IE39093B1 - Camouflaged speech signal transmission systems - Google Patents
Camouflaged speech signal transmission systemsInfo
- Publication number
- IE39093B1 IE39093B1 IE628/74A IE62874A IE39093B1 IE 39093 B1 IE39093 B1 IE 39093B1 IE 628/74 A IE628/74 A IE 628/74A IE 62874 A IE62874 A IE 62874A IE 39093 B1 IE39093 B1 IE 39093B1
- Authority
- IE
- Ireland
- Prior art keywords
- speech
- band
- sub
- modulated
- transmission systems
- Prior art date
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.
[GB1465923A]
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 (2)
| Publication Number | Publication Date |
|---|---|
| IE39093L IE39093L (en) | 1974-10-03 |
| IE39093B1 true IE39093B1 (en) | 1978-08-02 |
Family
ID=5876880
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IE628/74A IE39093B1 (en) | 1973-04-03 | 1974-03-22 | 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) |
Families Citing this family (4)
| 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 |
| ATE527768T1 (en) * | 2008-10-17 | 2011-10-15 | 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 |
-
1974
- 1974-03-18 GB GB1188174A patent/GB1465923A/en not_active Expired
- 1974-03-22 IE IE628/74A patent/IE39093B1/en unknown
- 1974-03-26 IL IL44495A patent/IL44495A/en unknown
- 1974-03-28 CH CH437374A patent/CH576215A5/xx not_active IP Right Cessation
- 1974-03-28 FR FR7410820A patent/FR2224946B1/fr not_active Expired
- 1974-03-29 IT IT49876/74A patent/IT1011198B/en active
- 1974-04-01 AT AT270674A patent/AT333851B/en not_active IP Right Cessation
- 1974-04-01 AU AU67383/74A patent/AU484739B2/en not_active Expired
- 1974-04-02 DK DK182074A patent/DK137000C/en active
- 1974-04-02 SE SE7404424A patent/SE397035B/en unknown
- 1974-04-02 ZA ZA00742085A patent/ZA742085B/en unknown
- 1974-04-02 LU LU69773A patent/LU69773A1/xx unknown
- 1974-04-03 BE BE142803A patent/BE813245A/en unknown
- 1974-04-03 NL NL7404542.A patent/NL167069C/en active
Also Published As
| Publication number | Publication date |
|---|---|
| IL44495A (en) | 1977-01-31 |
| IE39093L (en) | 1974-10-03 |
| AT333851B (en) | 1976-12-10 |
| FR2224946A1 (en) | 1974-10-31 |
| CH576215A5 (en) | 1976-05-31 |
| DE2316647A1 (en) | 1974-10-17 |
| NL167069C (en) | 1981-10-15 |
| ZA742085B (en) | 1975-03-26 |
| IT1011198B (en) | 1977-01-20 |
| FR2224946B1 (en) | 1979-05-25 |
| LU69773A1 (en) | 1974-07-18 |
| BE813245A (en) | 1974-10-03 |
| NL7404542A (en) | 1974-10-07 |
| GB1465923A (en) | 1977-03-02 |
| IL44495A0 (en) | 1974-06-30 |
| DE2316647B2 (en) | 1975-10-30 |
| DK137000C (en) | 1978-05-29 |
| DK137000B (en) | 1977-12-27 |
| AU6738374A (en) | 1975-10-02 |
| AU484739B2 (en) | 1975-10-02 |
| ATA270674A (en) | 1976-04-15 |
| SE397035B (en) | 1977-10-10 |
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