GB498627A - Improvements in high frequency signalling systems - Google Patents
Improvements in high frequency signalling systemsInfo
- Publication number
- GB498627A GB498627A GB32725/37A GB3272537A GB498627A GB 498627 A GB498627 A GB 498627A GB 32725/37 A GB32725/37 A GB 32725/37A GB 3272537 A GB3272537 A GB 3272537A GB 498627 A GB498627 A GB 498627A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lines
- transformers
- those
- group
- nov
- 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
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/65—Arrangements characterised by transmission systems for broadcast
- H04H20/76—Wired systems
- H04H20/77—Wired systems using carrier waves
- H04H20/81—Wired systems using carrier waves combined with telephone network over which the broadcast is continuously available
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
498,627. Distributing music &c. LORENZ AKT.-GES., C. Nov. 26, 1937, No. 32725. Convention date, Nov. 27, 1936. [Class 40 (iv)] In the distribution of programmes at highfrequency over lines, for example telephone lines, the lines are grouped in accordance with their attenuation, those having the largest attenuation being fed from the power amplifier or group of transmitters 1 via a single matching transformer 2, those of the next group via transformers 2, 4 in tandem and those of the next via transformers 2, 4, 6. Each of the lines is given a standard impedance looking from the transformer secondaries by the provision of a filter A. The ratios of the transformers are chosen so that their effective impedance looking from the transmitter is the same as the standard impedance of a single line in the preceding group. The groups may comprise sub-groups associated through additional transformers connected in place of one or more of the filters A. The lines are fed symmetrically to avoid induction on other lines.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE498627X | 1936-11-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB498627A true GB498627A (en) | 1939-01-11 |
Family
ID=20310732
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB32725/37A Expired GB498627A (en) | 1936-11-27 | 1937-11-26 | Improvements in high frequency signalling systems |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US2208916A (en) |
| BE (1) | BE424554A (en) |
| FR (1) | FR828734A (en) |
| GB (1) | GB498627A (en) |
| NL (1) | NL50604C (en) |
-
0
- BE BE424554D patent/BE424554A/xx unknown
- NL NL50604D patent/NL50604C/xx active
-
1937
- 1937-11-05 FR FR828734D patent/FR828734A/en not_active Expired
- 1937-11-13 US US174379A patent/US2208916A/en not_active Expired - Lifetime
- 1937-11-26 GB GB32725/37A patent/GB498627A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR828734A (en) | 1938-05-27 |
| BE424554A (en) | |
| NL50604C (en) | |
| US2208916A (en) | 1940-07-23 |
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