CA1054689A - Automatic impedance modification of transmission lines - Google Patents

Automatic impedance modification of transmission lines

Info

Publication number
CA1054689A
CA1054689A CA257989A CA257989A CA1054689A CA 1054689 A CA1054689 A CA 1054689A CA 257989 A CA257989 A CA 257989A CA 257989 A CA257989 A CA 257989A CA 1054689 A CA1054689 A CA 1054689A
Authority
CA
Canada
Prior art keywords
impedance
line
signal
signals
control signal
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
CA257989A
Other languages
English (en)
French (fr)
Inventor
Henry W. Ott
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.)
AT&T Corp
Original Assignee
Western Electric Co Inc
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 Western Electric Co Inc filed Critical Western Electric Co Inc
Application granted granted Critical
Publication of CA1054689A publication Critical patent/CA1054689A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/40—Artificial lines; Networks simulating a line of certain length

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Networks Using Active Elements (AREA)
CA257989A 1975-08-08 1976-07-28 Automatic impedance modification of transmission lines Expired CA1054689A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/602,988 US4004102A (en) 1975-08-08 1975-08-08 Automatic impedance modification of transmission lines

Publications (1)

Publication Number Publication Date
CA1054689A true CA1054689A (en) 1979-05-15

Family

ID=24413589

Family Applications (1)

Application Number Title Priority Date Filing Date
CA257989A Expired CA1054689A (en) 1975-08-08 1976-07-28 Automatic impedance modification of transmission lines

Country Status (6)

Country Link
US (1) US4004102A (enExample)
AU (1) AU500854B2 (enExample)
CA (1) CA1054689A (enExample)
DE (1) DE2635021A1 (enExample)
FR (1) FR2320669A1 (enExample)
GB (1) GB1544866A (enExample)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4181824A (en) * 1978-10-10 1980-01-01 Bell Telephone Laboratories, Incorporated Balancing impedance circuit
DK143627C (da) * 1978-10-30 1982-02-15 Rovsing A S Koblingskreds til overfoering af datasignaler med stor hastighed
US4273963A (en) * 1979-05-25 1981-06-16 Bell Telephone Laboratories, Incorporated Automatic equalization for digital transmission systems
US4289933A (en) * 1979-10-15 1981-09-15 Bell Telephone Laboratories, Incorporated Dial pulse detection
JPS6181062A (ja) * 1984-09-28 1986-04-24 Toshiba Corp 局線インタフエイス回路
EP0439641B1 (de) * 1990-01-29 1994-03-23 Siemens Aktiengesellschaft Verfahren und Anordnung zur Bildung des Leitungsabschlusses einer Telefonleitung
JP2999214B2 (ja) * 1990-03-02 2000-01-17 株式会社東芝 伝送入出力回路
US5282157A (en) * 1990-09-13 1994-01-25 Telecom Analysis Systems, Inc. Input impedance derived from a transfer network
US5195045A (en) * 1991-02-27 1993-03-16 Astec America, Inc. Automatic impedance matching apparatus and method
US5249225A (en) * 1991-10-25 1993-09-28 Coherent Communications Systems Corp. Self-balancing hybrid using digitally programmable attenuator for variable impedance elements
US5258713A (en) * 1992-04-16 1993-11-02 Northern Telecom Limited Impedance generator for a telephone line interface circuit
US5471527A (en) 1993-12-02 1995-11-28 Dsc Communications Corporation Voice enhancement system and method
SE507739C2 (sv) * 1996-11-08 1998-07-06 Ericsson Telefon Ab L M Anordning vid en linjekrets för mätning av linjespänning
US6198817B1 (en) * 1998-01-23 2001-03-06 International Business Machines Corporation Communication interface having combined shaping of receive response and synthesized matching terminating impedances for different frequency bands and a design method therefor
US6434232B1 (en) * 1999-08-23 2002-08-13 Intersil Corporation Apparatus and method for measuring loop impedance
IL166445A (en) * 2005-01-23 2011-07-31 Mosaid Technologies Inc A standard and method for evaluating the termination of a transmission line based on the determination of a typical impedance
WO2018151218A1 (ja) * 2017-02-20 2018-08-23 株式会社村田製作所 フィルタ装置、マルチプレクサ、高周波フロントエンド回路、および通信装置
CN117330799B (zh) * 2023-11-28 2024-03-01 深圳市鼎阳科技股份有限公司 一种阻抗匹配电路、差分探头及示波器

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1164931A (en) * 1967-01-04 1969-09-24 Standard Telephones Cables Ltd Automatic Regulation of Telephone Sets.
US3578914A (en) * 1969-04-09 1971-05-18 Lynch Communication Systems Equalizer with automatic line build-out
US3671676A (en) * 1969-12-17 1972-06-20 Bell Telephone Labor Inc Subscriber loop range extender
US3706862A (en) * 1971-06-28 1972-12-19 Lorain Prod Corp Amplifier circuit for transmission lines
US3818151A (en) * 1973-01-26 1974-06-18 Lorain Prod Corp Method and apparatus for amplifying signal transmission through transmission lines

Also Published As

Publication number Publication date
FR2320669B1 (enExample) 1980-04-25
DE2635021A1 (de) 1977-02-24
AU1656476A (en) 1978-02-09
AU500854B2 (en) 1979-06-07
GB1544866A (en) 1979-04-25
FR2320669A1 (fr) 1977-03-04
US4004102A (en) 1977-01-18

Similar Documents

Publication Publication Date Title
CA1054689A (en) Automatic impedance modification of transmission lines
US3973089A (en) Adaptive hybrid circuit
US4273963A (en) Automatic equalization for digital transmission systems
PL127642B1 (en) Network for automatic correction of signals for telephone systems
US4472608A (en) Subscriber line interface circuit
US4103118A (en) Autobalance hybrid circuit
US4074087A (en) Bidirectional voice frequency repeater
US4331842A (en) Voice frequency repeater and term sets and other circuits therefor
FI63141C (fi) Elektronisk telefonkrets
GB1310377A (en) Telephone set speech networks
US5249224A (en) Methods and apparatus for providing reciprocal impedance conversion
US3204048A (en) Negative impedance repeaters for non-loaded lines
CA1078536A (en) Bilateral voice-signal controller for use in the two-wire portion of the telephone circuit
CA1155937A (en) Hybrid circuit
US3989906A (en) Repeater for transmission lines
US3083265A (en) Conference call circuit
US4037066A (en) Repeater for transmission lines
US2209955A (en) Wave translation system
US5191300A (en) Local area network amplifier for twisted pair lines
US3814866A (en) Negative resistance repeater
GB362472A (en) Improvements in electrical transmission devices
US3904838A (en) Two-wire, bi-directional voice frequency repeater
US3742153A (en) Telephone circuit for sidetone balance and automatic transmission level adjustment
US4135064A (en) Impedance compensation of transmission line
US4942603A (en) Methods and apparatus for providing reciprocal impedance conversion