FR2379948A1 - SPEECH CODING PROCESS FOLLOWING THE TEMPORARY JAMMING PROCEDURE - Google Patents

SPEECH CODING PROCESS FOLLOWING THE TEMPORARY JAMMING PROCEDURE

Info

Publication number
FR2379948A1
FR2379948A1 FR7803160A FR7803160A FR2379948A1 FR 2379948 A1 FR2379948 A1 FR 2379948A1 FR 7803160 A FR7803160 A FR 7803160A FR 7803160 A FR7803160 A FR 7803160A FR 2379948 A1 FR2379948 A1 FR 2379948A1
Authority
FR
France
Prior art keywords
code
signal
speech segments
coding process
speech coding
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.)
Withdrawn
Application number
FR7803160A
Other languages
French (fr)
Inventor
Jorg Robra
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.)
Tekade Felten and Guilleaume Fernmeldeanlagen GmbH
Original Assignee
Tekade Felten and Guilleaume Fernmeldeanlagen GmbH
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 Tekade Felten and Guilleaume Fernmeldeanlagen GmbH filed Critical Tekade Felten and Guilleaume Fernmeldeanlagen GmbH
Publication of FR2379948A1 publication Critical patent/FR2379948A1/en
Withdrawn legal-status Critical Current

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

Abstract

For speech encryption, clear signals (K1) in the form of speech segments of equal duration are permuted in a transmitter-side code modulator (SM), using code signals (S1) from a code generator (SG1). In a receiver-side demodulator (RM), the speech segments of the encrypted signal (VS) are permuted back into the clear signal (K2), using code signals (S2) from another code generator (SG2). To make unauthorised and systematic demodulation difficult, speech segments which are successive in the clear signal (K1) are not allowed to be successive in the encrypted signal (VS). At the same time, encryption is carried out so that all permutations appear equally often in the encrypted signal (VS). This makes the work of decryption for an unauthorised third party all the more difficult. This method is broken into steps so that it can be implemented with simple digital components.
FR7803160A 1977-02-05 1978-02-03 SPEECH CODING PROCESS FOLLOWING THE TEMPORARY JAMMING PROCEDURE Withdrawn FR2379948A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2704822A DE2704822C3 (en) 1977-02-05 1977-02-05 Method for voice encryption according to the time scrambling method

Publications (1)

Publication Number Publication Date
FR2379948A1 true FR2379948A1 (en) 1978-09-01

Family

ID=6000430

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7803160A Withdrawn FR2379948A1 (en) 1977-02-05 1978-02-03 SPEECH CODING PROCESS FOLLOWING THE TEMPORARY JAMMING PROCEDURE

Country Status (7)

Country Link
AT (1) AT375230B (en)
CH (1) CH628761A5 (en)
DE (1) DE2704822C3 (en)
DK (1) DK52378A (en)
FR (1) FR2379948A1 (en)
NL (1) NL7801250A (en)
SE (1) SE418442B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2455477C3 (en) * 1974-11-23 1982-08-26 TE KA DE Felten & Guilleaume Fernmeldeanlagen GmbH, 8500 Nürnberg Method for concealing speech by interchanging the speech segments over time
US4956709A (en) * 1988-03-11 1990-09-11 Pbs Enterprises, Inc. Forward error correction of data transmitted via television signals

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2455477A1 (en) * 1974-11-23 1976-05-26 Tekade Felten & Guilleaume PROCEDURE FOR LANGUAGE DISCOVERY BY TEMPORARILY SWAPPING THE SPEECH SECTIONS

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2455477A1 (en) * 1974-11-23 1976-05-26 Tekade Felten & Guilleaume PROCEDURE FOR LANGUAGE DISCOVERY BY TEMPORARILY SWAPPING THE SPEECH SECTIONS
FR2292386A1 (en) * 1974-11-23 1976-06-18 Tekade Felten & Guilleaume SPEECH SAVING PROCESS BY TIME EXCHANGE OF SPEECH SECTIONS

Also Published As

Publication number Publication date
AT375230B (en) 1984-07-10
DE2704822B2 (en) 1980-02-28
NL7801250A (en) 1978-08-08
DE2704822A1 (en) 1978-08-10
DE2704822C3 (en) 1980-10-23
CH628761A5 (en) 1982-03-15
SE7801246L (en) 1978-08-06
ATA68478A (en) 1983-11-15
DK52378A (en) 1978-08-06
SE418442B (en) 1981-05-25

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Legal Events

Date Code Title Description
ST Notification of lapse