JPS6430343A - Secret call communicating equipment - Google Patents
Secret call communicating equipmentInfo
- Publication number
- JPS6430343A JPS6430343A JP18737587A JP18737587A JPS6430343A JP S6430343 A JPS6430343 A JP S6430343A JP 18737587 A JP18737587 A JP 18737587A JP 18737587 A JP18737587 A JP 18737587A JP S6430343 A JPS6430343 A JP S6430343A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- pseudo
- spectra
- secret call
- constitution
- 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.)
- Granted
Links
Abstract
PURPOSE:To dispense with a filter group and to simplify a circuit constitution by selecting the one side of two single-sideband SSB signal spectra in a reflected image relation at a transmitting side corresponding to the code polarity of a pseudo-random signal and obtaining a secret call by means of the SSB signal in which a frequency relation is inverted. CONSTITUTION:At the transmitting side, by selecting, corresponding to the code polarity of the pseudo-random signal, the one side of the two SSG signal spectra in the reflected image relation, the secret call is obtained by the SSB signal in which the frequency relation is inverted, and at a receiving side, a prototype sound signal spectrum is restored by the pseudo-random signal in which a code synchronizing is established in a pilot signal. Thus, the filter group to conventionally increase a circuit scale can be made unnecessary, the circuit scale can be widely reduced and the circuit constitution can be made simple. Since the system is not one to divide the spectra, the problem of waveform deterioration does not exists, and the quality of a restoring voice can be improved.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18737587A JPS6430343A (en) | 1987-07-27 | 1987-07-27 | Secret call communicating equipment |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18737587A JPS6430343A (en) | 1987-07-27 | 1987-07-27 | Secret call communicating equipment |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6430343A true JPS6430343A (en) | 1989-02-01 |
JPH0529176B2 JPH0529176B2 (en) | 1993-04-28 |
Family
ID=16204909
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP18737587A Granted JPS6430343A (en) | 1987-07-27 | 1987-07-27 | Secret call communicating equipment |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6430343A (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6143032A (en) * | 1984-08-06 | 1986-03-01 | Yaesu Musen Co Ltd | Privacy telephone set |
JPS61198839A (en) * | 1985-02-27 | 1986-09-03 | Fujitsu Ltd | Privacy call system |
-
1987
- 1987-07-27 JP JP18737587A patent/JPS6430343A/en active Granted
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6143032A (en) * | 1984-08-06 | 1986-03-01 | Yaesu Musen Co Ltd | Privacy telephone set |
JPS61198839A (en) * | 1985-02-27 | 1986-09-03 | Fujitsu Ltd | Privacy call system |
Also Published As
Publication number | Publication date |
---|---|
JPH0529176B2 (en) | 1993-04-28 |
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