Amplifiers – Variable impedance for signal channel controlled by separate... – Electron tube or diode as impedance
Patent
1979-02-26
1981-02-10
Mullins, James B.
Amplifiers
Variable impedance for signal channel controlled by separate...
Electron tube or diode as impedance
330149, 330284, 333 18, H03G 924
Patent
active
042504597
ABSTRACT:
A circuit arrangement for automatic distortion correction of a signal transmitted over a line having low-pass filter characteristics, employs a distortion corrector having a controllable high-pass filter and a controllable-gain amplifier. The distortion corrector includes the high-pass filter with a predetermined frequency characteristic and a first attenuator connected in series therewith in a first branch, and a two-terminal network of a predetermined frequency characteristic in a second branch. The controlled-gain amplifier includes a second attenuator and an amplifier connected in series therewith which effects a predetermined amplification. The current/voltage characteristics of the first and second attenuators are substantially identical and their attenuation depends on a signal which is derived from the distortion-correct signal by means of rectification and smoothing.
REFERENCES:
patent: 3728649 (1973-04-01), Waldhauer
patent: 3824501 (1974-07-01), Harris
patent: 3965436 (1976-06-01), Dixon
patent: 4045748 (1977-08-01), Filliman
patent: 4061970 (1977-12-01), Magneron
patent: 4101849 (1978-07-01), Blackmer et al.
Mullins James B.
Siemens Aktiengesellschaft
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