EP0184811B1 - Verfahren zur analogen Sprachübertragung über Funk - Google Patents

Verfahren zur analogen Sprachübertragung über Funk Download PDF

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Publication number
EP0184811B1
EP0184811B1 EP85115658A EP85115658A EP0184811B1 EP 0184811 B1 EP0184811 B1 EP 0184811B1 EP 85115658 A EP85115658 A EP 85115658A EP 85115658 A EP85115658 A EP 85115658A EP 0184811 B1 EP0184811 B1 EP 0184811B1
Authority
EP
European Patent Office
Prior art keywords
audio
transmitting
receiving
speech
pulses
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.)
Expired - Lifetime
Application number
EP85115658A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0184811A3 (en
EP0184811A2 (de
Inventor
Bodo Dipl.-Math. Rittenauer
Werner Dipl.-Ing. Kober
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to AT85115658T priority Critical patent/ATE61503T1/de
Publication of EP0184811A2 publication Critical patent/EP0184811A2/de
Publication of EP0184811A3 publication Critical patent/EP0184811A3/de
Application granted granted Critical
Publication of EP0184811B1 publication Critical patent/EP0184811B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K1/00—Secret communication

Definitions

  • the invention relates to a method for analog voice transmission via radio using transceiver stations for tactical use, in particular mobile transceiver stations.
  • transceiver stations are equipped with an encryption device for security against eavesdropping and can be switched to a frequency hopping mode to increase the interference resistance of a connection.
  • Both the use of encryption and the use of one Frequency hopping procedures on their own or together provide sufficient security against the intrusion of a potential opponent into an existing radio connection.
  • both methods reduce the availability of an existing connection.
  • the invention has for its object to provide a simple solution for the transmission of voice signals between transceiver stations in tactical use, which makes it possible to specify a simple solution even when transmitting an unencrypted voice signal in analog form, which is possible with this type of transmission unnoticed intrusion of a potential opponent in a radio connection is prevented with certainty.
  • FIG. 1 shows on the left side the transmission side SS and on the right side the reception side ES of two transceiver stations which use the method according to the invention to identify the intrusion of a potential opponent into the connection.
  • the block diagram of the transmission side SS shows a microphone M for voice inputs, the output of which is connected to the modulation input of the transmitter S via the changeover switch U.
  • the analog voice signal is modulated onto a radio frequency carrier in a suitable manner and rotated via the antenna A to the reception side ES .
  • the changeover switch U the first switch contact of which represents the microphone output, is connected via its second switch contact to the tone generator G, which generates a tone-frequency oscillation, for example at 1.6 kHz.
  • the changeover switch U is controlled by a pseudo random generator PNG, the setting and the clock of which is derived from the station clock UHR.
  • the pseudo random generator PNG controls the changeover switch U in such a way that the time of the order of ⁇ ⁇ ⁇ 20 msec is briefly switched on to the modulation input of the transmitter in periods of pseudo random change.
  • the analog voice signal is then interspersed at irregular time intervals with sound pulses whose occurrence in time when the transmitting side SS is synchronized with the receiving side ES in advance is known on the reception side ES .
  • the resulting speech signal gaps represent practically no loss of quality for the speech signal.
  • the receiving side ES has an antenna A, via which the receiver E receives the radio-frequency carrier modulated with the speech signal and represents the speech signal in the baseband level.
  • the analog voice signal interspersed with the sound pulses is fed to a voice output, for example in the form of a receiver H, via the closed switch s1.
  • a sound demodulator TD is connected to the output of the receiver E via the bandpass filter BP, which is always connected on the output side via a further switch s2 to an evaluation device AW when a window for the insertion of a sound pulse is to be expected in the incoming analog voice signal.
  • the switch s2 is controlled on the transmission side by an identical pseudo random generator PNG, which is set via the station clock UHR and receives the corresponding clock from this station clock.
  • the evaluation device AW is designed in such a way that it activates an alarm device AG on the output side if the expected successive sound pulses are repeatedly absent and at the same time interrupts the connection between the output of the receiver E and the receiver H via the switch s1. This ensures that if a potential opponent enters, this is recognized by the incorrect reception of the sound impulses and the connection is interrupted.
  • transceivers for tactical use are usually included a key device and a possibility for the application of a frequency hopping method equipped with a corresponding device for which a pseudo random generator is also required.
  • This pseudo random generator can thus be used in an extremely advantageous manner for carrying out the method according to the invention.
  • the time diagram of FIG. 2 shows a signal flow sequence over time t as it is present at the modulation input of the transmitter S on the transmission side SS and at the output of the receiver E on the reception side ES .
  • the analog voice signal ASS is interrupted here in pseudorandomly different time intervals by a window F in which a sound pulse TE is transmitted.
  • the width of each window representing an interruption of the analog voice signal ASS is so small that the speech quality at the output of the receiver H on the receiving side ES is practically not impaired.
  • the invention represents an additional measure within a bundle of measures for interference resistance for transmitting / receiving stations in tactical use and is therefore particularly suitable for use in mobile radio stations for land, water and aircraft.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Transmitters (AREA)
  • Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
  • Radio Transmission System (AREA)
  • Transceivers (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
  • Toys (AREA)
  • Developing Agents For Electrophotography (AREA)
EP85115658A 1984-12-12 1985-12-09 Verfahren zur analogen Sprachübertragung über Funk Expired - Lifetime EP0184811B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85115658T ATE61503T1 (de) 1984-12-12 1985-12-09 Verfahren zur analogen sprachuebertragung ueber funk.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3445312 1984-12-12
DE3445312 1984-12-12

Publications (3)

Publication Number Publication Date
EP0184811A2 EP0184811A2 (de) 1986-06-18
EP0184811A3 EP0184811A3 (en) 1988-01-13
EP0184811B1 true EP0184811B1 (de) 1991-03-06

Family

ID=6252587

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85115658A Expired - Lifetime EP0184811B1 (de) 1984-12-12 1985-12-09 Verfahren zur analogen Sprachübertragung über Funk

Country Status (8)

Country Link
EP (1) EP0184811B1 (fi)
AT (1) ATE61503T1 (fi)
DE (1) DE3582023D1 (fi)
ES (1) ES8701442A1 (fi)
FI (1) FI79216C (fi)
IN (1) IN163475B (fi)
NO (1) NO166308C (fi)
PT (1) PT81651B (fi)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10016133C2 (de) * 2000-03-31 2002-06-20 Siemens Ag Verfahren zum Sichern einer berührungslosen Signalübertragung von einem Sender zu einem Empfänger sowie Signalübertragungseinrichtung

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE521991C (de) * 1928-08-17 1931-03-28 Telefunken Gmbh Verfahren zur geheimen UEbermittlung í¬ insbesondere von Telephoniestroemen í¬ mittels modulierter Hochfrequenz
CH559483A5 (fi) * 1973-06-12 1975-02-28 Patelhold Patentverwertung
DE2952158A1 (de) * 1979-12-22 1981-06-25 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Funk-nachrichtenuebertragungsverfahren mit begrenzten, insbesondere sehr kurzen sendezeiten und empfaenger hierfuer
DE3012513C2 (de) * 1980-03-31 1984-04-26 Siemens AG, 1000 Berlin und 8000 München Verfahren zur Überwachung analoger und digitaler Funkverbindungen
JPS58198934A (ja) * 1982-05-17 1983-11-19 Sony Corp 秘話装置
GB2128453A (en) * 1982-10-08 1984-04-26 Philips Electronic Associated System identification in communications systems

Also Published As

Publication number Publication date
IN163475B (fi) 1988-10-01
NO166308B (no) 1991-03-18
PT81651A (pt) 1986-06-11
NO166308C (no) 1991-06-26
ATE61503T1 (de) 1991-03-15
EP0184811A3 (en) 1988-01-13
ES8701442A1 (es) 1986-11-16
FI854900A0 (fi) 1985-12-11
EP0184811A2 (de) 1986-06-18
PT81651B (pt) 1994-07-29
FI854900A (fi) 1986-06-13
DE3582023D1 (de) 1991-04-11
NO855007L (no) 1986-06-13
FI79216C (fi) 1989-11-10
FI79216B (fi) 1989-07-31
ES549878A0 (es) 1986-11-16

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