FR64910E - Improvements to doubling signaling devices - Google Patents

Improvements to doubling signaling devices

Info

Publication number
FR64910E
FR64910E FR64910DA FR64910E FR 64910 E FR64910 E FR 64910E FR 64910D A FR64910D A FR 64910DA FR 64910 E FR64910 E FR 64910E
Authority
FR
France
Prior art keywords
doubling
signaling devices
signaling
devices
doubling signaling
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.)
PHYSIKALISCH TECH WERKSTATTEN
Original Assignee
PHYSIKALISCH TECH WERKSTATTEN
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 PHYSIKALISCH TECH WERKSTATTEN filed Critical PHYSIKALISCH TECH WERKSTATTEN
Application granted granted Critical
Publication of FR64910E publication Critical patent/FR64910E/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R17/00—Piezoelectric transducers; Electrostrictive transducers
    • H04R17/10—Resonant transducers, i.e. adapted to produce maximum output at a predetermined frequency
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B3/00—Audible signalling systems; Audible personal calling systems
    • G08B3/10—Audible signalling systems; Audible personal calling systems using electric transmission; using electromagnetic transmission
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B7/00—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00
    • G08B7/06—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00 using electric transmission, e.g. involving audible and visible signalling through the use of sound and light sources
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/08—Mouthpieces; Microphones; Attachments therefor
    • H04R1/083—Special constructions of mouthpieces
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/08—Mouthpieces; Microphones; Attachments therefor
    • H04R1/083—Special constructions of mouthpieces
    • H04R1/086—Protective screens, e.g. all weather or wind screens

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Exhaust Silencers (AREA)
FR64910D 1951-07-24 1952-07-08 Improvements to doubling signaling devices Expired FR64910E (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEP5919A DE923354C (en) 1951-07-24 1951-07-24 Overtaking signal system

Publications (1)

Publication Number Publication Date
FR64910E true FR64910E (en) 1955-12-14

Family

ID=6626604

Family Applications (2)

Application Number Title Priority Date Filing Date
FR1047370D Expired FR1047370A (en) 1951-07-24 1951-12-28 Improvements to doubling signaling devices
FR64910D Expired FR64910E (en) 1951-07-24 1952-07-08 Improvements to doubling signaling devices

Family Applications Before (1)

Application Number Title Priority Date Filing Date
FR1047370D Expired FR1047370A (en) 1951-07-24 1951-12-28 Improvements to doubling signaling devices

Country Status (4)

Country Link
DE (1) DE923354C (en)
FR (2) FR1047370A (en)
GB (2) GB705450A (en)
IT (1) IT500018A (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2931020A (en) * 1955-07-11 1960-03-29 Thomas J Bender Secondary alarm system
DE1112927B (en) * 1956-05-08 1961-08-17 Tele F Lux Soc A R L Method for the electrical transmission of acoustic overtaking signals from vehicles
US3670689A (en) * 1970-03-20 1972-06-20 Falcon Safety Prod Tilt-operated hand held gas powered acoustic device
DE10003689C1 (en) * 2000-01-28 2001-05-23 Hella Kg Hueck & Co Power matching circuit for loudspeaker amplifier for automobile warning siren, has switching device connecting loudspeaker to different transformer windings or tap-off connections dependent on supply voltage
DE102017220474A1 (en) * 2017-11-16 2019-05-16 Robert Bosch Gmbh Device for airborne acoustic sensing of the surroundings of a vehicle, vehicle
EP3907502A1 (en) * 2020-05-08 2021-11-10 ABB Schweiz AG Sensing arrangement

Also Published As

Publication number Publication date
GB705450A (en) 1954-03-10
FR1047370A (en) 1953-12-14
GB717090A (en) 1954-10-20
IT500018A (en)
DE923354C (en) 1955-02-10

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