BE455172A - - Google Patents
Info
- Publication number
- BE455172A BE455172A BE455172DA BE455172A BE 455172 A BE455172 A BE 455172A BE 455172D A BE455172D A BE 455172DA BE 455172 A BE455172 A BE 455172A
- Authority
- BE
- Belgium
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)
- Complex Calculations (AREA)
- Mobile Radio Communication Systems (AREA)
- Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH582737X | 1943-04-05 |
Publications (1)
Publication Number | Publication Date |
---|---|
BE455172A true BE455172A (en) |
Family
ID=4521608
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
BE455172D BE455172A (en) | 1943-04-05 |
Country Status (6)
Country | Link |
---|---|
US (1) | US2411206A (en) |
BE (1) | BE455172A (en) |
CH (1) | CH238926A (en) |
FR (1) | FR902917A (en) |
GB (1) | GB582737A (en) |
NL (1) | NL63459C (en) |
Families Citing this family (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3124748A (en) * | 1964-03-10 | Secret signalling systems | ||
CH246844A (en) * | 1945-09-15 | 1947-01-31 | Patelhold Patentverwertung | Method and device for obfuscating electrically transmitted voice messages. |
BE473802A (en) * | 1946-08-20 | |||
US2535442A (en) * | 1949-07-26 | 1950-12-26 | James L A Mclaughlin | Heterodyne eliminator communication system |
US2766325A (en) * | 1951-09-01 | 1956-10-09 | Itt | Narrow band communication system |
DE1062750B (en) * | 1957-09-27 | 1959-08-06 | Standard Elektrik Lorenz Ag | Arrangement for switching over voice inverters in communication systems |
DE1181749B (en) * | 1960-03-31 | 1964-11-19 | Siemens Ag | Method for message encryption |
DE1196713B (en) * | 1962-08-30 | 1965-07-15 | Deutsche Bundespost | Procedure for voice encryption |
US4068094A (en) * | 1973-02-13 | 1978-01-10 | Gretag Aktiengesellschaft | Method and apparatus for the scrambled transmission of spoken information via a telephony channel |
CH559483A5 (en) * | 1973-06-12 | 1975-02-28 | Patelhold Patentverwertung | |
CH580893A5 (en) * | 1973-07-02 | 1976-10-15 | Gretag Ag | |
US4058677A (en) * | 1974-04-26 | 1977-11-15 | Lear Siegler, Inc. | Sound scrambling equipment |
CH578807A5 (en) * | 1974-11-05 | 1976-08-13 | Patelhold Patentverwertung | |
DE2523828C2 (en) * | 1975-05-30 | 1982-08-12 | TE KA DE Felten & Guilleaume Fernmeldeanlagen GmbH, 8500 Nürnberg | Method for obfuscating speech signals with the aid of orthogonal matrices |
DE2750240C3 (en) * | 1977-11-10 | 1981-03-26 | Felten & Guilleaume Fernmeldeanlagen GmbH, 8500 Nürnberg | Process for improving the reproduction quality of speech in encryption processes |
US4156107A (en) * | 1978-02-03 | 1979-05-22 | Bell Telephone Laboratories, Incorporated | Speech signal scrambler |
US4443660A (en) * | 1980-02-04 | 1984-04-17 | Rockwell International Corporation | System and method for encrypting a voice signal |
US4591673A (en) * | 1982-05-10 | 1986-05-27 | Lee Lin Shan | Frequency or time domain speech scrambling technique and system which does not require any frame synchronization |
US5949878A (en) * | 1996-06-28 | 1999-09-07 | Transcrypt International, Inc. | Method and apparatus for providing voice privacy in electronic communication systems |
-
0
- BE BE455172D patent/BE455172A/xx unknown
- NL NL63459D patent/NL63459C/xx active
-
1943
- 1943-04-05 CH CH238926D patent/CH238926A/en unknown
-
1944
- 1944-03-24 FR FR902917D patent/FR902917A/en not_active Expired
- 1944-04-05 GB GB6377/44A patent/GB582737A/en not_active Expired
- 1944-05-19 US US536233A patent/US2411206A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
GB582737A (en) | 1946-11-26 |
NL63459C (en) | |
FR902917A (en) | 1945-09-17 |
CH238926A (en) | 1945-08-31 |
US2411206A (en) | 1946-11-19 |