GB481085A - Improvements in or relating to two-wire-four-wire combinations in electric signalling systems - Google Patents
Improvements in or relating to two-wire-four-wire combinations in electric signalling systemsInfo
- Publication number
- GB481085A GB481085A GB22327/37A GB2232737A GB481085A GB 481085 A GB481085 A GB 481085A GB 22327/37 A GB22327/37 A GB 22327/37A GB 2232737 A GB2232737 A GB 2232737A GB 481085 A GB481085 A GB 481085A
- Authority
- GB
- United Kingdom
- Prior art keywords
- resistance
- rectifiers
- wire
- impedance
- signals
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/54—Circuits using the same frequency for two directions of communication
- H04B1/58—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
- Dc Digital Transmission (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
481,085. Two - - way transmission. SIEMENS & HALSKE AKT.-GES. Aug. 13, 1937, No. 22327. Convention date, Aug. 13, 1936. [Class 40 (iv)] The known arrangement shown in Fig. 3, in which balancing networks are avoided at the junction between a two-way line C and two oppositely directed one-way lines A, B with the aid of rectifiers G1, G2, G<1>1, G<1>2, arranged to block transmission from A to B, is modified by associating an impedance l, Fig. 8, with the input to the line C, so that the unidirectional voltages developed across this impedance, when signals arrive from A, bias the rectifiers G2, G<1>2 and so prevent signals from reaching B. The capacity of the rectifiers may be balanced by condensers Cl, C2. In a modification, Fig. 5 (not shown) the impedance is a single resistance connected between the mid point of the four-wire side of transformer U3 and the mid-points of the two-wire sides of transformers U1, U2. In a further modification, Fig. 7, such a resistance is divided into preferably equal parts r1, r2, by a connection to a circuit comprising inductance and resistance bridged across all the transformers. In another modification, Fig. 6 (not shown) resistance r2 is omitted and resistance r1 is replaced by a direct connection. In another modification, Fig. 9, the rectifiers are thermionic triodes which act as class " B " amplifiers to signals in the proper direction and are biassed further when signals arrive from A.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE481085X | 1936-08-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB481085A true GB481085A (en) | 1938-03-04 |
Family
ID=6542619
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB22327/37A Expired GB481085A (en) | 1936-08-13 | 1937-08-13 | Improvements in or relating to two-wire-four-wire combinations in electric signalling systems |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2169360A (en) |
| GB (1) | GB481085A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1011930B (en) * | 1954-02-26 | 1957-07-11 | Lorenz C Ag | Hybrid circuit with diodes for the transmission of electrical signals in two opposite directions |
| DE1034697B (en) * | 1955-11-03 | 1958-07-24 | Werner Jesek | Hybrid circuit for transferring two-wire circuits to four-wire circuits and vice versa |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE483501A (en) * | 1947-03-13 | |||
| US2885492A (en) * | 1952-08-30 | 1959-05-05 | Bell Telephone Labor Inc | Repeater systems employing non-reciprocal coupling devices |
| DE1024572B (en) * | 1954-09-15 | 1958-02-20 | Siemens Ag Albis | Circuit arrangement, in particular hybrid circuit for telecommunication devices |
| US3130274A (en) * | 1960-10-20 | 1964-04-21 | Itt | 2-or 4-wire telephone set |
| EP3164944B1 (en) * | 2014-07-01 | 2018-02-21 | Telefonaktiebolaget LM Ericsson (publ) | Hybrid coil circuit |
-
1937
- 1937-08-12 US US158729A patent/US2169360A/en not_active Expired - Lifetime
- 1937-08-13 GB GB22327/37A patent/GB481085A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1011930B (en) * | 1954-02-26 | 1957-07-11 | Lorenz C Ag | Hybrid circuit with diodes for the transmission of electrical signals in two opposite directions |
| DE1034697B (en) * | 1955-11-03 | 1958-07-24 | Werner Jesek | Hybrid circuit for transferring two-wire circuits to four-wire circuits and vice versa |
Also Published As
| Publication number | Publication date |
|---|---|
| US2169360A (en) | 1939-08-15 |
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