GB364779A - Improvements in electric signalling systems - Google Patents
Improvements in electric signalling systemsInfo
- Publication number
- GB364779A GB364779A GB3671430A GB3671430A GB364779A GB 364779 A GB364779 A GB 364779A GB 3671430 A GB3671430 A GB 3671430A GB 3671430 A GB3671430 A GB 3671430A GB 364779 A GB364779 A GB 364779A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valves
- battery
- amplified
- signals
- series
- 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
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/18—Electrical details
- H04Q1/30—Signalling arrangements; Manipulation of signalling currents
- H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
- H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
- H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
- H04Q1/453—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Respiratory Apparatuses And Protective Means (AREA)
- Selective Calling Equipment (AREA)
Abstract
364,779. Electric signalling systems. GENERAL ELECTRIC CO., Ltd., Magnet House, Kingsway, London, MARRIS, G. C. and ESPLEY, D. C., of General Electric Co., Wembley, Middlesex. Dec. 5, 1930, No. 36714. [Class 40 (i).] In a system in which signalling is effected by voice frequency currents, the signals are amplified by indirectly heated valves with their filaments connected in series, the whole of the station battery being used for the filament and plate circuits. Four different frequencies are used in the embodiment described, the signals being received over circuit 1, pass through the appropriate filter network 3, are amplified by valves 5 and 7 and operate the appropriate relay 8 which controls contacts 9. The filaments of the valves are connected in series across the station battery, a resistance 13 being inserted in the circuit to compensate for the difference between the total filament voltage and the battery voltage. The battery also feeds the plate circuits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3671430A GB364779A (en) | 1930-12-05 | 1930-12-05 | Improvements in electric signalling systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3671430A GB364779A (en) | 1930-12-05 | 1930-12-05 | Improvements in electric signalling systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB364779A true GB364779A (en) | 1932-01-14 |
Family
ID=10390589
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3671430A Expired GB364779A (en) | 1930-12-05 | 1930-12-05 | Improvements in electric signalling systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB364779A (en) |
-
1930
- 1930-12-05 GB GB3671430A patent/GB364779A/en not_active Expired
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