GB514893A - Improvements in electrical signalling systems - Google Patents

Improvements in electrical signalling systems

Info

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
Application number
GB1176638A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB1176638A priority Critical patent/GB514893A/en
Publication of GB514893A publication Critical patent/GB514893A/en
Expired legal-status Critical Current

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.
GB1176638A 1938-04-19 1938-04-19 Improvements in electrical signalling systems Expired GB514893A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (2)

* Cited by examiner, † Cited by third party
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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