GB212261A - Method and means for the prevention of listening in telephonic and telegraphic intercourse by means of electric waves and for multiplex intercourse by means of electromagnetic waves - Google Patents

Method and means for the prevention of listening in telephonic and telegraphic intercourse by means of electric waves and for multiplex intercourse by means of electromagnetic waves

Info

Publication number
GB212261A
GB212261A GB515624A GB515624A GB212261A GB 212261 A GB212261 A GB 212261A GB 515624 A GB515624 A GB 515624A GB 515624 A GB515624 A GB 515624A GB 212261 A GB212261 A GB 212261A
Authority
GB
United Kingdom
Prior art keywords
intercourse
discharge tube
plate
separate
multiplex
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
GB515624A
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 GB212261A publication Critical patent/GB212261A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/005—Control of transmission; Equalising
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/04—Distributors combined with modulators or demodulators
    • H04J3/042—Distributors with electron or gas discharge tubes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/04—Distributors combined with modulators or demodulators
    • H04J3/045—Distributors with CRT

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Radio Relay Systems (AREA)

Abstract

212,261. Kramolin, L. L. de. March 3, 1923, [Convention date]. Void [Published under Sect. 91 of the Act]. Secret and selective signalling systems; multiplex systems.-The plate of an electric discharge tube is divided into segments 1 - - 4, Fig. 3, which are traversed in succession by the cathode stream, the path of the stream through the tube being controlled by an external rotating field derived from an harmonic of the signal frequency and maintained in synchrony at the transmitting and receiving stations. Each plate segment is connected to a separate receiving circuit T<1> - - T<4>, whereby four separate signals can be received simultaneously, the interval between successive impacts of the cathode stream on any particular segment being super-audible. At the transmitting end, the discharge tube is provided with four separate grids, each fed by its own microphone under the control of the external rotary field. To ensure secrecy, disturbing noises may be imposed on the circuits not used for signalling; or the plate segments may be arranged asymmetrically. A mercury vapour lamp may be used in place of a discharge tube.
GB515624A 1923-03-03 1924-02-28 Method and means for the prevention of listening in telephonic and telegraphic intercourse by means of electric waves and for multiplex intercourse by means of electromagnetic waves Expired GB212261A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEK85159D DE398789C (en) 1923-03-03 1923-03-03 Method and device for preventing eavesdropping on telephone and telegraph traffic by means of electrical waves and for multiple traffic by means of electromagnetic waves

Publications (1)

Publication Number Publication Date
GB212261A true GB212261A (en) 1925-01-22

Family

ID=33006158

Family Applications (1)

Application Number Title Priority Date Filing Date
GB515624A Expired GB212261A (en) 1923-03-03 1924-02-28 Method and means for the prevention of listening in telephonic and telegraphic intercourse by means of electric waves and for multiplex intercourse by means of electromagnetic waves

Country Status (2)

Country Link
DE (1) DE398789C (en)
GB (1) GB212261A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE941493C (en) * 1937-06-18 1956-04-12 Int Standard Electric Corp Pulse generation system for a message transmission system working with pulse time modulation
DE971422C (en) * 1937-11-19 1959-01-29 Int Standard Electric Corp High-frequency communication system in which the messages are transmitted by means of time-modulated pulses
US9980947B2 (en) 2014-12-18 2018-05-29 Genentech, Inc. Tetrahydro-pyrido[3,4-b]indole estrogen receptor modulators and uses thereof

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE742863C (en) * 1938-04-22 1943-12-13 Philips Patentverwaltung Circuit arrangement for multiple telephony
DE740604C (en) * 1938-04-23 1943-10-25 Philips Patentverwaltung Multiple telephony system
NL154169B (en) * 1949-06-23 Chemetron Corp HOLDER FILLING MACHINE.
US2732493A (en) * 1950-11-04 1956-01-24 baker
NL192755A (en) * 1953-11-30
DE1022128B (en) * 1955-04-14 1958-01-02 Siemens Ag Circuit arrangement for the cyclical transmission of measured values
DE1043878B (en) * 1956-12-04 1958-11-13 Forsch Physik Cathode ray tube for the multiple display of measurement voltages

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE941493C (en) * 1937-06-18 1956-04-12 Int Standard Electric Corp Pulse generation system for a message transmission system working with pulse time modulation
DE971422C (en) * 1937-11-19 1959-01-29 Int Standard Electric Corp High-frequency communication system in which the messages are transmitted by means of time-modulated pulses
US9980947B2 (en) 2014-12-18 2018-05-29 Genentech, Inc. Tetrahydro-pyrido[3,4-b]indole estrogen receptor modulators and uses thereof
US10966963B2 (en) 2014-12-18 2021-04-06 Genentech, Inc. Tetrahydro-pyrido[3,4-b]indole estrogen receptor modulators and uses thereof

Also Published As

Publication number Publication date
DE398789C (en) 1924-07-15

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