GB420255A - Improvements in or relating to electrical filter circuits - Google Patents

Improvements in or relating to electrical filter circuits

Info

Publication number
GB420255A
GB420255A GB2987633A GB2987633A GB420255A GB 420255 A GB420255 A GB 420255A GB 2987633 A GB2987633 A GB 2987633A GB 2987633 A GB2987633 A GB 2987633A GB 420255 A GB420255 A GB 420255A
Authority
GB
United Kingdom
Prior art keywords
impedance
filters
parallel
reactive component
frequency
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
GB2987633A
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.)
General Electric Co PLC
Original Assignee
General Electric Co 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 General Electric Co PLC filed Critical General Electric Co PLC
Priority to GB2987633A priority Critical patent/GB420255A/en
Priority to DEG89062D priority patent/DE671797C/en
Publication of GB420255A publication Critical patent/GB420255A/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
    • H03H7/0115—Frequency selective two-port networks comprising only inductors and capacitors
    • 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
    • H03H7/1791—Combined LC in shunt or branch path

Abstract

420,255. Impedance networks. GENERAL ELECTRIC CO., Ltd., Magnet House, Kingsway, London, and FARREN, L. I., c/o General Electric Co., Wembley, Middlesex. Oct. 27, 1933, No. 29876. Drawings to Specification. [Classes 40 (iii) and 40 (v)] Relates to systems in which either the input terminals or the output terminals of a number of filters are connected in parallel, and comprises means for neutralizing the reactive component of the impedance presented by the group of filters as a whole. For instance, in a set of filters whose input terminals are connected in parallel for the purpose of separating the channels in a multiplex voice-frequency telegraph system, the impedance facing the amplifier which feeds the system should be a constant resistance. Each individual filter offers substantially this resistance within its pass range, but any given frequency lies outside the pass range of all but one of the filters. The remaining filters therefore produce at this frequency a reactive component in the total impedance. This is neutralized by connecting in parallel a reaction network whose impedance is substantially equal and opposite at all frequencies to the reactive component of the existing impedance, so as to produce an antiresonant effect. Two examples of a network suitable for use where twelve harmonic channels are used and comprising two inductances and a condenser are given in the Specification.
GB2987633A 1933-10-27 1933-10-27 Improvements in or relating to electrical filter circuits Expired GB420255A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB2987633A GB420255A (en) 1933-10-27 1933-10-27 Improvements in or relating to electrical filter circuits
DEG89062D DE671797C (en) 1933-10-27 1934-10-28 Electrical filter switch with several filters of the same structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2987633A GB420255A (en) 1933-10-27 1933-10-27 Improvements in or relating to electrical filter circuits

Publications (1)

Publication Number Publication Date
GB420255A true GB420255A (en) 1934-11-28

Family

ID=10298624

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2987633A Expired GB420255A (en) 1933-10-27 1933-10-27 Improvements in or relating to electrical filter circuits

Country Status (2)

Country Link
DE (1) DE671797C (en)
GB (1) GB420255A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL85464C (en) * 1951-03-13

Also Published As

Publication number Publication date
DE671797C (en) 1939-02-14

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