GB384849A - Improvements in or relating to electric telecommunication systems - Google Patents

Improvements in or relating to electric telecommunication systems

Info

Publication number
GB384849A
GB384849A GB5265/32A GB526532A GB384849A GB 384849 A GB384849 A GB 384849A GB 5265/32 A GB5265/32 A GB 5265/32A GB 526532 A GB526532 A GB 526532A GB 384849 A GB384849 A GB 384849A
Authority
GB
United Kingdom
Prior art keywords
relating
telephony
harmonics
telegraphy
common channel
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
GB5265/32A
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.)
Lignes Telegraphiques et Telephoniques LTT SA
Original Assignee
Lignes Telegraphiques et Telephoniques LTT SA
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 Lignes Telegraphiques et Telephoniques LTT SA filed Critical Lignes Telegraphiques et Telephoniques LTT SA
Publication of GB384849A publication Critical patent/GB384849A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
    • H04M11/062—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors using different frequency bands for speech and other data

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

384,849. Superposed telephony and telegraphy. LIGNES TELEGRAPHIQUES ET TELEPHONIQUES, 26, Rue de la Pepiniere, Paris. Feb. 22, 1932, No. 5265. Convention date, March 14, 1931. [Class 40 (iv).] In a system in which telephony A and carrier telegraphy B are transmitted over a common channel C, the voltage of the telephone signals is limited by means 4 such as a discharge device in order to prevent the formation at loading or repeater points in the common channel of harmonics lying within the telegraphic band. The limiting means 4 is preferably inserted prior to the filter 2 in order to suppress any harmonics which it may itself produce.
GB5265/32A 1931-03-14 1932-02-22 Improvements in or relating to electric telecommunication systems Expired GB384849A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR569033X 1931-03-14

Publications (1)

Publication Number Publication Date
GB384849A true GB384849A (en) 1932-12-15

Family

ID=8948887

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5265/32A Expired GB384849A (en) 1931-03-14 1932-02-22 Improvements in or relating to electric telecommunication systems

Country Status (3)

Country Link
DE (1) DE569033C (en)
FR (2) FR729462A (en)
GB (1) GB384849A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1280280B (en) * 1966-06-29 1968-10-17 Siemens Ag Method and circuit arrangement for the mutual transmission of pulse-coded messages between subscriber stations via a voice channel

Also Published As

Publication number Publication date
DE569033C (en) 1933-01-27
FR729462A (en) 1932-07-25
FR713555A (en) 1931-11-06

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