Patent US4592068A successfully refreshed from Google Patents.
US4592068A
Expired / Lapsed
US
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Repeater for a digital transmission system
Assignee: STC PLC
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Filing: 1983-03-28
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Granted: 1986-05-27
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Expires: 2003-03-28
Abstract
Abstract A repeater for PCM or digital transmission systems includes, in addition to the usual primary feedback control loop, a secondary feedback control loop having a low-pass filter and a peak detector to derive a control signal for a controllable impedance in the equalizer circuit. This control loop optimizes the repeater performance for different cable types and characteristics with regard to the low frequency energy content of the eye diagram.
Inventors
- 👤 Anthony Jessop
- 👤 Richard J. Catchpole
- 👤 Peter J. Dyke
- 👤 Brian S. Farley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:45
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/02; H04B3/36; H04B3/04; H04B3/06; H04B3/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
145 words
A repeater for a digital transmission line system comprising: an automatic line build out circuit having a primary equalization of feedback control loop coupled between an output of said line build out circuit and a first controllable impedance means connected in said line build out circuit; and an equalizer circuit having its output coupled to an input of said line build out circuit, said equalizer circuit having at least one secondary feedback control loop coupled to said output of said line build out circuit, said secondary loop including a filter coupled to said output of said line build out circuit and a first peak detector coupled to the output of said filter for sensing the peak amplitude of the equalized signal low frequency voltage developed at said filter output to produce a control signal to control a variable resistance means connected in said equalizer circuit.
Claim 2
Dependent Claim
145 words
A repeater for a digital transmission line system comprising: an automatic line build out circuit having a primary equalization of feedback control loop coupled between an output of said line build out circuit and a first controllable impedance means connected in said line build out circuit; and an equalizer circuit having its output coupled to an input of said line build out circuit, said equalizer circuit having at least one secondary feedback control loop coupled to said output of said line build out circuit, said secondary loop including a filter coupled to said output of said line build out circuit and a first peak detector coupled to the output of said filter for sensing the peak amplitude of the equalized signal low frequency voltage developed at said filter output to produce a control signal to control a variable resistance means connected in said equalizer circuit.
Claim 3
Dependent Claim
14 words
A repeater according to claim 1, wherein said filter is a low pass filter.
Claim 4
Dependent Claim
47 words
A repeater according to claim 1 or 2, wherein said primary loop includes a second peak detector having its input coupled to said output of said line build out circuit and its output coupled to said first controllable impedance means to control said line build out circuit.
References Cited (Backward Citations)
US3568100A
Cited
US3578914A
Cited
US3697875A
Cited
US4112368A
Cited
US3868576A
Cited
US3812436A
Cited
US3728649A
Cited
US4001525A
Cited
US4028644A
Cited
US3962549A
Cited
US4238648A
Cited
US4243956A
Cited
US4298983A
Cited
US4333063A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-05-26 | 1989-11-25 | 1990-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-26 | 1993-11-25 | 1994-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-26 | 1997-11-25 | 1998-05-27 | $7700.00 | Window Closed / Lapsed |