GB714458A - Improvements relating to multi-channel communication systems - Google Patents
Improvements relating to multi-channel communication systemsInfo
- Publication number
- GB714458A GB714458A GB1118552A GB1118552A GB714458A GB 714458 A GB714458 A GB 714458A GB 1118552 A GB1118552 A GB 1118552A GB 1118552 A GB1118552 A GB 1118552A GB 714458 A GB714458 A GB 714458A
- Authority
- GB
- United Kingdom
- Prior art keywords
- channels
- communication
- amplifier
- modulator
- terminated
- 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
- H04J1/10—Intermediate station arrangements, e.g. for branching, for tapping-off
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radio Relay Systems (AREA)
Abstract
714,458. Multiplex systems. SIEMENS BROS. & CO., Ltd. May 1, 1953 [May 2, 1952], No. 11185/52. Class 40 (4) In a multi-channel alternating current telegraph system wherein some of the channels are terminated at an intermediate station and the same frequency range is used for communication in the same direction over another part of the system, inter action is prevented by modulating all the signal currents received at the intermediate station so that the frequency bands of the terminated cha,nnels are transposed to a position outside, but adjacent to, the communication band. In one example an eighteen channel system extending over a range of frequencies 420-2460 c.p.s., six channels 420-1020 c.p.s. are received in apparatus R after amplification in amplifier A1, and the whole eighteen channels are also passed via a modulator M and a filter F to an output amplifier AZ. The modulator is fed by a 3600 c.p.s. oscillator and the lower side-bands 1140-3180 are selected by the filter. Six additional channels originating from a sender T and occupying the frequency band 420-1020 c.p.s. are also applied to the amplifier A2 for communication in the same direction.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1118552A GB714458A (en) | 1952-05-02 | 1952-05-02 | Improvements relating to multi-channel communication systems |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1118552A GB714458A (en) | 1952-05-02 | 1952-05-02 | Improvements relating to multi-channel communication systems |
Publications (1)
Publication Number | Publication Date |
---|---|
GB714458A true GB714458A (en) | 1954-08-25 |
Family
ID=9981579
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1118552A Expired GB714458A (en) | 1952-05-02 | 1952-05-02 | Improvements relating to multi-channel communication systems |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB714458A (en) |
-
1952
- 1952-05-02 GB GB1118552A patent/GB714458A/en not_active Expired
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