FR541254A - Device for keeping the pitch constant in sound emitter installations - Google Patents

Device for keeping the pitch constant in sound emitter installations

Info

Publication number
FR541254A
FR541254A FR541254DA FR541254A FR 541254 A FR541254 A FR 541254A FR 541254D A FR541254D A FR 541254DA FR 541254 A FR541254 A FR 541254A
Authority
FR
France
Prior art keywords
installations
keeping
sound emitter
pitch constant
pitch
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.)
Signal GmbH
Original Assignee
Signal GmbH
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 Signal GmbH filed Critical Signal GmbH
Application granted granted Critical
Publication of FR541254A publication Critical patent/FR541254A/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)
  • Selective Calling Equipment (AREA)
FR541254D 1917-10-01 1921-03-30 Device for keeping the pitch constant in sound emitter installations Expired FR541254A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE148975X 1917-10-01

Publications (1)

Publication Number Publication Date
FR541254A true FR541254A (en) 1922-07-25

Family

ID=5673086

Family Applications (1)

Application Number Title Priority Date Filing Date
FR541254D Expired FR541254A (en) 1917-10-01 1921-03-30 Device for keeping the pitch constant in sound emitter installations

Country Status (2)

Country Link
FR (1) FR541254A (en)
GB (1) GB148975A (en)

Also Published As

Publication number Publication date
GB148975A (en) 1921-10-10

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