US2144950A - Filter for separating high frequencies from low frequencies - Google Patents

Filter for separating high frequencies from low frequencies Download PDF

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Publication number
US2144950A
US2144950A US153072A US15307237A US2144950A US 2144950 A US2144950 A US 2144950A US 153072 A US153072 A US 153072A US 15307237 A US15307237 A US 15307237A US 2144950 A US2144950 A US 2144950A
Authority
US
United States
Prior art keywords
filter
low
wires
frequencies
high 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 - Lifetime
Application number
US153072A
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English (en)
Inventor
Wiessner Alfred
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.)
Alcatel Lucent Deutschland AG
C Lorenz AG
Original Assignee
Standard Elektrik Lorenz AG
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 Elektrik Lorenz AG filed Critical Standard Elektrik Lorenz AG
Application granted granted Critical
Publication of US2144950A publication Critical patent/US2144950A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B15/00—Suppression or limitation of noise or interference
    • H04B15/02—Reducing interference from electric apparatus by means located at or near the interfering apparatus
    • 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
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/65—Arrangements characterised by transmission systems for broadcast
    • H04H20/76—Wired systems
    • H04H20/77—Wired systems using carrier waves
    • H04H20/81—Wired systems using carrier waves combined with telephone network over which the broadcast is continuously available

Definitions

  • the subscriber's filter is composed inductances and short-circuiting condensers, both disposed in the low frequency wires, and of a filter to take the high frequency energy from the subscriber line.
  • the low-pass filter included in the low frequency wires, is arranged also to suppress any disturbing oscillations which seek to arise in the two wires in both phase coincidence and phase opposition.
  • high frequency and at the same time low frequency is supplied over the wires a, b.
  • the high frequency is conveyed over the high-pass filter l to a receiving arrangement such as a broadcast receiver 2, for instance.
  • the low frequency is conducted to the low frequency subscribers station, for instance a telephone station, over inductances 3, 4 each included in one of the two wires 0., b and each of which has a core of high frequency iron, and over inductances 'l, 8 which have one core common to them.
  • condensers 5, 6 are located 10 in order to short-circuit the high frequency.
  • the low-pass filter thus provided prevents the high frequency, which is arriving on the wires a, b, from passing to the low-frequency subscribers station 9.
  • the coils 3, 4, I, 8 and condenser 5, 6 cause the high frequency to be effectually attenuated.
  • the coils 1, 8 have a common core, their leakage thus being very low, disturbing voltages in phase coincidence in the two wires do not meet with any inductive resistance. They flow over the condensers 5, 6 to earth.
  • This arrangement thus acts in a very simple manner to combine the function of a low-pass filter with that of a filter circuit arranged to eliminate disturbances.
  • the low-pass filter comprises inductances included in each of the said line wires and each having a core of its own, and further comprises two condensers for short-circuiting said line wires 50 in high frequency fashion, and also comprises inductances included in each of said line wires and having one core common to them.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)
  • Train Traffic Observation, Control, And Security (AREA)
  • Filters And Equalizers (AREA)
US153072A 1936-09-04 1937-07-10 Filter for separating high frequencies from low frequencies Expired - Lifetime US2144950A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE501132X 1936-09-04

Publications (1)

Publication Number Publication Date
US2144950A true US2144950A (en) 1939-01-24

Family

ID=6545724

Family Applications (1)

Application Number Title Priority Date Filing Date
US153072A Expired - Lifetime US2144950A (en) 1936-09-04 1937-07-10 Filter for separating high frequencies from low frequencies

Country Status (4)

Country Link
US (1) US2144950A (en(2012))
FR (1) FR813929A (en(2012))
GB (1) GB501132A (en(2012))
NL (1) NL47533C (en(2012))

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3879736A (en) * 1972-05-10 1975-04-22 Hitachi Ltd High frequency-cut filter for a pen recorder
US4672337A (en) * 1985-11-27 1987-06-09 The United States Of America As Represented By The Secretary Of The Navy VLF/HF EMI filter
WO1994008417A1 (en) * 1992-09-25 1994-04-14 Tom Denedios Radio frequency interference filter
CN106330129A (zh) * 2016-08-31 2017-01-11 安徽赛福电子有限公司 一种高低频组合网络滤波器
US11585681B2 (en) * 2017-03-16 2023-02-21 Rosemount Measurement Limited Vibrating element apparatus

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3879736A (en) * 1972-05-10 1975-04-22 Hitachi Ltd High frequency-cut filter for a pen recorder
US4672337A (en) * 1985-11-27 1987-06-09 The United States Of America As Represented By The Secretary Of The Navy VLF/HF EMI filter
WO1994008417A1 (en) * 1992-09-25 1994-04-14 Tom Denedios Radio frequency interference filter
US6078662A (en) * 1992-09-25 2000-06-20 Denedios; Tom Radio frequency interference filter
CN106330129A (zh) * 2016-08-31 2017-01-11 安徽赛福电子有限公司 一种高低频组合网络滤波器
US11585681B2 (en) * 2017-03-16 2023-02-21 Rosemount Measurement Limited Vibrating element apparatus

Also Published As

Publication number Publication date
FR813929A (fr) 1937-06-11
NL47533C (en(2012))
GB501132A (en) 1939-02-21

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