FR2250453A5 - Underwater acoustical remote control device - detects the absence of signals on the different frequencies - Google Patents

Underwater acoustical remote control device - detects the absence of signals on the different frequencies

Info

Publication number
FR2250453A5
FR2250453A5 FR7339022A FR7339022A FR2250453A5 FR 2250453 A5 FR2250453 A5 FR 2250453A5 FR 7339022 A FR7339022 A FR 7339022A FR 7339022 A FR7339022 A FR 7339022A FR 2250453 A5 FR2250453 A5 FR 2250453A5
Authority
FR
France
Prior art keywords
absence
outputs
different frequencies
detects
signals
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
Application number
FR7339022A
Other languages
French (fr)
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.)
Etat Francais
Original Assignee
Etat Francais
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 Etat Francais filed Critical Etat Francais
Priority to FR7339022A priority Critical patent/FR2250453A5/en
Application granted granted Critical
Publication of FR2250453A5 publication Critical patent/FR2250453A5/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B11/00—Transmission systems employing sonic, ultrasonic or infrasonic waves
    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C23/00—Non-electrical signal transmission systems, e.g. optical systems
    • G08C23/02—Non-electrical signal transmission systems, e.g. optical systems using infrasonic, sonic or ultrasonic waves

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)

Abstract

The receiver detects the absence of acoustic signals for at least one frequency. A band pass filter is connected top selective amplifiers whose pass bands are centred on different frequencies F1, F2 .. Fp encompassed by the pass band of the filter. The amplifier outputs are connected to integrating circuit such that the outputs p-q of the integrating circuits, with p-q, at least equal to 1, corresponding to frequencies Fv1 Fv2 .. Fvp, are each connected to an inverter and the p-q outputs of the inverters, as well as the q outputs of the integraters not followed by inverters are connected to the p inputs of an AND gate so that the gate output gives a signal corresponding to the logic function F1.F2.....Fq.Fv1.Fv2...Fvp-Q.
FR7339022A 1973-11-02 1973-11-02 Underwater acoustical remote control device - detects the absence of signals on the different frequencies Expired FR2250453A5 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7339022A FR2250453A5 (en) 1973-11-02 1973-11-02 Underwater acoustical remote control device - detects the absence of signals on the different frequencies

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7339022A FR2250453A5 (en) 1973-11-02 1973-11-02 Underwater acoustical remote control device - detects the absence of signals on the different frequencies

Publications (1)

Publication Number Publication Date
FR2250453A5 true FR2250453A5 (en) 1975-05-30

Family

ID=9127229

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7339022A Expired FR2250453A5 (en) 1973-11-02 1973-11-02 Underwater acoustical remote control device - detects the absence of signals on the different frequencies

Country Status (1)

Country Link
FR (1) FR2250453A5 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0066418A2 (en) * 1981-05-28 1982-12-08 BHR Electronic Systems Limited Sound operated start circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0066418A2 (en) * 1981-05-28 1982-12-08 BHR Electronic Systems Limited Sound operated start circuit
EP0066418A3 (en) * 1981-05-28 1983-10-12 BHR Electronic Systems Limited Sound operated start circuit

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Legal Events

Date Code Title Description
ST Notification of lapse