NL51914C - - Google Patents
Info
- Publication number
- NL51914C NL51914C NL88488A NL88488A NL51914C NL 51914 C NL51914 C NL 51914C NL 88488 A NL88488 A NL 88488A NL 88488 A NL88488 A NL 88488A NL 51914 C NL51914 C NL 51914C
- Authority
- NL
- Netherlands
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/52—Circuit arrangements for protecting such amplifiers
- H03F1/54—Circuit arrangements for protecting such amplifiers with tubes only
-
- 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)
- Power Engineering (AREA)
- Transmitters (AREA)
- Mobile Radio Communication Systems (AREA)
- Ac-Ac Conversion (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US149815A US2132205A (en) | 1937-06-23 | 1937-06-23 | Secret transmission |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL51914C true NL51914C (en:Method) | 1942-02-16 |
Family
ID=22531907
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL88488A NL51914C (en:Method) | 1937-06-23 | 1938-06-22 |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US2132205A (en:Method) |
| CH (1) | CH208091A (en:Method) |
| DE (1) | DE889905C (en:Method) |
| FR (1) | FR839636A (en:Method) |
| GB (1) | GB504861A (en:Method) |
| NL (1) | NL51914C (en:Method) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE445078A (en:Method) * | 1941-04-03 | |||
| US2958827A (en) * | 1943-09-02 | 1960-11-01 | Warren A Anderson | Electrical cancellation and indicating system |
| US3105114A (en) * | 1944-04-12 | 1963-09-24 | Bell Telephone Labor Inc | Signaling system |
| US3470323A (en) * | 1944-06-30 | 1969-09-30 | Bell Telephone Labor Inc | Signaling system |
| US3979558A (en) * | 1944-06-30 | 1976-09-07 | Bell Telephone Laboratories, Incorporated | Signaling system |
| CH248975A (de) * | 1946-02-04 | 1947-05-31 | Patelhold Patentverwertung | Verfahren und Einrichtung zur Verschleierung der einzelnen Gespräche einer Mehrkanalanlage. |
| USRE34004E (en) * | 1953-03-30 | 1992-07-21 | Itt Corporation | Secure single sideband communication system using modulated noise subcarrier |
| US2909596A (en) * | 1954-04-07 | 1959-10-20 | Teletrak Corp | Apparatus for magnetically recording electrical waves |
| US3777064A (en) * | 1972-06-01 | 1973-12-04 | Us Navy | Voice privacy system |
| US4020285A (en) * | 1972-09-29 | 1977-04-26 | Datotek, Inc. | Voice security method and system |
| US4278840A (en) * | 1979-03-23 | 1981-07-14 | Datotek, Inc. | Dynamic frequency and time voice encryption system and method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL16701C (en:Method) * | 1923-06-30 | |||
| NL24066C (en:Method) * | 1927-08-05 |
-
1937
- 1937-06-23 US US149815A patent/US2132205A/en not_active Expired - Lifetime
-
1938
- 1938-05-10 GB GB13947/38A patent/GB504861A/en not_active Expired
- 1938-06-17 DE DEW3472D patent/DE889905C/de not_active Expired
- 1938-06-21 CH CH208091D patent/CH208091A/de unknown
- 1938-06-22 FR FR839636D patent/FR839636A/fr not_active Expired
- 1938-06-22 NL NL88488A patent/NL51914C/xx active
Also Published As
| Publication number | Publication date |
|---|---|
| DE889905C (de) | 1953-09-14 |
| US2132205A (en) | 1938-10-04 |
| GB504861A (en) | 1939-05-02 |
| CH208091A (de) | 1939-12-31 |
| FR839636A (fr) | 1939-04-07 |