JPS54129902A - Secret communication system - Google Patents
Secret communication systemInfo
- Publication number
- JPS54129902A JPS54129902A JP3774678A JP3774678A JPS54129902A JP S54129902 A JPS54129902 A JP S54129902A JP 3774678 A JP3774678 A JP 3774678A JP 3774678 A JP3774678 A JP 3774678A JP S54129902 A JPS54129902 A JP S54129902A
- Authority
- JP
- Japan
- Prior art keywords
- communication
- secret
- signal
- synchronizing signal
- sound signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
PURPOSE: To exercise high-articulation communication by preventing the mixture of an impulsive noise due to the turning around of a synchronizing signal after securing sufficiently the secret of communication by transmitting the synchronizing signal via a two-wire line such as a telephone circuit together with a sound signal made into secret-communication information.
CONSTITUTION: Telephone set 11 is connected to telephone circuit 14 via switch circuits 12 and 13 interlocking together, and secret-communication device 15 is separated into two systems, the transmission side and reception side, via circuits 12 and 13. At the transmission side, a sound signal from hybrid coil 17 is inputted to secret-communication processing circuit 18 and the signal received via hybrid coil 16 after the fixed secret-communication process is inputted to secret-communication reload circuit 19, where it is changed into the original signal. Consequently, the synchronizing signal is transmitted via the two-wire line such as a telephone circuit together with the sound signal made into secret-communication information, and the mixture of an impulsive noise, etc., due to the turning around of the synchronizing signal is prevented besides securing the secret of the communication, so that high-articulation communication can be fulfilled.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3774678A JPS54129902A (en) | 1978-03-31 | 1978-03-31 | Secret communication system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3774678A JPS54129902A (en) | 1978-03-31 | 1978-03-31 | Secret communication system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54129902A true JPS54129902A (en) | 1979-10-08 |
Family
ID=12506035
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3774678A Pending JPS54129902A (en) | 1978-03-31 | 1978-03-31 | Secret communication system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54129902A (en) |
-
1978
- 1978-03-31 JP JP3774678A patent/JPS54129902A/en active Pending
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS57107664A (en) | Electronic button telephone set | |
JPS54129902A (en) | Secret communication system | |
JPS5679552A (en) | Loop back system for duplex loop transmission system | |
JPS5279815A (en) | Transmitting and receiving circuit | |
JPS53138631A (en) | Still picture transmission system | |
JPS55110467A (en) | Facsimile communication system | |
JPS542612A (en) | Fault-protective circuit of signal transmitter | |
JPS5310917A (en) | Picture and sound transmission system | |
JPS5260518A (en) | Television system for voice communication | |
JPS5236907A (en) | Information transmission system | |
JPS55130266A (en) | Control system for attendant board | |
JPS5487425A (en) | Still-picture video telephone set | |
JPS5267905A (en) | Error control system | |
JPS5553764A (en) | Unmanned operation and remote mutual control system for computer | |
JPS5224417A (en) | Multi-channel reception tuner | |
JPS5222815A (en) | Receiver device which can request the transmission of standstill image | |
JPS5525224A (en) | Facsimile automatic repeating installation | |
JPS57171883A (en) | Video signal distributing and transmitting device | |
JPS5370711A (en) | Picture image transmitting system | |
JPS6447190A (en) | System for transmitting video scramble and transmitter-receiver thereof | |
JPS5225515A (en) | Side tone circuit for prestoke type transceiver | |
JPS536504A (en) | Distribution system for facsimile signal | |
JPS5521637A (en) | Multiplex transmission system for still picture | |
JPS523318A (en) | Howler circuit | |
JPS5252316A (en) | Terminal connection unit in two-way catv system |