GB430567A - Improvements in or relating to telephone systems - Google Patents

Improvements in or relating to telephone systems

Info

Publication number
GB430567A
GB430567A GB13690/35A GB1369035A GB430567A GB 430567 A GB430567 A GB 430567A GB 13690/35 A GB13690/35 A GB 13690/35A GB 1369035 A GB1369035 A GB 1369035A GB 430567 A GB430567 A GB 430567A
Authority
GB
United Kingdom
Prior art keywords
networks
attenuation
relating
control voltage
telephone systems
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
GB13690/35A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB430567A publication Critical patent/GB430567A/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)
  • Interface Circuits In Exchanges (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)

Abstract

430,567. Two-way transmission. RYALL, L. E., 52, Crescent Gardens, Eastcote, Ruislip, Middlesex. Nov. 14, 1933, No. 13690/35. Divided out of 430,158. Drawings to Specification. [Class 40 (iv)] In a system in which a single control voltage controls the attenuation of two or more networks of a kind such as that described in Specification 413,383 in which an abrupt change in impedance takes place at a critical voltage, the networks are differently biassed initially and the control voltage is arranged to build up gradually so that the changes of attenuation of the various networks take place in succession. The detailed description is identical with that in Specification 430,158.
GB13690/35A 1933-11-14 1933-11-14 Improvements in or relating to telephone systems Expired GB430567A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB202982X 1933-11-14

Publications (1)

Publication Number Publication Date
GB430567A true GB430567A (en) 1935-06-14

Family

ID=10143647

Family Applications (2)

Application Number Title Priority Date Filing Date
GB31753/33A Expired GB430158A (en) 1933-11-14 1933-11-14 Improvements in or relating to telephone systems
GB13690/35A Expired GB430567A (en) 1933-11-14 1933-11-14 Improvements in or relating to telephone systems

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB31753/33A Expired GB430158A (en) 1933-11-14 1933-11-14 Improvements in or relating to telephone systems

Country Status (7)

Country Link
US (1) US2082357A (en)
BE (1) BE406242A (en)
CH (1) CH202982A (en)
DE (1) DE677043C (en)
FR (1) FR781186A (en)
GB (2) GB430158A (en)
NL (1) NL40266C (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE744088C (en) * 1938-05-10 1944-01-08 Siemens Ag Loudspeaker system with feedback lock
DE882420C (en) * 1938-04-12 1953-07-09 Siemens Ag Circuit arrangement for feedback locks in loudspeaker systems
DE890062C (en) * 1936-10-14 1953-09-17 Siemens Ag Circuit arrangement for preventing electroacoustic feedback, especially in loudspeaker systems

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE759529C (en) * 1940-04-26 1954-05-03 Hell Rudolf Dr Ing Feedback lock
DE896058C (en) * 1941-02-21 1953-11-09 Electrical Fono Films Co As Dynamic control circuit with adjustable degree of control
GB561405A (en) * 1942-11-14 1944-05-18 Automatic Telephone & Elect Improvements in or relating to telecommunication systems
US2696529A (en) * 1950-09-02 1954-12-07 Bell Telephone Labor Inc Voice-operated switching system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE890062C (en) * 1936-10-14 1953-09-17 Siemens Ag Circuit arrangement for preventing electroacoustic feedback, especially in loudspeaker systems
DE882420C (en) * 1938-04-12 1953-07-09 Siemens Ag Circuit arrangement for feedback locks in loudspeaker systems
DE744088C (en) * 1938-05-10 1944-01-08 Siemens Ag Loudspeaker system with feedback lock

Also Published As

Publication number Publication date
BE406242A (en)
DE677043C (en) 1939-06-17
NL40266C (en)
US2082357A (en) 1937-06-01
CH202982A (en) 1939-02-15
FR781186A (en) 1935-05-10
GB430158A (en) 1935-06-14

Similar Documents

Publication Publication Date Title
GB1186904A (en) Transmission
GB430567A (en) Improvements in or relating to telephone systems
GB416372A (en) Improvements in or relating to the control of attenuation in alternating current transmission systems such as telephone or like systems
GB1106860A (en) Improvements in or relating to time division communication systems
GB788594A (en) Improvements in or relating to automatic telecommunication exchange systems
GB598225A (en) Improvements in or relating to telecommunication systems
GB541761A (en) Electrical calculating apparatus
AU282903B2 (en) Improvements. in or relating to microwave transmission systems
GB514099A (en) Improvements in or relating to long distance telephony systems
GB556927A (en) Improvements in or relating to the construction of selector switches as used in automtic telephone and like systems
CA721855A (en) Variable transmission line coupler
CA592970A (en) Variable impedance transmission line
GB642541A (en) Improvements in or relating to telecommunication exchanges and to operators' switchboards therefor
GB556920A (en) Improvements in or relating to selector operating circuits for use in automatic telephone or like systems
AU3484850A (en) Improvements in duplex telephone transmission systems
GB556921A (en) Improvements in or relating to circuit arrangements for selector switches for use in automatic telephone or like systems
CA412135A (en) Telegraphic transmission by space discharge control
GB628177A (en) Improvements in or relating to telecommunication switching systems
AU152517B2 (en) Improvements in or relating to variable magnification optical systems
AU115425B2 (en) Improvements in or relating to selector switches such asare used in automatic telephone systems
AU295944B2 (en) Improvements in or relating to continuously variable ratio transmission units
CA476115A (en) Telephone transmission systems
GB703265A (en) Improvements in or relating to electrical power transmission systems
CA396401A (en) Single channel two-way communication system
AU1421852A (en) Improvements in or relating to voice switching in telephone transmission systems