JPS5556743A - Simple privacy telephone set - Google Patents

Simple privacy telephone set

Info

Publication number
JPS5556743A
JPS5556743A JP12984978A JP12984978A JPS5556743A JP S5556743 A JPS5556743 A JP S5556743A JP 12984978 A JP12984978 A JP 12984978A JP 12984978 A JP12984978 A JP 12984978A JP S5556743 A JPS5556743 A JP S5556743A
Authority
JP
Japan
Prior art keywords
aural
signal
reversed
balanced
component
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
Application number
JP12984978A
Other languages
Japanese (ja)
Inventor
Akikazu Shibata
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to JP12984978A priority Critical patent/JPS5556743A/en
Publication of JPS5556743A publication Critical patent/JPS5556743A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K1/00—Secret communication
    • H04K1/04—Secret communication by frequency scrambling, i.e. by transposing or inverting parts of the frequency band or by inverting the whole band

Abstract

PURPOSE:To realize the privacy communication with a simple constitution by giving FM and transmission after forming the signal the aural frequency component of which is reversed centering on the reference frequency via the balanced modulator and then supplying the speaker terminal output through the input switch at the reception side to demodulate it to the normal signal. CONSTITUTION:The aural input signal receives preamplification 3 and then balanced modulation 5 with the oscillation frequency of 1st local oscillator 4. And only the upper side band component is extracted from the output through BPF6 to be sent to balanced modulator 7. Modulator 7 gives the balanced modulation to the oscillation frequency of 2nd local oscillator 8 and the aural component of the upper side band sent from BPF6 to produce the signal the aural frequency component is reversed into the upper and lower sides centering on 1.5kHz. And this reversed signal is transmitted through FM or the like. At the reception side the reversed aural signal obtained through receiver 16 is extracted through speaker terminal 12 and then supplied from switch 2 after the level adjustment through attenuator 13 to be demodulated to the normal aural signal by balanced modulation 7. In such way, the privacy communication is possible with a small-size and simple constitution.
JP12984978A 1978-10-20 1978-10-20 Simple privacy telephone set Pending JPS5556743A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12984978A JPS5556743A (en) 1978-10-20 1978-10-20 Simple privacy telephone set

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12984978A JPS5556743A (en) 1978-10-20 1978-10-20 Simple privacy telephone set

Publications (1)

Publication Number Publication Date
JPS5556743A true JPS5556743A (en) 1980-04-25

Family

ID=15019755

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12984978A Pending JPS5556743A (en) 1978-10-20 1978-10-20 Simple privacy telephone set

Country Status (1)

Country Link
JP (1) JPS5556743A (en)

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