NL63459C - - Google Patents
Info
- Publication number
- NL63459C NL63459C NL63459DA NL63459C NL 63459 C NL63459 C NL 63459C NL 63459D A NL63459D A NL 63459DA NL 63459 C NL63459 C NL 63459C
- Authority
- NL
- Netherlands
- Prior art keywords
- band
- bands
- inverted
- speech
- give
- 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)
- Complex Calculations (AREA)
- Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
- Mobile Radio Communication Systems (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH582737X | 1943-04-05 |
Publications (1)
Publication Number | Publication Date |
---|---|
NL63459C true NL63459C (no) |
Family
ID=4521608
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NL63459D NL63459C (no) | 1943-04-05 |
Country Status (6)
Country | Link |
---|---|
US (1) | US2411206A (no) |
BE (1) | BE455172A (no) |
CH (1) | CH238926A (no) |
FR (1) | FR902917A (no) |
GB (1) | GB582737A (no) |
NL (1) | NL63459C (no) |
Families Citing this family (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3124748A (en) * | 1964-03-10 | Secret signalling systems | ||
CH246844A (de) * | 1945-09-15 | 1947-01-31 | Patelhold Patentverwertung | Verfahren und Einrichtung zur Verschleierung von elektrisch übermittelten Sprachnachrichten. |
BE473802A (no) * | 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 (de) * | 1957-09-27 | 1959-08-06 | Standard Elektrik Lorenz Ag | Anordnung zur Umschaltung von Sprachinvertern in Nachrichtenuebertragungsanlagen |
DE1181749B (de) * | 1960-03-31 | 1964-11-19 | Siemens Ag | Verfahren zur Nachrichtenverschluesselung |
DE1196713B (de) * | 1962-08-30 | 1965-07-15 | Deutsche Bundespost | Verfahren zur Sprachverschluesselung |
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 (no) * | 1973-06-12 | 1975-02-28 | Patelhold Patentverwertung | |
CH580893A5 (no) * | 1973-07-02 | 1976-10-15 | Gretag Ag | |
US4058677A (en) * | 1974-04-26 | 1977-11-15 | Lear Siegler, Inc. | Sound scrambling equipment |
CH578807A5 (no) * | 1974-11-05 | 1976-08-13 | Patelhold Patentverwertung | |
DE2523828C2 (de) * | 1975-05-30 | 1982-08-12 | TE KA DE Felten & Guilleaume Fernmeldeanlagen GmbH, 8500 Nürnberg | Verfahren zur Verschleierung von Sprachsignalen mit Hilfe orthogonaler Matrizen |
DE2750240C3 (de) * | 1977-11-10 | 1981-03-26 | Felten & Guilleaume Fernmeldeanlagen GmbH, 8500 Nürnberg | Verfahren zur Verbesserung der Wiedergabequalität von Sprache bei Verschlüsselungsverfahren |
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/de unknown
-
1944
- 1944-03-24 FR FR902917D patent/FR902917A/fr 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 |
---|---|
CH238926A (de) | 1945-08-31 |
FR902917A (fr) | 1945-09-17 |
BE455172A (no) | |
GB582737A (en) | 1946-11-26 |
US2411206A (en) | 1946-11-19 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
NL63459C (no) | ||
ES309308A1 (es) | Perfeccionamientos en o relativos a los circuitos electricos para uso en sistemas de senalizacion | |
GB725915A (en) | Communication system | |
GB550912A (en) | Reduction of cross-talk | |
US1662876A (en) | Assigitoe | |
GB595885A (en) | Multichannel carrier transmission system | |
GB1091278A (en) | Improvements in or relating to multi-channel single-sideband carrier-frequency communication systems | |
US1836129A (en) | Signaling system | |
GB303180A (en) | Improvements in filter circuit arrangements comprising piezo crystals | |
IE38356B1 (en) | Frequency multiplex apparatus | |
GB570488A (en) | Improvements in systems for the secret electrical transmission of speech | |
GB371845A (en) | Means for securing the secrecy of electrically transmitted intelligence, signals and the like | |
JPS57113655A (en) | Signal encryption device | |
JPS5612146A (en) | Carrier communication system | |
GB632778A (en) | Improvements in telephonic transmission systems using multiple channel carrier currents | |
JPS53107258A (en) | Frequency split filter | |
GB1284318A (en) | A device for forming a multi-channel primary group for a carrier frequency transmission system | |
GB629861A (en) | Improvements in electric wave transmission systems | |
GB613877A (en) | Improvements in or relating to arrangements for the transmission of electric signalsoccupying a wide frequency band | |
GB986425A (en) | Improvements relating to carrier frequency communication apparatus | |
GB773687A (en) | Improvements in audio-frequency signalling arrangements in multiplex carrier wave telephone systems | |
GB1112857A (en) | Arrangement to receive individual channels out of a multichannel carrier frequency band | |
FR2351548A1 (fr) | Systeme de multiplexage de voies telephoniques pour la formation d'un groupe primaire | |
GB1136136A (en) | Multi-channel single-sideband carrier frequency system | |
JPS56122538A (en) | Existing and auxiliary system of communication equipment |