FR2358784A1 - Digital coder for analogue signals - inverts rearranged digital samples using memory and transforms for transmission - Google Patents

Digital coder for analogue signals - inverts rearranged digital samples using memory and transforms for transmission

Info

Publication number
FR2358784A1
FR2358784A1 FR7621623A FR7621623A FR2358784A1 FR 2358784 A1 FR2358784 A1 FR 2358784A1 FR 7621623 A FR7621623 A FR 7621623A FR 7621623 A FR7621623 A FR 7621623A FR 2358784 A1 FR2358784 A1 FR 2358784A1
Authority
FR
France
Prior art keywords
digital
memory
inverts
samples
transmission
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.)
Granted
Application number
FR7621623A
Other languages
French (fr)
Other versions
FR2358784B1 (en
Inventor
Christian Magnien
Fernand Secher
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.)
SLE CITEREL STE LANNIONNAISE E
Original Assignee
SLE CITEREL STE LANNIONNAISE E
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 SLE CITEREL STE LANNIONNAISE E filed Critical SLE CITEREL STE LANNIONNAISE E
Priority to FR7621623A priority Critical patent/FR2358784A1/en
Publication of FR2358784A1 publication Critical patent/FR2358784A1/en
Application granted granted Critical
Publication of FR2358784B1 publication Critical patent/FR2358784B1/fr
Granted 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/06—Continuously compensating for, or preventing, undesired influence of physical parameters
    • H03M1/08—Continuously compensating for, or preventing, undesired influence of physical parameters of noise

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Theoretical Computer Science (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)

Abstract

The digital coder, for analogue signals, divides the signals into consecutive groups, inverts these groups and/or rearranges them amongst themselves. The groups are delineated by the points in time when the signal assumes a given value or when the signal and the sign of its first derivative have given values. The analogue signal is converted into digital samples. The samples are inverted and/or permutated using a digital memory. The memory is read and the samples transformed into signals for transmission. The reverse process takes place at the receiver.
FR7621623A 1976-07-15 1976-07-15 Digital coder for analogue signals - inverts rearranged digital samples using memory and transforms for transmission Granted FR2358784A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7621623A FR2358784A1 (en) 1976-07-15 1976-07-15 Digital coder for analogue signals - inverts rearranged digital samples using memory and transforms for transmission

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7621623A FR2358784A1 (en) 1976-07-15 1976-07-15 Digital coder for analogue signals - inverts rearranged digital samples using memory and transforms for transmission

Publications (2)

Publication Number Publication Date
FR2358784A1 true FR2358784A1 (en) 1978-02-10
FR2358784B1 FR2358784B1 (en) 1978-12-15

Family

ID=9175752

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7621623A Granted FR2358784A1 (en) 1976-07-15 1976-07-15 Digital coder for analogue signals - inverts rearranged digital samples using memory and transforms for transmission

Country Status (1)

Country Link
FR (1) FR2358784A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0322059A1 (en) * 1987-12-23 1989-06-28 Philips Electronique Grand Public Sound scrambling/descrambling system and method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2240057A1 (en) * 1972-08-16 1974-02-28 Licentia Gmbh METHOD OF DISCLOSURE OF MESSAGES
FR2207627A5 (en) * 1972-11-22 1974-06-14 Dassault Electronique

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2240057A1 (en) * 1972-08-16 1974-02-28 Licentia Gmbh METHOD OF DISCLOSURE OF MESSAGES
FR2207627A5 (en) * 1972-11-22 1974-06-14 Dassault Electronique

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0322059A1 (en) * 1987-12-23 1989-06-28 Philips Electronique Grand Public Sound scrambling/descrambling system and method
FR2625391A1 (en) * 1987-12-23 1989-06-30 Radiotechnique Ind & Comm METHOD AND SYSTEM FOR INTERFERING / UNLOCKING SOUND
US4965826A (en) * 1987-12-23 1990-10-23 U.S. Philips Corporation Method of and system for scrambling/descrambling sound

Also Published As

Publication number Publication date
FR2358784B1 (en) 1978-12-15

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Legal Events

Date Code Title Description
TP Transmission of property
ST Notification of lapse