DE291124C - - Google Patents

Info

Publication number
DE291124C
DE291124C DENDAT291124D DE291124DA DE291124C DE 291124 C DE291124 C DE 291124C DE NDAT291124 D DENDAT291124 D DE NDAT291124D DE 291124D A DE291124D A DE 291124DA DE 291124 C DE291124 C DE 291124C
Authority
DE
Germany
Prior art keywords
sound
permeable
walls
filled
detector
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.)
Active
Application number
DENDAT291124D
Other languages
German (de)
English (en)
Publication of DE291124C publication Critical patent/DE291124C/de
Active 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)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
DENDAT291124D Active DE291124C (enrdf_load_stackoverflow)

Publications (1)

Publication Number Publication Date
DE291124C true DE291124C (enrdf_load_stackoverflow)

Family

ID=546031

Family Applications (1)

Application Number Title Priority Date Filing Date
DENDAT291124D Active DE291124C (enrdf_load_stackoverflow)

Country Status (1)

Country Link
DE (1) DE291124C (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2658186A (en) * 1942-03-12 1953-11-03 Bell Telephone Labor Inc Prismatic directional and object locating system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2658186A (en) * 1942-03-12 1953-11-03 Bell Telephone Labor Inc Prismatic directional and object locating system

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