GB413621A - Improvements in electric filter circuits - Google Patents

Improvements in electric filter circuits

Info

Publication number
GB413621A
GB413621A GB2835132A GB2835132A GB413621A GB 413621 A GB413621 A GB 413621A GB 2835132 A GB2835132 A GB 2835132A GB 2835132 A GB2835132 A GB 2835132A GB 413621 A GB413621 A GB 413621A
Authority
GB
United Kingdom
Prior art keywords
inductances
telephone
filter
oct
transformers
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
GB2835132A
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Priority to GB2835132A priority Critical patent/GB413621A/en
Publication of GB413621A publication Critical patent/GB413621A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/17—Structural details of sub-circuits of frequency selective networks
    • H03H7/1741—Comprising typical LC combinations, irrespective of presence and location of additional resistors
    • H03H7/1758—Series LC in shunt or branch path
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/0115—Frequency selective two-port networks comprising only inductors and capacitors

Abstract

413,621. Impedance networks. TELEFONAKTIEBOLAGET L. M. ERICSSON, 33, Kungsgatan, Stockholm. Oct. 11, 1932, No. 28351. Void [Abridged as open to inspection under Sect. 91 of the Acts, Oct. 31, 1932]. [Classes 40 (iii) and 40 (v).] The inductances forming a filter in a balanced circuit have the form of two oppositely connected transformers, in order that the balance may not be destroyed by the effect of disturbance currents or of signal currents on the value of the inductances. The Figure shows a telephone station D with high-pass filter HF using the same line l as two telegraph stations A, B, with low-pass filter LF. The inductances of the latter filter comprise two transformers M1, M2, having equal coils which are oppositely connected as shown. The system is symmetrically earthed at the mid points of the shunt impedances. A similar arrangement may be applied to a system comprising a telephone phantom circuit with two telephone side circuits on which carrier telephony is superimposed. (Fig. 3, not shown).
GB2835132A 1932-10-11 1932-10-11 Improvements in electric filter circuits Expired GB413621A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2835132A GB413621A (en) 1932-10-11 1932-10-11 Improvements in electric filter circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2835132A GB413621A (en) 1932-10-11 1932-10-11 Improvements in electric filter circuits

Publications (1)

Publication Number Publication Date
GB413621A true GB413621A (en) 1934-07-19

Family

ID=10274287

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2835132A Expired GB413621A (en) 1932-10-11 1932-10-11 Improvements in electric filter circuits

Country Status (1)

Country Link
GB (1) GB413621A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3452300A (en) * 1965-08-11 1969-06-24 Merrimac Research & Dev Inc Four port directive coupler having electrical symmetry with respect to both axes

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3452300A (en) * 1965-08-11 1969-06-24 Merrimac Research & Dev Inc Four port directive coupler having electrical symmetry with respect to both axes

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