JPS5526728A - Secret communication unit - Google Patents
Secret communication unitInfo
- Publication number
- JPS5526728A JPS5526728A JP9928078A JP9928078A JPS5526728A JP S5526728 A JPS5526728 A JP S5526728A JP 9928078 A JP9928078 A JP 9928078A JP 9928078 A JP9928078 A JP 9928078A JP S5526728 A JPS5526728 A JP S5526728A
- Authority
- JP
- Japan
- Prior art keywords
- secret
- sound signal
- signal
- period
- sound
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K1/00—Secret communication
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
Abstract
PURPOSE:To secure sufficiently secrecy by preventing a unit from getting out of synchronism due to a turnaround, by attaining synchronization by extracting synchronous information from an input secret signal. CONSTITUTION:The input period of a sound signal to be sent out is detected by sound detection circuit 8; only during the sound input period, analog switch 9a is turned ON to send out a secret sound signal with an additional synchronizing signal and in this transmission period, analog switch 9b is turned ON to stop the reception of the secret sound signal. In a period except the sound input period, switch 9a is OFF with switch 9b ON so as to receive the secret sound signal from other stations without sending the secret sound signal of its own out. Consequently, no turnaround of its own signal occurs in the reception of the secret sound signal and the excellent secret sound signal with its period stabilized can be restored.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9928078A JPS5526728A (en) | 1978-08-15 | 1978-08-15 | Secret communication unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9928078A JPS5526728A (en) | 1978-08-15 | 1978-08-15 | Secret communication unit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5526728A true JPS5526728A (en) | 1980-02-26 |
Family
ID=14243242
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9928078A Pending JPS5526728A (en) | 1978-08-15 | 1978-08-15 | Secret communication unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5526728A (en) |
-
1978
- 1978-08-15 JP JP9928078A patent/JPS5526728A/en active Pending
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