GB191213615A - Improvements in or relating to Acoustic Signalling Devices. - Google Patents

Improvements in or relating to Acoustic Signalling Devices.

Info

Publication number
GB191213615A
GB191213615A GB191213615DA GB191213615A GB 191213615 A GB191213615 A GB 191213615A GB 191213615D A GB191213615D A GB 191213615DA GB 191213615 A GB191213615 A GB 191213615A
Authority
GB
United Kingdom
Prior art keywords
microphones
relating
signalling devices
circuit
acoustic signalling
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
English (en)
Inventor
Aurel Meckel
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of GB191213615A publication Critical patent/GB191213615A/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)
  • Time Recorders, Dirve Recorders, Access Control (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
  • Circuit For Audible Band Transducer (AREA)
GB191213615D 1911-06-10 1912-06-10 Improvements in or relating to Acoustic Signalling Devices. Expired GB191213615A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE256747T 1911-06-10

Publications (1)

Publication Number Publication Date
GB191213615A true GB191213615A (en) 1913-06-10

Family

ID=32604293

Family Applications (1)

Application Number Title Priority Date Filing Date
GB191213615D Expired GB191213615A (en) 1911-06-10 1912-06-10 Improvements in or relating to Acoustic Signalling Devices.

Country Status (3)

Country Link
DE (3) DE256747C (enExample)
FR (1) FR444805A (enExample)
GB (1) GB191213615A (enExample)

Also Published As

Publication number Publication date
DE256747C (enExample)
DE257211C (enExample)
DE257212C (enExample)
FR444805A (fr) 1912-10-26

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