GB354790A - Improvements in telephone and like transmission systems - Google Patents
Improvements in telephone and like transmission systemsInfo
- Publication number
- GB354790A GB354790A GB14813/30A GB1481330A GB354790A GB 354790 A GB354790 A GB 354790A GB 14813/30 A GB14813/30 A GB 14813/30A GB 1481330 A GB1481330 A GB 1481330A GB 354790 A GB354790 A GB 354790A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relay
- path
- control apparatus
- transmission
- paths
- 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
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Interface Circuits In Exchanges (AREA)
- Optical Communication System (AREA)
Abstract
354,790. Two-way repeaters. STANDARD TELEPHONES & CABLES, Ltd., Columbia House, Aldwych. London.- (Western Electric Co., Inc. ; 195, Broadway, New York, U.S.A.) May 14, 1930, No. 14813. [Class 40 (iv).] In a two-way repeating system having echosuppressing apparatus located at or near each end, transmission in either path normally disables the other, but should transmission begin at both ends simultaneously, both paths are maintained in operative condition. At the west end of the system, the control apparatus comprises a relay R2 operated by currents over the path LL1 and adapted to short-circuit the path LL, and a relay R1 having opposing windings connected to both paths and adapted to prevent short-circuiting of the path LL. Similar control apparatus is located at the east end of the system. The purpose of the opposing lower winding of relay R1 is to prevent its possible operation by echo-currents before relay R2 pulls up. A delay circuit D may be inserted as shown. If two or more transmission circuits equipped in this manner are connected in tandem, the control apparatus at the junction points is removed. The invention may be applied to systems with a radio or submarine cable link in place of the four-wire section LL, LL1.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US390540A US1826196A (en) | 1929-09-05 | 1929-09-05 | Echo suppressor |
| US483784A US1840015A (en) | 1929-09-05 | 1930-09-23 | Transmission control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB354790A true GB354790A (en) | 1931-08-14 |
Family
ID=42041884
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9275/30A Expired GB351070A (en) | 1929-09-05 | 1930-03-22 | Switching arrangements for two-way telephone transmission systems |
| GB14813/30A Expired GB354790A (en) | 1929-09-05 | 1930-05-14 | Improvements in telephone and like transmission systems |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9275/30A Expired GB351070A (en) | 1929-09-05 | 1930-03-22 | Switching arrangements for two-way telephone transmission systems |
Country Status (6)
| Country | Link |
|---|---|
| US (2) | US1826196A (en) |
| BE (1) | BE373794A (en) |
| CH (1) | CH150480A (en) |
| DE (3) | DE595881C (en) |
| FR (1) | FR716100A (en) |
| GB (2) | GB351070A (en) |
-
1929
- 1929-09-05 US US390540A patent/US1826196A/en not_active Expired - Lifetime
-
1930
- 1930-03-22 GB GB9275/30A patent/GB351070A/en not_active Expired
- 1930-05-14 GB GB14813/30A patent/GB354790A/en not_active Expired
- 1930-05-24 CH CH150480D patent/CH150480A/en unknown
- 1930-08-01 DE DE1930I0040330 patent/DE595881C/en not_active Expired
- 1930-08-28 FR FR716100D patent/FR716100A/en not_active Expired
- 1930-09-23 US US483784A patent/US1840015A/en not_active Expired - Lifetime
- 1930-09-27 BE BE373794D patent/BE373794A/xx unknown
-
1931
- 1931-03-21 DE DEI41006D patent/DE596742C/en not_active Expired
- 1931-09-23 DE DEI42649D patent/DE596743C/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE596743C (en) | 1934-05-11 |
| US1826196A (en) | 1931-10-06 |
| FR716100A (en) | 1931-12-12 |
| BE373794A (en) | 1930-10-31 |
| CH150480A (en) | 1931-10-31 |
| US1840015A (en) | 1932-01-05 |
| DE595881C (en) | 1934-04-23 |
| GB351070A (en) | 1931-06-22 |
| DE596742C (en) | 1934-05-11 |
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