GB459779A - Improvements in or relating to alternating current signalling systems - Google Patents

Improvements in or relating to alternating current signalling systems

Info

Publication number
GB459779A
GB459779A GB1679135A GB1679135A GB459779A GB 459779 A GB459779 A GB 459779A GB 1679135 A GB1679135 A GB 1679135A GB 1679135 A GB1679135 A GB 1679135A GB 459779 A GB459779 A GB 459779A
Authority
GB
United Kingdom
Prior art keywords
way
relating
alternating current
road
networks
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
GB1679135A
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.)
Telephone Manufacturing Co Ltd
Original Assignee
Telephone Manufacturing Co Ltd
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 Telephone Manufacturing Co Ltd filed Critical Telephone Manufacturing Co Ltd
Priority to GB1679135A priority Critical patent/GB459779A/en
Publication of GB459779A publication Critical patent/GB459779A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other

Landscapes

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

Abstract

459,779. Two - way transmission. TELEPHONE MANUFACTURING CO., Ltd., Hollingsworth Works, Martell Road, West Dulwich, and PADDLE, L. H., 92, Lancaster Road, West Norwood, both in London. June 11, 1935, No. 16791. [Class 40 (iv)] In a two-way telephone system, particularly for use with loud-speaking receivers, an auxiliary control current for echo-suppressing purposes is generated by a separate microphone CM consisting, for example, of a tuned reed actuated by a diaphragm. The system shown comprises attenuating networks T1- T4 in the speech and control paths, controlled in pairs by a rectifier-valve arrangement VI, V2 similar to that described in Specification 451,496. A similar arrangement of four networks is described for a two-way repeater.
GB1679135A 1935-06-11 1935-06-11 Improvements in or relating to alternating current signalling systems Expired GB459779A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1679135A GB459779A (en) 1935-06-11 1935-06-11 Improvements in or relating to alternating current signalling systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1679135A GB459779A (en) 1935-06-11 1935-06-11 Improvements in or relating to alternating current signalling systems

Publications (1)

Publication Number Publication Date
GB459779A true GB459779A (en) 1937-01-11

Family

ID=10083720

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1679135A Expired GB459779A (en) 1935-06-11 1935-06-11 Improvements in or relating to alternating current signalling systems

Country Status (1)

Country Link
GB (1) GB459779A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1100314B (en) * 1957-02-13 1961-02-23 Taylor Projection lens

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1100314B (en) * 1957-02-13 1961-02-23 Taylor Projection lens

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