GB1465923A - Camouflaged speech signal transmission systems - Google Patents

Camouflaged speech signal transmission systems

Info

Publication number
GB1465923A
GB1465923A GB1188174A GB1188174A GB1465923A GB 1465923 A GB1465923 A GB 1465923A GB 1188174 A GB1188174 A GB 1188174A GB 1188174 A GB1188174 A GB 1188174A GB 1465923 A GB1465923 A GB 1465923A
Authority
GB
United Kingdom
Prior art keywords
speech
band
sub
modulated
transmission 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
GB1188174A
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.)
Siemens AG
Original Assignee
Siemens AG
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
Priority claimed from DE19732316647 external-priority patent/DE2316647C3/en
Application filed by Siemens AG filed Critical Siemens AG
Priority to IN1772/CAL/74A priority Critical patent/IN140135B/en
Publication of GB1465923A publication Critical patent/GB1465923A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K1/00—Secret communication
    • H04K1/04—Secret communication by frequency scrambling, i.e. by transposing or inverting parts of the frequency band or by inverting the whole band

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
  • Noise Elimination (AREA)

Abstract

1465923 Secrecy transmission systems SIEMENS AG 18 March 1974 [3 April 1973] 11881/74 Heading H4R In a speech secrecy transmission system in which sub-bands of the speech band are intercharged in a time-varying pattern, the speech content of one sub-band is replaced by a corresponding band of interference signals. The speech at E1 is modulated with fixed frequencies f1, f2, f4, f5, filtered F11, F12 and F14, F15 into sub-bands of 550 Hz or of varying width and are modulated again with frequencies f1 to f5 in a varying pattern controlled by unit U1. The central band 1350-1900 Hz which contains little intelligence is replaced by a noise signal G which is preferably derived from frequency division of a master oscillator providing the carriers so as to produce a harmonic series which varies at speech rhythm, has a level or duration dependent on speech level or duration and which may provide the pilot signal of a compander. At the receiver (Fig. 2, not shown) the signals are modulated in four modulators according to the transmission pattern, filtered and modulated again, no separate path for the central sub-band being provided till the interference band is suppressed in the receiver.
GB1188174A 1973-04-03 1974-03-18 Camouflaged speech signal transmission systems Expired GB1465923A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
IN1772/CAL/74A IN140135B (en) 1973-04-03 1974-08-07

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19732316647 DE2316647C3 (en) 1973-04-03 Method for the disguised transmission of speech signals

Publications (1)

Publication Number Publication Date
GB1465923A true GB1465923A (en) 1977-03-02

Family

ID=5876880

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1188174A Expired GB1465923A (en) 1973-04-03 1974-03-18 Camouflaged speech signal transmission systems

Country Status (14)

Country Link
AT (1) AT333851B (en)
AU (1) AU484739B2 (en)
BE (1) BE813245A (en)
CH (1) CH576215A5 (en)
DK (1) DK137000C (en)
FR (1) FR2224946B1 (en)
GB (1) GB1465923A (en)
IE (1) IE39093B1 (en)
IL (1) IL44495A (en)
IT (1) IT1011198B (en)
LU (1) LU69773A1 (en)
NL (1) NL167069C (en)
SE (1) SE397035B (en)
ZA (1) ZA742085B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2178235A1 (en) * 2008-10-17 2010-04-21 SignalGeneriX Ltd. Encryption of information signals
RU2602598C1 (en) * 2015-09-14 2016-11-20 Федеральное государственное казенное военное образовательное учреждение высшего профессионального образования "ВОЕННАЯ АКАДЕМИЯ СВЯЗИ имени Маршала Советского Союза С.М. Буденного" Министерства обороны Российской Федерации Method of generating and processing signal built in masking interference

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH596716A5 (en) * 1974-07-19 1978-03-15 Siemens Ag
DE3735781A1 (en) * 1987-10-22 1989-05-03 Grundig Emv METHOD FOR VOICE ENCRYPTION WITH SIMULTANEOUS DATA TRANSMISSION IN NARROW-BAND TRANSMISSION SYSTEMS

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2178235A1 (en) * 2008-10-17 2010-04-21 SignalGeneriX Ltd. Encryption of information signals
RU2602598C1 (en) * 2015-09-14 2016-11-20 Федеральное государственное казенное военное образовательное учреждение высшего профессионального образования "ВОЕННАЯ АКАДЕМИЯ СВЯЗИ имени Маршала Советского Союза С.М. Буденного" Министерства обороны Российской Федерации Method of generating and processing signal built in masking interference

Also Published As

Publication number Publication date
BE813245A (en) 1974-10-03
CH576215A5 (en) 1976-05-31
ATA270674A (en) 1976-04-15
DK137000C (en) 1978-05-29
NL7404542A (en) 1974-10-07
LU69773A1 (en) 1974-07-18
IT1011198B (en) 1977-01-20
IL44495A0 (en) 1974-06-30
IL44495A (en) 1977-01-31
AU484739B2 (en) 1975-10-02
NL167069C (en) 1981-10-15
AU6738374A (en) 1975-10-02
SE397035B (en) 1977-10-10
IE39093B1 (en) 1978-08-02
IE39093L (en) 1974-10-03
ZA742085B (en) 1975-03-26
DK137000B (en) 1977-12-27
AT333851B (en) 1976-12-10
FR2224946B1 (en) 1979-05-25
DE2316647B2 (en) 1975-10-30
FR2224946A1 (en) 1974-10-31
DE2316647A1 (en) 1974-10-17

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee