GB514893A - Improvements in electrical signalling systems - Google Patents
Improvements in electrical signalling systemsInfo
- Publication number
- GB514893A GB514893A GB1176638A GB1176638A GB514893A GB 514893 A GB514893 A GB 514893A GB 1176638 A GB1176638 A GB 1176638A GB 1176638 A GB1176638 A GB 1176638A GB 514893 A GB514893 A GB 514893A
- Authority
- GB
- United Kingdom
- Prior art keywords
- impedance
- auxiliary circuit
- resistance
- circuit
- auxiliary
- 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
- H04B3/04—Control of transmission; Equalising
- H04B3/14—Control of transmission; Equalising characterised by the equalising network used
- H04B3/143—Control of transmission; Equalising characterised by the equalising network used using amplitude-frequency equalisers
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
514,893. Transmission systems. STANDARD TELEPHONES & CABLES, Ltd., HODGSON, K. G., and ROCHE, A. H. April 19, 1938, No. 11766. Drawings to Specification. [Class 40 (iv)] An auxiliary circuit such as a monitoring circuit or a branch of a distribution system is coupled to a main transmission line by means of a transformer associated with a resistance (which may be the resistance of the secondary winding) in such a way that the impedance, looking back into the transformer &c., is equal to that of the input of the auxiliary circuit itself, or when a narrow band of frequencies is concerned, by means of a substantially self-terminated band pass filter, i.e., one in which the dissipative part of the impedance of the end arm (series or shunt) is equal to the derative impedance at that end at the mid-band frequency. In this case the impedance of the auxiliary circuit is adjusted so that the impedance looking back from the auxiliary circuit to the main circuit equals the impedance-of the auxiliary circuit if the resistive parts of the impedances of the arms nearest the main and auxiliary circuits respectively are regarded as belonging to such circuits and not to the filter. The Specification shows how to calculate the values of the resistance in the case of a filter of " constant k " type.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1176638A GB514893A (en) | 1938-04-19 | 1938-04-19 | Improvements in electrical signalling systems |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1176638A GB514893A (en) | 1938-04-19 | 1938-04-19 | Improvements in electrical signalling systems |
Publications (1)
Publication Number | Publication Date |
---|---|
GB514893A true GB514893A (en) | 1939-11-21 |
Family
ID=9992313
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1176638A Expired GB514893A (en) | 1938-04-19 | 1938-04-19 | Improvements in electrical signalling systems |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB514893A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0954114A2 (en) * | 1998-05-01 | 1999-11-03 | Berg Electronics Manufacturing B.V. | Linear attenuation equalizer and method for designing same |
-
1938
- 1938-04-19 GB GB1176638A patent/GB514893A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0954114A2 (en) * | 1998-05-01 | 1999-11-03 | Berg Electronics Manufacturing B.V. | Linear attenuation equalizer and method for designing same |
EP0954114A3 (en) * | 1998-05-01 | 2003-12-03 | Berg Electronics Manufacturing B.V. | Linear attenuation equalizer and method for designing same |
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