JPS6430343A - Secret call communicating equipment - Google Patents

Secret call communicating equipment

Info

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
Application number
JP18737587A
Other languages
Japanese (ja)
Other versions
JPH0529176B2 (en
Inventor
Osamu Ichiyoshi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Priority to JP18737587A priority Critical patent/JPS6430343A/en
Publication of JPS6430343A publication Critical patent/JPS6430343A/en
Publication of JPH0529176B2 publication Critical patent/JPH0529176B2/ja
Granted legal-status Critical Current

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.
JP18737587A 1987-07-27 1987-07-27 Secret call communicating equipment Granted JPS6430343A (en)

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)

* Cited by examiner, † Cited by third party
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

Patent Citations (2)

* Cited by examiner, † Cited by third party
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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