FR577420A - Improvements to sound wave detection devices - Google Patents

Improvements to sound wave detection devices

Info

Publication number
FR577420A
FR577420A FR577420DA FR577420A FR 577420 A FR577420 A FR 577420A FR 577420D A FR577420D A FR 577420DA FR 577420 A FR577420 A FR 577420A
Authority
FR
France
Prior art keywords
sound wave
detection devices
wave detection
devices
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)
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.)
WALKER SIGNAL AND EQUIPMENT CO
Original Assignee
WALKER SIGNAL AND EQUIPMENT CO
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 WALKER SIGNAL AND EQUIPMENT CO filed Critical WALKER SIGNAL AND EQUIPMENT CO
Application granted granted Critical
Publication of FR577420A publication Critical patent/FR577420A/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)
  • Rehabilitation Tools (AREA)
FR577420D 1924-02-11 1924-02-18 Improvements to sound wave detection devices Expired FR577420A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB354524A GB219604A (en) 1924-02-11 1924-02-11 Improvements in sound detecting apparatus

Publications (1)

Publication Number Publication Date
FR577420A true FR577420A (en) 1924-09-05

Family

ID=9760345

Family Applications (1)

Application Number Title Priority Date Filing Date
FR577420D Expired FR577420A (en) 1924-02-11 1924-02-18 Improvements to sound wave detection devices

Country Status (2)

Country Link
FR (1) FR577420A (en)
GB (1) GB219604A (en)

Also Published As

Publication number Publication date
GB219604A (en) 1924-07-31

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