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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 systems

Info

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
Application number
CS19871778A
Other languages
Czech (cs)
Inventor
Miloš Ing. Csc. Andrle
Original Assignee
Ministerstvo Vnitra Čr
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 Ministerstvo Vnitra Čr filed Critical Ministerstvo Vnitra Čr
Priority to CS19871778A priority Critical patent/CZ295702B6/en
Publication of CZ295702B6 publication Critical patent/CZ295702B6/en

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.
CS19871778A 1987-03-16 1987-03-16 Circuit arrangement for concealed transmission of speech signals in digital communication systems CZ295702B6 (en)

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)

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Legal Events

Date Code Title Description
MK4A Expiration of patent

Effective date: 20070316