ZA773157B - Method and apparatus for enciphering and deciphering audio information - Google Patents
Method and apparatus for enciphering and deciphering audio informationInfo
- Publication number
- ZA773157B ZA773157B ZA00773157A ZA773157A ZA773157B ZA 773157 B ZA773157 B ZA 773157B ZA 00773157 A ZA00773157 A ZA 00773157A ZA 773157 A ZA773157 A ZA 773157A ZA 773157 B ZA773157 B ZA 773157B
- Authority
- ZA
- South Africa
- Prior art keywords
- enciphering
- audio information
- deciphering
- deciphering audio
- information
- 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)
- Reverberation, Karaoke And Other Acoustics (AREA)
- Mobile Radio Communication Systems (AREA)
- Storage Device Security (AREA)
- Electrophonic Musical Instruments (AREA)
- Financial Or Insurance-Related Operations Such As Payment And Settlement (AREA)
- Document Processing Apparatus (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH689376A CH607506A5 (US06582424-20030624-M00016.png) | 1976-06-01 | 1976-06-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| ZA773157B true ZA773157B (en) | 1979-01-31 |
Family
ID=4316707
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ZA00773157A ZA773157B (en) | 1976-06-01 | 1977-05-25 | Method and apparatus for enciphering and deciphering audio information |
Country Status (19)
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4221931A (en) * | 1977-10-17 | 1980-09-09 | Harris Corporation | Time division multiplied speech scrambler |
| US4232194A (en) * | 1979-03-16 | 1980-11-04 | Ocean Technology, Inc. | Voice encryption system |
| US4278840A (en) * | 1979-03-23 | 1981-07-14 | Datotek, Inc. | Dynamic frequency and time voice encryption system and method |
| US4443660A (en) * | 1980-02-04 | 1984-04-17 | Rockwell International Corporation | System and method for encrypting a voice signal |
| DE3138523A1 (de) * | 1981-09-28 | 1983-04-07 | Siemens AG, 1000 Berlin und 8000 München | Verfahren zur abhoersicheren frequenzbandkomprimierten uebertragung von sprachsignalen |
| US4433211A (en) * | 1981-11-04 | 1984-02-21 | Technical Communications Corporation | Privacy communication system employing time/frequency transformation |
| 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 |
| US4551580A (en) * | 1982-11-22 | 1985-11-05 | At&T Bell Laboratories | Time-frequency scrambler |
| US4763357A (en) * | 1985-04-18 | 1988-08-09 | Barr William S | Method and apparatus for providing secure electronic communications |
| GB2182229B (en) * | 1985-10-25 | 1989-10-04 | Racal Res Ltd | Speech scramblers |
| US4893339A (en) * | 1986-09-03 | 1990-01-09 | Motorola, Inc. | Secure communication system |
| EP0313029A1 (de) * | 1987-10-21 | 1989-04-26 | Siemens Aktiengesellschaft Österreich | Vorrichtung zur verschleierten Übertragung analoger Signale |
| US6061449A (en) * | 1997-10-10 | 2000-05-09 | General Instrument Corporation | Secure processor with external memory using block chaining and block re-ordering |
| DE602005009439D1 (de) * | 2004-07-06 | 2008-10-16 | Proton World Int Nv | Stromverschlüsselung des Inhalts eines Speichers, welcher ausserhalb eines Prozessors angeordnet ist |
| EP1615369A1 (fr) * | 2004-07-06 | 2006-01-11 | Proton World International N.V. | Chiffrement par blocs du contenu d'une mémoire externe à un processeur |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH248975A (de) * | 1946-02-04 | 1947-05-31 | Patelhold Patentverwertung | Verfahren und Einrichtung zur Verschleierung der einzelnen Gespräche einer Mehrkanalanlage. |
| DE2021941A1 (de) * | 1969-05-14 | 1972-01-13 | Philips Nv | UEbertragungssystem zur verschluesselten UEbertragung von Tonfrequenz-Informationssignalen |
| CH518658A (de) * | 1970-07-07 | 1972-01-31 | Patelhold Patentverwaltungs Un | Verfahren zur verschlüsselten Nachrichtenübermittlung durch zeitliche Vertauschung von Informationselementen |
| US3921151A (en) * | 1971-06-21 | 1975-11-18 | Patelhold Patentwerwertungs & | Apparatus for enciphering transmitted data by interchanging signal elements of the transmitted data without overlapping or omitting any elements within the transmitted signal train |
| US3798360A (en) * | 1971-06-30 | 1974-03-19 | Ibm | Step code ciphering system |
| US3991271A (en) * | 1972-09-29 | 1976-11-09 | Datotek, Inc. | Voice security method and system |
-
1976
- 1976-06-01 CH CH689376A patent/CH607506A5/xx not_active IP Right Cessation
-
1977
- 1977-05-09 NL NL7705062A patent/NL7705062A/xx not_active Application Discontinuation
- 1977-05-11 AR AR267569A patent/AR216465A1/es active
- 1977-05-13 BE BE177571A patent/BE854626A/xx not_active IP Right Cessation
- 1977-05-16 AT AT0350977A patent/AT363129B/de not_active IP Right Cessation
- 1977-05-17 IT IT23670/77A patent/IT1118027B/it active
- 1977-05-17 ES ES458856A patent/ES458856A1/es not_active Expired
- 1977-05-25 GB GB22007/77A patent/GB1567868A/en not_active Expired
- 1977-05-25 ZA ZA00773157A patent/ZA773157B/xx unknown
- 1977-05-26 FR FR7716116A patent/FR2354005A1/fr active Granted
- 1977-05-26 DE DE2723804A patent/DE2723804C2/de not_active Expired
- 1977-05-26 SE SE7706207A patent/SE416604B/xx not_active IP Right Cessation
- 1977-05-26 JP JP6053577A patent/JPS534401A/ja active Pending
- 1977-05-27 CA CA279,291A patent/CA1092195A/en not_active Expired
- 1977-05-31 DK DK239177A patent/DK239177A/da not_active Application Discontinuation
- 1977-05-31 NO NO771908A patent/NO144722C/no unknown
- 1977-05-31 BR BR7703539A patent/BR7703539A/pt unknown
- 1977-06-01 US US05/802,427 patent/US4149035A/en not_active Expired - Lifetime
- 1977-06-01 FI FI771737A patent/FI771737A/fi not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| FI771737A (US06582424-20030624-M00016.png) | 1977-12-02 |
| ES458856A1 (es) | 1978-03-16 |
| FR2354005A1 (fr) | 1977-12-30 |
| SE7706207L (sv) | 1977-12-02 |
| NL7705062A (nl) | 1977-12-05 |
| NO144722B (no) | 1981-07-13 |
| DE2723804C2 (de) | 1986-02-27 |
| GB1567868A (en) | 1980-05-21 |
| SE416604B (sv) | 1981-01-19 |
| ATA350977A (de) | 1980-12-15 |
| NO144722C (no) | 1981-10-21 |
| BR7703539A (pt) | 1978-03-14 |
| DK239177A (da) | 1977-12-02 |
| CH607506A5 (US06582424-20030624-M00016.png) | 1978-12-29 |
| BE854626A (fr) | 1977-11-14 |
| JPS534401A (en) | 1978-01-17 |
| NO771908L (no) | 1977-12-02 |
| CA1092195A (en) | 1980-12-23 |
| IT1118027B (it) | 1986-02-24 |
| DE2723804A1 (de) | 1977-12-15 |
| AR216465A1 (es) | 1979-12-28 |
| US4149035A (en) | 1979-04-10 |
| FR2354005B3 (US06582424-20030624-M00016.png) | 1980-04-04 |
| AT363129B (de) | 1981-07-10 |
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