Repeater for transmission lines
AssigneeLorain Products Corporation
InventorFrederick J. Kiko
Life of this patent
Estimating the term…
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.
Claims13
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.
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.
Dependencies are inferred from the claim text.