CZ295702B6 - Circuit arrangement for concealed transmission of speech signals in digital communication systems - Google Patents
Circuit arrangement for concealed transmission of speech signals in digital communication systemsInfo
- Publication number
- CZ295702B6 CZ295702B6 CS19871778A CS177887A CZ295702B6 CZ 295702 B6 CZ295702 B6 CZ 295702B6 CS 19871778 A CS19871778 A CS 19871778A CS 177887 A CS177887 A CS 177887A CZ 295702 B6 CZ295702 B6 CZ 295702B6
- Authority
- CZ
- Czechia
- Prior art keywords
- circuit arrangement
- communication systems
- speech signals
- signal
- digital communication
- Prior art date
Links
Landscapes
- Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
- Analogue/Digital Conversion (AREA)
Abstract
In the present invention, there is disclosed a circuit arrangement for concealed transmission of speech signals in digital communication systems wherein the invented circuit arrangement is characterized in that on the transmission side a speech signal is applied to a bandpass filter and further to an adaptive delta modulator in encryption mode of operation, which converts the analog signal to a digital form thereof. Further, a special combination circuit carries out rearrangement of individual bits. The output digital signal is then applied to a transmission system modem. From the output of this digital system, the signal is applied to a second combination circuit, which carries out restoration of the correct data structure.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CS19871778A CZ295702B6 (en) | 1987-03-16 | 1987-03-16 | Circuit arrangement for concealed transmission of speech signals in digital communication systems |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CS19871778A CZ295702B6 (en) | 1987-03-16 | 1987-03-16 | Circuit arrangement for concealed transmission of speech signals in digital communication systems |
Publications (1)
Publication Number | Publication Date |
---|---|
CZ295702B6 true CZ295702B6 (en) | 2005-09-14 |
Family
ID=34894646
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CS19871778A CZ295702B6 (en) | 1987-03-16 | 1987-03-16 | Circuit arrangement for concealed transmission of speech signals in digital communication systems |
Country Status (1)
Country | Link |
---|---|
CZ (1) | CZ295702B6 (en) |
-
1987
- 1987-03-16 CZ CS19871778A patent/CZ295702B6/en not_active IP Right Cessation
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
MK4A | Expiration of patent |
Effective date: 20070316 |