JPS5530282A - Communication system - Google Patents
Communication systemInfo
- Publication number
- JPS5530282A JPS5530282A JP10420978A JP10420978A JPS5530282A JP S5530282 A JPS5530282 A JP S5530282A JP 10420978 A JP10420978 A JP 10420978A JP 10420978 A JP10420978 A JP 10420978A JP S5530282 A JPS5530282 A JP S5530282A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- carrier
- invariably
- transitions
- repeating
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K1/00—Secret communication
- H04K1/003—Secret communication by varying carrier frequency at or within predetermined or random intervals
Abstract
PURPOSE:To improve secrecy of communication on a communication system where a carrier frequency varies invariably, by generating a carrier by repeating an infinite period which depends upon selections of transitions of several frequencies. CONSTITUTION:The high-frequency amplifier output frequency (fA) repeating an infinite period which depends upon the selection of the transitions of several frequencies. When the frequency changes, chirp-wave detecting electrodes 4, 5 and 6 generates their outputs. When pulses generated by detecting electrodes 4, 5 and 6 agree with the sequence of controller 8, detector 7 drives sequence generator 9 to generate signal (fB) with frequency transition via surface-wave compressor 2 and delay element 10 of the same constitution. Signals (fA) and (fB) are mixed together and then detected by way of mixer 16 and amplifier 18. Since the carrier frequency varies invariably, its secrecy is high and more communication circuits can be used.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP53104209A JPS6036144B2 (en) | 1978-08-25 | 1978-08-25 | Communication method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP53104209A JPS6036144B2 (en) | 1978-08-25 | 1978-08-25 | Communication method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5530282A true JPS5530282A (en) | 1980-03-04 |
JPS6036144B2 JPS6036144B2 (en) | 1985-08-19 |
Family
ID=14374569
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP53104209A Expired JPS6036144B2 (en) | 1978-08-25 | 1978-08-25 | Communication method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6036144B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6333938A (en) * | 1986-07-28 | 1988-02-13 | Kyocera Corp | Spread spectrum system |
JPH02172338A (en) * | 1988-12-26 | 1990-07-03 | G D S:Kk | Continuous chirp modulation system spread spectrum communication equipment |
-
1978
- 1978-08-25 JP JP53104209A patent/JPS6036144B2/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6333938A (en) * | 1986-07-28 | 1988-02-13 | Kyocera Corp | Spread spectrum system |
JPH02172338A (en) * | 1988-12-26 | 1990-07-03 | G D S:Kk | Continuous chirp modulation system spread spectrum communication equipment |
Also Published As
Publication number | Publication date |
---|---|
JPS6036144B2 (en) | 1985-08-19 |
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