 W Markwitz
- 👤 D Niethammer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:07
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/28; H04L12/40; H04L12/40006; H04L12/40013; H04W; H04W8/00; H04W8/26
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
140 words
Apparatus for receiving data transmissions from radio links including a receiver with the output of the receiver being coupled to a data terminal, said data including call addresses constituted by a plurality of characters, the apparatus being responsive to a predetermined call address, the apparatus comprising: a plurality of character lines individually assigned to a character in said call address, first counter means connected to receive the outputs of said character lines for emitting a first signal when all characters of said call address are received in the predetermined succession, second counter means for receiving said first signal, for counting said first signals and for emitting a second signal upon counting a predetermined number of said first signals within a predetermined time period, and switch means, operative responsive to said second signal, for connecting said receiver to said data terminal.
Claim 2
Dependent Claim
140 words
Apparatus for receiving data transmissions from radio links including a receiver with the output of the receiver being coupled to a data terminal, said data including call addresses constituted by a plurality of characters, the apparatus being responsive to a predetermined call address, the apparatus comprising: a plurality of character lines individually assigned to a character in said call address, first counter means connected to receive the outputs of said character lines for emitting a first signal when all characters of said call address are received in the predetermined succession, second counter means for receiving said first signal, for counting said first signals and for emitting a second signal upon counting a predetermined number of said first signals within a predetermined time period, and switch means, operative responsive to said second signal, for connecting said receiver to said data terminal.
Claim 3
Dependent Claim
115 words
The apparatus defined in claim 1 further comprising: a pulse generator for producing character pulses and wherein said first counter comprises: a switching stage having a number of stable states corresponding to the number of characters in said call address, said switching stage being switched to successive stable states responsive to said character pulses, said stable states corresponding to successive characters in said call address and logic circuit means for comparing the received character signals with the stable state reached by said switching stage for resetting said switching stage when the received character and stable state do not agree and for causing the next succeeding stable state to be switched in when there is agreement.
Claim 4
Dependent Claim
18 words
The apparatus defined in claim 2 wherein said switching stage comprises a series connection of bistable switching means.
Claim 5
Dependent Claim
39 words
The apparatus defined in claim 1 further comprising: time measuring means and wherein said second counter is connected to said time measuring means as to be reset thereby when said time measuring means has measured a predetermined time period.
Claim 6
Dependent Claim
31 words
The apparatus defined in claim 4 wherein said time measuring means is a counter operating responsive to said character signals and produces an output signal upon reaching a predetermined counting state.
Claim 7
Dependent Claim
32 words
The apparatus defined in claim 4 wherein said time measuring means includes means for adjusting the length of said predetermined time period responsive to the noise level on the radio transmission path.
Claim 8
Dependent Claim
64 words
The apparatus defined in claim 1 further comprising: a shift register for receiving the call address characters from the receiver and having a number of register positions corrEsponding to the anticipated number of characters, first means for coupling said register positions individually to ones of said character lines and second means for coupling said register positions individually to further ones of said character lines.
Claim 9
Dependent Claim
31 words
The apparatus defined in claim 5 further comprising: control means interposed between said first coupling means and said first counter means for switching the received call addresses to said first counter.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |