JPS57113655A - Signal encryption device - Google Patents
Signal encryption deviceInfo
- Publication number
- JPS57113655A JPS57113655A JP18623880A JP18623880A JPS57113655A JP S57113655 A JPS57113655 A JP S57113655A JP 18623880 A JP18623880 A JP 18623880A JP 18623880 A JP18623880 A JP 18623880A JP S57113655 A JPS57113655 A JP S57113655A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- delay
- given
- mainly
- filter bank
- 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
- H04K1/06—Secret communication by transmitting the information or elements thereof at unnatural speeds or in jumbled order or backwards
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
Abstract
PURPOSE:To achieve encryption of signal, by splitting an audio signal into a plurality of frequency bands and giving different delay to each band. CONSTITUTION:An audio signal from a microphone 1 is given to a tapped delay line 4 via a band pass filter 2 and an amplifier 3, and a split signal with different delay amount is prepared from each tap. The assignment of delay amount is determined to each input of each channel filter bank 6 succeeding to the next stage with a labyrinth (replacement) circuit 5 being a key. The output of the channel filter bank 6 is synthesized into one signal at an addition amplifier 7 and given on a signal carrier. To completely lose understanding, the delay time of frequency band occupied with consonants mainly and the delay time of the frequency band occupied mainly with vowels are separated by several hundred msec.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18623880A JPS57113655A (en) | 1980-12-30 | 1980-12-30 | Signal encryption device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18623880A JPS57113655A (en) | 1980-12-30 | 1980-12-30 | Signal encryption device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57113655A true JPS57113655A (en) | 1982-07-15 |
Family
ID=16184764
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP18623880A Pending JPS57113655A (en) | 1980-12-30 | 1980-12-30 | Signal encryption device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57113655A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4525844A (en) * | 1981-05-22 | 1985-06-25 | Licentia Patent-Verwaltungs-Gmbh | Method for interchanging n partial bands |
JP2020514819A (en) * | 2017-03-15 | 2020-05-21 | ガーディアン・グラス・エルエルシーGuardian Glass, Llc | Speech privacy system and / or related methods |
JP2020515887A (en) * | 2017-03-15 | 2020-05-28 | ガーディアン・グラス・エルエルシーGuardian Glass, Llc | Speech privacy system and/or related methods |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5039401A (en) * | 1973-07-02 | 1975-04-11 |
-
1980
- 1980-12-30 JP JP18623880A patent/JPS57113655A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5039401A (en) * | 1973-07-02 | 1975-04-11 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4525844A (en) * | 1981-05-22 | 1985-06-25 | Licentia Patent-Verwaltungs-Gmbh | Method for interchanging n partial bands |
JP2020514819A (en) * | 2017-03-15 | 2020-05-21 | ガーディアン・グラス・エルエルシーGuardian Glass, Llc | Speech privacy system and / or related methods |
JP2020515887A (en) * | 2017-03-15 | 2020-05-28 | ガーディアン・グラス・エルエルシーGuardian Glass, Llc | Speech privacy system and/or related methods |
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