Patent US4178569A successfully refreshed from Google Patents.
US4178569A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hybrid for two-wire full-duplex transmission of digital signals
Assignee: International Standard Electric Corp
•
Filing: 1978-03-20
•
Granted: 1979-12-11
•
Expires: 1998-03-20
Abstract
Abstract The hybrid includes a control circuit which automatically matches the impedance of the balancing network to the input impedance of the two-wire line connected to the hybrid. For control, rectified voltages present on the two-wire side and across the balancing network are averaged over time and the mean time values are compared.
Inventors
- 👤 Jorg Reutter
- 👤 Wolfgang Dietze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:43
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/02; H04L25/20; H04L25/22
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
108 words
A hybrid with a balancing network for connecting a transmitter and a receiver to a two-wire line having a given impedance for full-duplex transmission of digital signals comprising: a control circuit including first means coupled to said two-wire line to provide a first mean time value of voltage present on said two-wire line; second means coupled to said balancing network to provide a second mean time value of voltage appearing across said balancing network; and third means coupled to said first and second means to compare said first and second mean time value of voltages to generate a control signal to control the impedance of said balancing network.
Claim 2
Dependent Claim
108 words
A hybrid with a balancing network for connecting a transmitter and a receiver to a two-wire line having a given impedance for full-duplex transmission of digital signals comprising: a control circuit including first means coupled to said two-wire line to provide a first mean time value of voltage present on said two-wire line; second means coupled to said balancing network to provide a second mean time value of voltage appearing across said balancing network; and third means coupled to said first and second means to compare said first and second mean time value of voltages to generate a control signal to control the impedance of said balancing network.
Claim 3
Dependent Claim
21 words
A hybrid according to claim 1, wherein said first and second mean time value of voltages are arithmetic mean time values.
Claim 4
Dependent Claim
56 words
A hybrid according to claim 2, wherein said hybrid includes a resistance bridge circuit including said given impedance; and said third means controls the impedance of said balancing network so that said first means coupled to said given impedance provides said first mean time value of voltage equal to said second mean time value of voltage.
Claim 5
Dependent Claim
53 words
A hybrid according to claim 2, wherein said hybrid includes a hybrid transformer; and said third means controls the impedance of said balancing network so that said first and second mean time value of voltages are in a fixed ratio to each other determined by the number of turns of said hybrid transformer.
Claim 6
Dependent Claim
36 words
A hybrid according to claim 4, wherein said first means includes an additional transformer winding coupled to said hybrid transformer to provide a voltage having said fixed ratio to provide said first mean time value voltage.
Claim 7
Dependent Claim
35 words
A hybrid according to claim 4, wherein said first means includes a voltage divider coupled across said two-wire line to provide a voltage having said fixed ratio to provide said first mean time value voltage.
Claim 8
Dependent Claim
21 words
A hybrid according to claim 1, wherein said first and second mean time value of voltages are root-mean-square mean time values.
Claim 9
Dependent Claim
56 words
A hybrid according to claim 7, wherein said hybrid includes a resistance bridge circuit including said given impedance; and said third means controls the impedance of said balancing network so that said first means coupled to said given impedance provides said first mean time value of voltage equal to said second mean time value of voltage.
Claim 10
Dependent Claim
53 words
A hybrid according to claim 7, wherein said hybrid includes a hybrid transformer; and said third means controls the impedance of said balancing network so that said first and second mean time value of voltages are in a fixed ratio to each other determined by the number of turns of said hybrid transformer.
Claim 11
Dependent Claim
36 words
A hybrid according to claim 9, wherein said first means includes an additional transformer winding coupled to said hybrid transformer to provide a voltage having said fixed ratio to provide said first mean time value voltage.
Claim 12
Dependent Claim
35 words
A hybrid according to claim 9, wherein said first means includes a voltage divider coupled across said two-wire line to provide a voltage having said fixed ratio to provide said first mean time value voltage.
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) | 1982-12-10 | 1983-06-11 | 1983-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-10 | 1987-06-11 | 1987-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-10 | 1991-06-11 | 1991-12-11 | $7700.00 | Window Closed / Lapsed |