FR619976A - Improvements in methods used for noise reduction in telephone circuits - Google Patents

Improvements in methods used for noise reduction in telephone circuits

Info

Publication number
FR619976A
FR619976A FR619976DA FR619976A FR 619976 A FR619976 A FR 619976A FR 619976D A FR619976D A FR 619976DA FR 619976 A FR619976 A FR 619976A
Authority
FR
France
Prior art keywords
noise reduction
methods used
telephone circuits
telephone
circuits
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
Other languages
French (fr)
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.)
Thales SA
Original Assignee
Le Materiel Telephonique Thomson CSF
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 Le Materiel Telephonique Thomson CSF filed Critical Le Materiel Telephonique Thomson CSF
Application granted granted Critical
Publication of FR619976A publication Critical patent/FR619976A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/30—Reducing interference caused by unbalanced currents in a normally balanced line

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
FR619976D 1925-10-07 1926-08-06 Improvements in methods used for noise reduction in telephone circuits Expired FR619976A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US61101A US1586633A (en) 1925-10-07 1925-10-07 Drainage method for four-wire-cable systems

Publications (1)

Publication Number Publication Date
FR619976A true FR619976A (en) 1927-04-13

Family

ID=22033591

Family Applications (1)

Application Number Title Priority Date Filing Date
FR619976D Expired FR619976A (en) 1925-10-07 1926-08-06 Improvements in methods used for noise reduction in telephone circuits

Country Status (5)

Country Link
US (1) US1586633A (en)
BE (1) BE336761A (en)
DE (1) DE484766C (en)
FR (1) FR619976A (en)
GB (1) GB259546A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107569229B (en) * 2017-09-04 2021-02-02 歌尔科技有限公司 Biological impedance measuring method and device and electronic equipment

Also Published As

Publication number Publication date
GB259546A (en) 1927-05-12
US1586633A (en) 1926-06-01
BE336761A (en)
DE484766C (en) 1929-10-22

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