GB431794A - Improvements in or relating to electric communication systems - Google Patents

Improvements in or relating to electric communication systems

Info

Publication number
GB431794A
GB431794A GB1618/34A GB161834A GB431794A GB 431794 A GB431794 A GB 431794A GB 1618/34 A GB1618/34 A GB 1618/34A GB 161834 A GB161834 A GB 161834A GB 431794 A GB431794 A GB 431794A
Authority
GB
United Kingdom
Prior art keywords
relating
communication systems
electric communication
jan
acoustic frequency
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
GB1618/34A
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.)
CARLO CARNEVALI
EMANUELE BOSELLI
Original Assignee
CARLO CARNEVALI
EMANUELE BOSELLI
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 CARLO CARNEVALI, EMANUELE BOSELLI filed Critical CARLO CARNEVALI
Publication of GB431794A publication Critical patent/GB431794A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K1/00—Secret communication
    • H04K1/006—Secret communication by varying or inverting the phase, at periodic or random intervals

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Toys (AREA)
  • Small-Scale Networks (AREA)

Abstract

431,794. Secret transmission. BOSELLI, E., 110, Via Frattina, and CARNEVALI, C., 157, Viale Regina Margherita, both in Rome. Jan. 16, 1934, No. 1618. Convention date, Jan. 18, 1933. [Class 40 (iv)] [See also Group XL] Acoustic frequency signals are reversed in phase at an ultra-acoustic frequency by a device 41 at a signal transmitter and restored to their original form at the receiver by a device 42 synchronous with the phasereverser at the transmitter, artificial disturbances being superimposed on the line 39 from a source 40 for rendering the communication secret.
GB1618/34A 1933-01-18 1934-01-16 Improvements in or relating to electric communication systems Expired GB431794A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT431794X 1933-01-18

Publications (1)

Publication Number Publication Date
GB431794A true GB431794A (en) 1935-07-16

Family

ID=11254797

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1618/34A Expired GB431794A (en) 1933-01-18 1934-01-16 Improvements in or relating to electric communication systems

Country Status (2)

Country Link
FR (1) FR768022A (en)
GB (1) GB431794A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2425020A (en) * 1943-04-16 1947-08-05 Standard Telephones Cables Ltd Interference reducing radio system
US2472706A (en) * 1943-07-03 1949-06-07 Rca Corp Pulse transmission system
BE479062A (en) * 1944-04-20

Also Published As

Publication number Publication date
FR768022A (en) 1934-07-30

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