JPS57113646A - Signal concealing device - Google Patents
Signal concealing deviceInfo
- Publication number
- JPS57113646A JPS57113646A JP18623780A JP18623780A JPS57113646A JP S57113646 A JPS57113646 A JP S57113646A JP 18623780 A JP18623780 A JP 18623780A JP 18623780 A JP18623780 A JP 18623780A JP S57113646 A JPS57113646 A JP S57113646A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- signals
- picked
- hilbert
- filter
- 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
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/02—Analogue recording or reproducing
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Recording Or Reproducing By Magnetic Means (AREA)
Abstract
PURPOSE:To conceal signals with a simple hardware, by forming the primary coupling while giving phase difference to both components of the signal and distrubing noise. CONSTITUTION:A specified frequency band only is picked up from an audio signal picked up at a microphone 10 with an amplifer 11 and a filter 12 and the signal is introduced to the 1st Hilbert converter 17 via a variable gain amplifier 13. On the other hand, the disturbing noise is picked up via a filter 16 for the binary series obtained from a virtual random series generating circuit 15 and introduced to the 2nd Hilbert converter 18. Phase lead-side outputs S(t), N(t) and lag-side outputs S(t), N(t) are obtained from the Hilbert converters 17, 18, and addition of L(t)=S(t)+N(t), and R(t)=S(t)+N(t) is made at two adders 19, 20 to obtain the two signals L(t), R(t). Both the signals are outputted to a stereo signal carrier such as a tape recorder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18623780A JPS57113646A (en) | 1980-12-30 | 1980-12-30 | Signal concealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18623780A JPS57113646A (en) | 1980-12-30 | 1980-12-30 | Signal concealing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS57113646A true JPS57113646A (en) | 1982-07-15 |
Family
ID=16184749
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18623780A Pending JPS57113646A (en) | 1980-12-30 | 1980-12-30 | Signal concealing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57113646A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5394475A (en) * | 1991-11-13 | 1995-02-28 | Ribic; Zlatan | Method for shifting the frequency of signals |
| US5633937A (en) * | 1991-11-13 | 1997-05-27 | Viennatone Ag | Method for processing signals |
-
1980
- 1980-12-30 JP JP18623780A patent/JPS57113646A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5394475A (en) * | 1991-11-13 | 1995-02-28 | Ribic; Zlatan | Method for shifting the frequency of signals |
| US5633937A (en) * | 1991-11-13 | 1997-05-27 | Viennatone Ag | Method for processing signals |
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