GB353630A - - Google Patents
Info
- Publication number
- GB353630A GB353630A GB18103/30A GB1810330A GB353630A GB 353630 A GB353630 A GB 353630A GB 18103/30 A GB18103/30 A GB 18103/30A GB 1810330 A GB1810330 A GB 1810330A GB 353630 A GB353630 A GB 353630A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signalling
- amplifiers
- separate
- bands
- class
- 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
- H04J—MULTIPLEX COMMUNICATION
- H04J1/00—Frequency-division multiplex systems
- H04J1/02—Details
- H04J1/04—Frequency-transposition arrangements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Radio Relay Systems (AREA)
Abstract
353,630. Wired wireless signalling. SIEMENS & HALSKE AKT.-GES., Siemensstadt, Berlin. June 12, 1930, No, 18103. Convention date, July 26, 1929. [Class 40 (v).] In a two-way carrier telephone, signalling system using differing frequency bands for the two directions the bands consist of sidebands of carrier frequencies which lie between the bands. A singlecarrier frequency may be used with the upper sideband for one direction and the lower sideband for the other direction. Common amplifiers V may be used at the intermediate repeaters with separate filters O, U, Fig. 3, or separate amplifiers may be used, Fig. 4, Phase compensation is preferably introduced at points where the channels are separate but attenuation may be equalized at the intermediate or terminal amplifiers. To prevent crosstalk the same frequency is used for both directions in adjacent lines and in a quad circuit the side circuits are used for the carrier signalling. Specifications 291,110 and 335,108, [both in Class 40 (v), Wireless signalling &c.], are referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE697483X | 1929-07-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB353630A true GB353630A (en) | 1931-07-30 |
Family
ID=6607938
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB18103/30A Expired GB353630A (en) | 1929-07-26 | 1930-06-12 |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR697483A (en) |
| GB (1) | GB353630A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE767662C (en) * | 1936-06-20 | 1953-03-16 | Lorenz C Ag | Method for the transmission of messages to subscribers who are connected via two-wire lines to exchanges which are interconnected by means of four-wire lines |
-
1930
- 1930-06-12 GB GB18103/30A patent/GB353630A/en not_active Expired
- 1930-06-16 FR FR697483D patent/FR697483A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE767662C (en) * | 1936-06-20 | 1953-03-16 | Lorenz C Ag | Method for the transmission of messages to subscribers who are connected via two-wire lines to exchanges which are interconnected by means of four-wire lines |
Also Published As
| Publication number | Publication date |
|---|---|
| FR697483A (en) | 1931-01-19 |
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