GB1395565A - Secret transmission system - Google Patents

Secret transmission system

Info

Publication number
GB1395565A
GB1395565A GB4460772A GB4460772A GB1395565A GB 1395565 A GB1395565 A GB 1395565A GB 4460772 A GB4460772 A GB 4460772A GB 4460772 A GB4460772 A GB 4460772A GB 1395565 A GB1395565 A GB 1395565A
Authority
GB
United Kingdom
Prior art keywords
coder
signal
amplifiers
transmission ratios
echoes
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
GB4460772A
Other languages
English (en)
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.)
Philips Electronics UK Ltd
Original Assignee
Philips Electronic and Associated Industries 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 Philips Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB1395565A publication Critical patent/GB1395565A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K1/00—Secret communication
    • H04K1/06—Secret communication by transmitting the information or elements thereof at unnatural speeds or in jumbled order or backwards
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H17/00—Networks using digital techniques
    • H03H17/02—Frequency selective networks
    • H03H17/06—Non-recursive filters

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Mathematical Physics (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
  • Dc Digital Transmission (AREA)
GB4460772A 1971-09-30 1972-09-27 Secret transmission system Expired GB1395565A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7113389A NL7113389A (https=) 1971-09-30 1971-09-30

Publications (1)

Publication Number Publication Date
GB1395565A true GB1395565A (en) 1975-05-29

Family

ID=19814133

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4460772A Expired GB1395565A (en) 1971-09-30 1972-09-27 Secret transmission system

Country Status (5)

Country Link
JP (1) JPS4843861A (https=)
DE (1) DE2245072A1 (https=)
FR (1) FR2155438A5 (https=)
GB (1) GB1395565A (https=)
NL (1) NL7113389A (https=)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57113647A (en) * 1980-12-30 1982-07-15 Oikawa Hisao Signal concealing device

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5336439A (en) * 1976-09-16 1978-04-04 Mitsubishi Electric Corp Information processor
NL8001118A (nl) * 1980-02-25 1981-09-16 Philips Nv Inrichting voor het opnemen of weergeven van geluidstrillingen.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57113647A (en) * 1980-12-30 1982-07-15 Oikawa Hisao Signal concealing device

Also Published As

Publication number Publication date
NL7113389A (https=) 1973-04-03
FR2155438A5 (https=) 1973-05-18
JPS4843861A (https=) 1973-06-25
DE2245072A1 (de) 1973-04-05

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee