Patent US4583235A successfully refreshed from Google Patents.
US4583235A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-adjusting equalizer configuration which automatically adjusts to the cable length
Assignee: Siemens AG
•
Filing: 1983-10-27
•
Granted: 1986-04-15
•
Expires: 2003-10-27
Abstract
Abstract The invention involves a self-adjusting equalizer configuration which automatically adjusts to the cable length. The equalizer configuration has band limitation for the transmission of digital signals and consists of an equalizing amplifier, a correction filter, and an amplitude control loop with a comparison of actual and nominal values. The object of the invention is to specify a circuit in which the correction filter is not located in the signal path. This object is achieved in such a way that the equalizing amplifier is located in the signal path, and the correction filter is placed in the amplitude control loop so that the output signal of this correction filter represents the actual value for the amplitude control loop.
Inventors
- 👤 Josef Domer
- 👤 Hans G. Harle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:29
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/02; H04L25/03; H04L25/03878; H04L25/03006; H04L25/03012; H04L25/03019; H04L25/12
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
125 words
A self-adjusting equalizer for automatically adjusting to a cable length comprising band limitation means for transmitting digital signals, the band limitation means including an equalizing amplifier, a correction filter and an amplitude control circuit for controlling the output of the equalizing amplifier characterized by the equalizing amplifier (1) having an output which is connected to an input of the correction filter (6) which is within an amplitude control-loop (2,2'), the input signal to the correction filter being the output signal of the equalizing amplifier, the output signal of the correction filter representing the control signal for controlling the amplitude control circuit and also for controlling a time recovery means (4) for a discriminator (3) having an input connected to the output of the equalizing amplifier.
Claim 2
Dependent Claim
125 words
A self-adjusting equalizer for automatically adjusting to a cable length comprising band limitation means for transmitting digital signals, the band limitation means including an equalizing amplifier, a correction filter and an amplitude control circuit for controlling the output of the equalizing amplifier characterized by the equalizing amplifier (1) having an output which is connected to an input of the correction filter (6) which is within an amplitude control-loop (2,2'), the input signal to the correction filter being the output signal of the equalizing amplifier, the output signal of the correction filter representing the control signal for controlling the amplitude control circuit and also for controlling a time recovery means (4) for a discriminator (3) having an input connected to the output of the equalizing amplifier.
Claim 3
Dependent Claim
61 words
The equalizer configuration according to claims 1, wherein the circuit configuration and size of said correction filter is selected so that it has the following transfer function ##EQU10## where V o is basic amplification, f 1 the cut-off frequency of a low pass filter, and f R the resonant frequency of a tuned circuit, with a and b as its constants.
References Cited (Backward Citations)
US3578914A
Cited
US3763359A
Cited
US4003006A
Cited
US4243956A
Cited
US4298983A
Cited
US4251782A
Cited
GB2068196A
Cited
US4430744A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-04-14 | 1989-10-14 | 1990-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-14 | 1993-10-14 | 1994-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-14 | 1997-10-14 | 1998-04-15 | $7700.00 | Window Closed / Lapsed |