Patent US4232188A successfully refreshed from Google Patents.
US4232188A
Expired / Lapsed
US
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Circuit arrangement for receiving simplex and duplex current telegraph characters
Assignee: Siemens AG
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Filing: 1979-02-15
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Granted: 1980-11-04
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Expires: 1999-02-15
Abstract
Abstract A circuit arrangement for receiving simplex current and duplex current telegraph characters utilizes a series resistance in each of a plurality of telegraph lines. An operational amplifier is connected via switches to read the voltage drop across the line resistances and to signal such line conditions to an output circuit. The output circuit comprises a first differentiating circuit which passes the line conditions onto a bistable flip-flop, a monostable flip-flop operated by the first differentiating circuit to provide a timed trigger to a second differentiating circuit which triggers the bistable flip-flop into a condition indicative of the condition of the telegraph line being read.
Inventors
- 👤 Dieter Giersberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:36
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/02; H04L25/06; H03; H03K; H03K5/00; H03K5/125; H03K5/1252
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
176 words
A circuit arrangement for receiving single-current and double-current telegraph characters, comprising: telegraph line means for receiving telegraphic pulses; resistance means in said telegraph line means for carrying line current; an input circuit including amplifier means connected to evaluate the voltage drop across said resistance means; and an output circuit connected to said input circuit, including a first differentiating circuit operable in response to the output of said amplifier means to provide a first trigger signal, a monostable circuit connected to said first differentiating circuit and triggered thereby to provide a pulse of a predetermined length; a second differentiating circuit connected to said monostable circuit and operable to differentiate said pulse and provide a second trigger signal, and a bistable circuit connected to said second differentiating circuit and responsive to said second trigger signal to provide an output signal, whereby said monostable circuit, in response to each positive-going transition and each negative-going transition, and said bistable circuit in response to each negative-going transition from said monostable circuit provides the signal condition existing on the telegraph line means.
Claim 2
Dependent Claim
176 words
A circuit arrangement for receiving single-current and double-current telegraph characters, comprising: telegraph line means for receiving telegraphic pulses; resistance means in said telegraph line means for carrying line current; an input circuit including amplifier means connected to evaluate the voltage drop across said resistance means; and an output circuit connected to said input circuit, including a first differentiating circuit operable in response to the output of said amplifier means to provide a first trigger signal, a monostable circuit connected to said first differentiating circuit and triggered thereby to provide a pulse of a predetermined length; a second differentiating circuit connected to said monostable circuit and operable to differentiate said pulse and provide a second trigger signal, and a bistable circuit connected to said second differentiating circuit and responsive to said second trigger signal to provide an output signal, whereby said monostable circuit, in response to each positive-going transition and each negative-going transition, and said bistable circuit in response to each negative-going transition from said monostable circuit provides the signal condition existing on the telegraph line means.
Claim 3
Dependent Claim
112 words
The circuit arrangement set forth in claim 1, wherein: said telegraph line means comprises a plurality of telegraph lines for receiving telegraphic pulses; said resistance means comprises a plurality of resistances each connected in series with a respective telegraph line; said amplifier means comprises a plurality of operational amplifiers, each of said operational amplifiers including an input, an output, a feedback resistance connecting said output and said input, a differentiating circuit connected to said input, and an integrating element connected in parallel with said feedback resistance; and further comprising switching means operable to selectively connect said inputs of said operational amplifiers across said resistances which are serially connected with said telegraph lines.
Claim 4
Dependent Claim
19 words
The circuit arrangement set forth in claim 2, comprising an electrically separate current supply connected to said operational amplifiers.
Claim 5
Dependent Claim
96 words
The circuit arrangement set forth in claim 1, wherein the flip time of said monostable circuit is half the pulse duration of a telegraphic character received on said telegraphic line means, and wherein: said bistable circuit comprises a pair of set inputs; and said first differentiating circuit comprises a pair of transistors connected to and operated by said amplifier means and connected to respective ones of said set inputs whereby said bistable circuit is operated to a stable state in response to said second trigger signal and in dependence on the conductive states of said transistors.
Claim 6
Dependent Claim
23 words
The circuit arrangement set forth in claim 1, and further comprising: light coupling means connecting said amplifier means to said first differentiating circuit.
Claim 7
Dependent Claim
36 words
The circuit arrangement set forth in claim 1, comprising: electronic relay means connected to said bistable circuit and operable to produce start and stop polarity pulses in accordance with the operating state of said bistable circuit.
Claim 8
Dependent Claim
23 words
The circuit arrangement set forth in claim 6, wherein said electronic relay means comprises: an electromagnetic relay having a plurality of relay contacts.
Claim 9
Dependent Claim
88 words
The circuit arrangement set forth in claim 7, and further comprising: a monitor circuit including timing means connected to and operated with time delays by said relay contacts, and control switching means connected to and operated by said timing means, including switch contacts, for signaling polarity reversal signals; and a monitor machine including a monitor relay connected to and operated by one of said relay contacts via at least one of said switch contacts, and a monitor motor connected to and operated by some of said switch contacts.
Claim 10
Dependent Claim
35 words
The circuit arrangement set forth in claim 8, and further comprising: a switch in said control switching means connected in circuit with a voltage supply and operable to cause constant operation of said monitor motor.
Claim 11
Dependent Claim
19 words
The circuit arrangement set forth in claim 8, wherein said monitor machine is directly connected to said monitoring circuit.
Claim 12
Dependent Claim
89 words
The circuit arrangement set forth in claim 7, and further comprising: a monitor circuit including timing means connected to and operated with time delays by said relay contacts, and control switching means connected to and operated by said timing means, including switch contacts, for signaling polarity reversal signals; and monitor means including a monitor motor connected to and operated by some of said switch contacts, and a remotely located monitor relay connected to and operated by one of said relay contacts via at least one of said switch contacts.
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) | 1983-11-04 | 1984-05-05 | 1984-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-04 | 1988-05-05 | 1988-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-04 | 1992-05-05 | 1992-11-04 | $7700.00 | Window Closed / Lapsed |