US4037066A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Repeater for transmission lines
Assignee: Lorain Products Corp
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Filing: 1976-07-26
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Granted: 1977-07-19
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Expires: 1996-07-26
Abstract
Abstract A circuit for varying the amplification afforded to a-c signals transmitted through a transmission line in accordance with the length of that transmission line. Circuitry is provided which establishes a control signal which is a function of the a-c losses of the transmission line. This control signal is applied to an amplifying network which varies the amplification of signals transmitted through the transmission line in accordance with the magnitude of that control signal, and thereby automatically adjusts the repeater for operation with any transmission line to which it is connected.
Inventors
- 👤 Frederick J. Kiko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:54
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/02; H04B3/04; H04B3/16; H04B3/36
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
232 words
In an apparatus for modifying the transmission characteristics of a telephone transmission line, the combination of: shunt impedance simulating means for generating an impedance simulating current which varies in accordance with the signal voltage across the transmission line; series impedance simulating means for generating an impedance simulating voltage which varies in accordance with the signal current through the transmission line; means for applying a signal which varies in accordance with the signal voltage across the transmission line to the shunt impedance simulating means; means for applying a signal which varies in accordance with the signal current through the transmission line to the series impedance simulating means; means for applying the impedance simulating current in shunt with the transmission line; means for applying the impedance simulating voltage in series with the transmission line; control signal generating means for generating a control signal which varies in accordance with the a-c losses of the transmission line; the shunt impedance simulating means including first control signal responsive means connected to the control signal generating means, the first signal responsive means exhibiting a controllable impedance which varies the impedance simulating current in accordance with the control signal; and the series impedance simulating means including second control signal responsive means connected to the control signal generating means, the second signal responsive means exhibiting a controllable impedance which varies the impedance simulating voltage in accordance with the control signal.
Claim 2
Dependent Claim
232 words
In an apparatus for modifying the transmission characteristics of a telephone transmission line, the combination of: shunt impedance simulating means for generating an impedance simulating current which varies in accordance with the signal voltage across the transmission line; series impedance simulating means for generating an impedance simulating voltage which varies in accordance with the signal current through the transmission line; means for applying a signal which varies in accordance with the signal voltage across the transmission line to the shunt impedance simulating means; means for applying a signal which varies in accordance with the signal current through the transmission line to the series impedance simulating means; means for applying the impedance simulating current in shunt with the transmission line; means for applying the impedance simulating voltage in series with the transmission line; control signal generating means for generating a control signal which varies in accordance with the a-c losses of the transmission line; the shunt impedance simulating means including first control signal responsive means connected to the control signal generating means, the first signal responsive means exhibiting a controllable impedance which varies the impedance simulating current in accordance with the control signal; and the series impedance simulating means including second control signal responsive means connected to the control signal generating means, the second signal responsive means exhibiting a controllable impedance which varies the impedance simulating voltage in accordance with the control signal.
Claim 3
Dependent Claim
104 words
An apparatus as set forth in claim 1 wherein the control signal generating means comprises line resistance sensing means including: line voltage sensing means for sensing the voltage across the transmission line and for establishing a signal that varies in accordance therewith; line current sensing means for sensing the line current through the transmission line and for establishing a signal that varies in accordance therewith; and analog dividing means for generating a control signal proportional to the resistance of the transmission line by electronically dividing the signal established by the line voltage sensing means by the signal established by the line current sensing means.
Claim 4
Dependent Claim
38 words
An apparatus as set forth in claim 2 wherein the line current sensing means includes a Hall-effect device for establishing a signal which varies in accordance with the magnetic flux produced by the current in the transmission line.
Claim 5
Dependent Claim
35 words
An apparatus as set forth in claim 1 wherein the first and second control signal responsive means each include controllable impedance means for establishing an impedance which varies inversely in accordance with the control signal.
Claim 6
Dependent Claim
35 words
An apparatus as set forth in claim 1 wherein the first and second control signal responsive means each include controllable impedance means for establishing an impedance which varies directly in accordance with the control signal.
Claim 7
Dependent Claim
97 words
An apparatus as set forth in claim 1 wherein the first control signal responsive means includes first buffer means having a controllable output impedance for establishing an impedance which varies in accordance with the control signal to vary the impedance simulating current in accordance with the a-c losses of the transmission line, and wherein the second control signal responsive means includes second buffer means having a controllable output impedance for establishing an impedance which varies in accordance with the control signal to vary the impedance simulating voltage in accordance with the a-c losses of the transmission line.
Claim 8
Dependent Claim
242 words
In an apparatus for modifying the transmission characteristics of a telephone transmission line, the combination of: current driver means for generating an impedance simulating current, the current driver having an input and an output; voltage driver means for generating an impedance simulating voltage, the voltage driver means having an input and an output; signal voltage sensing means for sensing the signal voltage across the transmission line; signal current sensing means for sensing the signal current through the transmission line; means for applying the impedance simulating current at the output of the current driver means in shunt with the transmission line; means for applying the impedance simulating voltage at the output of the voltage driver means in series with the transmission line; line resistance sensing means for generating a control signal which varies in accordance with the resistance of the transmission line; a first controllable impedance network responsive to the control signal; means for connecting the first controllable impedance network between the signal voltage sensing means and the input of the current driver means to vary the magnitude of the impedance simulating current in accordance with the resistance of the transmission line; a second controllable impedance network responsive to the control signal; and means for connecting the second controllable impedance network between the signal current sensing means and the input of the voltage driver means to vary the magnitude of the impedance simulating voltage in accordance with the resistance of the transmission line.
Claim 9
Dependent Claim
242 words
In an apparatus for modifying the transmission characteristics of a telephone transmission line, the combination of: current driver means for generating an impedance simulating current, the current driver having an input and an output; voltage driver means for generating an impedance simulating voltage, the voltage driver means having an input and an output; signal voltage sensing means for sensing the signal voltage across the transmission line; signal current sensing means for sensing the signal current through the transmission line; means for applying the impedance simulating current at the output of the current driver means in shunt with the transmission line; means for applying the impedance simulating voltage at the output of the voltage driver means in series with the transmission line; line resistance sensing means for generating a control signal which varies in accordance with the resistance of the transmission line; a first controllable impedance network responsive to the control signal; means for connecting the first controllable impedance network between the signal voltage sensing means and the input of the current driver means to vary the magnitude of the impedance simulating current in accordance with the resistance of the transmission line; a second controllable impedance network responsive to the control signal; and means for connecting the second controllable impedance network between the signal current sensing means and the input of the voltage driver means to vary the magnitude of the impedance simulating voltage in accordance with the resistance of the transmission line.
Claim 10
Dependent Claim
87 words
A circuit as set forth in claim 7 wherein the line resistance sensing means includes, in combination: line voltage sensing means for sensing the instantaneous voltage across the transmission line and for establishing a line voltage signal which varies in accordance therewith; line current sensing means for sensing the instantaneous current through the transmission line and for establishing a line current signal which varies in accordance therewith; and analog dividing means for dividing the line voltage signal by the line current signal to establish a control signal.
Claim 11
Dependent Claim
32 words
An apparatus as set forth in claim 8 wherein the line current sensing means includes a Hall-effect device to which is applied the magnetic flux produced by the current in the line.
Claim 12
Dependent Claim
28 words
An apparatus as set forth in claim 7 wherein each controllable impedance network varies the magnitude of the impedance established thereby inversely in proportion to the control signal.
Claim 13
Dependent Claim
158 words
An apparatus as set forth in claim 10 wherein each controllable impedance network includes, in combination: a network output; an amplifier having an input and an output; fixed feedback means for establishing, at the input of the amplifier, a signal which varies in accordance with the voltage at the output of the amplifier; an analog divider having first and second inputs; the divider serving as means for establishing, at the input of the amplifier, a signal which varies directly in accordance with a signal at the first input of the divider and which varies inversely in accordance with a signal at the second input of the divider; means for establishing, at the first input of the divider, a signal which varies in accordance with the current at the output of the amplifier; means for connecting the output of the amplifier to the network output; and means for applying the control signal to the second input of the divider.
Claim 14
Dependent Claim
28 words
An apparatus as set forth in claim 7 wherein each controllable impedance network varies the magnitude of the impedance established thereby directly in proportion to the control signal.
Claim 15
Dependent Claim
157 words
An apparatus as set forth in claim 12 wherein each controllable network includes, in combination: a network output; an amplifier having an input and an output; fixed feedback means for establishing, at the input of the amplifier, a signal which varies in accordance with the voltage at the output of the amplifier; an analog multiplier having first and second inputs, the multiplier serving as means for establishing, at the input of the amplifier, a signal which varies directly in accordance with a signal at the first input of the multiplier and which varies inversely in accordance with the signal at the second input of the multiplier; means for establishing, at the first input of the multiplier a signal which varies in accordance with the current at the output of the amplifier; means for connecting the output of the amplifier to the network output; and means for applying the control signal to the second input of the multiplier.
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) | 1980-07-18 | 1981-01-17 | 1981-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-18 | 1985-01-17 | 1985-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-18 | 1989-01-17 | 1989-07-19 | $7700.00 | Window Closed / Lapsed |