[go: up one dir, main page]

JPS57113653A - Signal encryption device - Google Patents

Signal encryption device

Info

Publication number
JPS57113653A
JPS57113653A JP18624680A JP18624680A JPS57113653A JP S57113653 A JPS57113653 A JP S57113653A JP 18624680 A JP18624680 A JP 18624680A JP 18624680 A JP18624680 A JP 18624680A JP S57113653 A JPS57113653 A JP S57113653A
Authority
JP
Japan
Prior art keywords
signal
noise
objective
sequence
specified period
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.)
Pending
Application number
JP18624680A
Other languages
Japanese (ja)
Inventor
Kazushige Matsuyama
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
Priority to JP18624680A priority Critical patent/JPS57113653A/en
Publication of JPS57113653A publication Critical patent/JPS57113653A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K1/00—Secret communication
    • H04K1/02—Secret communication by adding a second signal to make the desired signal unintelligible

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)

Abstract

PURPOSE:To achieve encryption, by adding jamming noise with periodicity to a signal. CONSTITUTION:A signal (c) is generated by adding an objective signal (a) and a jamming noise (b). The artificulation of the signal (c) is remarkably low because of degraded S/N. Normal conversation can effectively be masked with 0-6dB of S/N. The objective signal (a) is produced by subtracting the noise (b) from the signal (c) for the restoration. The noise (b) must have a specified period T to introduce the signal (a) from the signal (c) at the restoration side without any a priori. That is, a noise generator PNG generates noise and PN sequence of a specified period, which are applied to an objective signal S. It can be superimposed on a marker P of impulsive shape indicating the start point of the PN sequence.
JP18624680A 1980-12-30 1980-12-30 Signal encryption device Pending JPS57113653A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18624680A JPS57113653A (en) 1980-12-30 1980-12-30 Signal encryption device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18624680A JPS57113653A (en) 1980-12-30 1980-12-30 Signal encryption device

Publications (1)

Publication Number Publication Date
JPS57113653A true JPS57113653A (en) 1982-07-15

Family

ID=16184900

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18624680A Pending JPS57113653A (en) 1980-12-30 1980-12-30 Signal encryption device

Country Status (1)

Country Link
JP (1) JPS57113653A (en)

Similar Documents

Publication Publication Date Title
JPS53129079A (en) Spectrum change monitoring system
ES2085954T3 (en) RADAR DEVICE WITH INTERFERENCE INDICATOR AND RECEIVING DEVICE WITH INTERFERENCE INDICATOR.
JPS57113653A (en) Signal encryption device
JPS5397714A (en) Signal holding circuit
IT7828126A0 (en) EQUIPMENT FOR NOISE REDUCTION IN DELTA MODULATORS.
JPS5366318A (en) Scramble system
JPS53123727A (en) Governor equipment of electric ignition type engine
JPS545371A (en) Drivng checking sysem for pulse transformer
JPS52151578A (en) Optical amplifier
JPS5436470A (en) Floating prevention device of nuclear fuel assembly
JPS543634A (en) Automatic noise reducer
JPS53133249A (en) Non-toxic stabilized composition of olefinic high polymer
JPS5210094A (en) Method of eliminating disturbance by reflection from sea surface
JPS52118297A (en) Distribution railing device
JPS5216923A (en) Noise suppressor
JPS51146869A (en) Peak tracking circuit
JPS5214851A (en) Arrester
JPS52151577A (en) Optical amplifier
JPS53136300A (en) System for guiding flying body
JPS53136427A (en) Optical regenerative equipment
JPS57105719A (en) Method and device for extracting single optical pulse
JPS5340567A (en) Abnormal waveform comparator
JPS5257737A (en) Pattern information detection unit
JPS5420698A (en) Detector for prevention
JPS53116704A (en) Sound synthesizer