GB371664A - Improvements in and relating to echo-eliminating arrangements in electric transmission systems - Google Patents
Improvements in and relating to echo-eliminating arrangements in electric transmission systemsInfo
- Publication number
- GB371664A GB371664A GB16825/31A GB1682531A GB371664A GB 371664 A GB371664 A GB 371664A GB 16825/31 A GB16825/31 A GB 16825/31A GB 1682531 A GB1682531 A GB 1682531A GB 371664 A GB371664 A GB 371664A
- Authority
- GB
- United Kingdom
- Prior art keywords
- path
- coil
- short
- speech
- circuited
- 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)
Abstract
371,664. Two - way transmission. LIGNES TELEGRAPHIQUES ET TELEPHONIQUES, 26, Rue de la PÚpiniÞre, Paris. June 9, 1931, No. 16825. Convention date, July 3, 1930. [Class 40 (iv).] Each path of a four-wire system is effectively short-circuited when speech is passing in the other path by shunt-connected coils 3, the impedance of which is reduced owing to the saturation of the core 4 by rectified speech currents in coil 5. The control action may be ratarded by a further coil 7 short-circuited through a variable resistance 8, or by delay networks in the circuit of coil 5. The Specification as open to inspection under Sect. 91 (3) (a) comprises also an arrangement, Fig. 2 (Cancelled), in which the short-circuiting of each path is effected by a discharge tube 9 rendered conducting when speech occurs in the other path by the potential produced across a resistance 11. A condenser 12 delays the control action. This subject-matter does not appear in the Specification as accepted.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR371664X | 1930-07-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB371664A true GB371664A (en) | 1932-04-28 |
Family
ID=8894717
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB16825/31A Expired GB371664A (en) | 1930-07-03 | 1931-06-09 | Improvements in and relating to echo-eliminating arrangements in electric transmission systems |
Country Status (3)
| Country | Link |
|---|---|
| BE (1) | BE380454A (en) |
| FR (1) | FR714251A (en) |
| GB (1) | GB371664A (en) |
-
0
- FR FR714251D patent/FR714251A/fr not_active Expired
- BE BE380454D patent/BE380454A/xx unknown
-
1931
- 1931-06-09 GB GB16825/31A patent/GB371664A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| BE380454A (en) | |
| FR714251A (en) | 1931-11-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB471632A (en) | Improvements in and relating to apparatus for electrically analysing the frequencies of oscillations of any kind | |
| GB371664A (en) | Improvements in and relating to echo-eliminating arrangements in electric transmission systems | |
| GB535181A (en) | Improvements in or relating to electrical coupling circuits | |
| GB397551A (en) | Improvements in electrical impedance networks and amplifiers | |
| GB587576A (en) | High-frequency attenuator and divider circuits | |
| DE726012C (en) | Arrangement for dividing a common transmission path into three mutually decoupled separate paths | |
| GB897613A (en) | Improvements in or relating to voice-frequency amplifiers | |
| GB361144A (en) | Improvements in or relating to electrical sound transmission systems | |
| AT102196B (en) | Control circuit for a signal line, in which an extension with transmitter and receiver is arranged. | |
| GB378077A (en) | Improvements relating to radio frequency signalling systems | |
| DE579312C (en) | Ungrounded receiver or amplifier circuit | |
| GB375346A (en) | Improvements in audio frequency signalling systems | |
| DE505911C (en) | Circuit arrangement for telecommunication systems, in which the opposite direction is blocked by the telecommunication streams of one transmission direction | |
| GB449381A (en) | Improvements in and relating to push-pull and like amplifying systems | |
| AT102051B (en) | Auxiliary amplifier device. | |
| DE725939C (en) | Receiver, in particular target flight receiver, with a low frequency tube, the external resistance of which consists of several indicators (telephone, display instrument) | |
| GB461360A (en) | Improvements in or relating to wireless receiving circuits and the like | |
| GB450241A (en) | Push-pull detector for television purposes | |
| GB498439A (en) | Improvements in electric transmission circuits | |
| AT109834B (en) | Device for reducing the effects of echoes in telephone lines. | |
| GB505492A (en) | Electric wave amplifying systems | |
| GB461256A (en) | Improvements in or relating to radio receiving apparatus | |
| GB412678A (en) | Improvements in and relating to thermionic amplifiers | |
| DE1938211A1 (en) | Circuit arrangement for forming a monitoring loop in line amplifiers | |
| CH198016A (en) | Radio receiving circuit with means for at least partial suppression of short-term interference. |