FR971273A - Improvements to sound detectors - Google Patents

Improvements to sound detectors

Info

Publication number
FR971273A
FR971273A FR971273DA FR971273A FR 971273 A FR971273 A FR 971273A FR 971273D A FR971273D A FR 971273DA FR 971273 A FR971273 A FR 971273A
Authority
FR
France
Prior art keywords
sound detectors
detectors
sound
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
Other languages
French (fr)
Inventor
Jean Auscher
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 filed Critical
Application granted granted Critical
Publication of FR971273A publication Critical patent/FR971273A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
    • G01S1/72—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using ultrasonic, sonic or infrasonic waves

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
FR971273D 1947-03-22 1940-03-13 Improvements to sound detectors Expired FR971273A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR56745T 1947-03-22

Publications (1)

Publication Number Publication Date
FR971273A true FR971273A (en) 1951-01-15

Family

ID=8690902

Family Applications (2)

Application Number Title Priority Date Filing Date
FR971273D Expired FR971273A (en) 1947-03-22 1940-03-13 Improvements to sound detectors
FR56745D Expired FR56745E (en) 1947-03-22 1947-03-22 Improvements to sound detectors

Family Applications After (1)

Application Number Title Priority Date Filing Date
FR56745D Expired FR56745E (en) 1947-03-22 1947-03-22 Improvements to sound detectors

Country Status (1)

Country Link
FR (2) FR971273A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3243525A (en) * 1962-11-13 1966-03-29 Eaton Arthur Hearing intensifying and directing apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3243525A (en) * 1962-11-13 1966-03-29 Eaton Arthur Hearing intensifying and directing apparatus

Also Published As

Publication number Publication date
FR56745E (en) 1952-10-03

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