FR822144A - Acoustic devices - Google Patents

Acoustic devices

Info

Publication number
FR822144A
FR822144A FR822144DA FR822144A FR 822144 A FR822144 A FR 822144A FR 822144D A FR822144D A FR 822144DA FR 822144 A FR822144 A FR 822144A
Authority
FR
France
Prior art keywords
acoustic devices
acoustic
devices
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.)
Thales SA
Original Assignee
Le Materiel Telephonique Thomson CSF
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 Le Materiel Telephonique Thomson CSF filed Critical Le Materiel Telephonique Thomson CSF
Application granted granted Critical
Publication of FR822144A publication Critical patent/FR822144A/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
    • 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
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/222—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only  for microphones

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
FR822144D 1936-09-09 1937-05-22 Acoustic devices Expired FR822144A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US99910A US2131593A (en) 1936-09-09 1936-09-09 Acoustic device

Publications (1)

Publication Number Publication Date
FR822144A true FR822144A (en) 1937-12-21

Family

ID=22277206

Family Applications (1)

Application Number Title Priority Date Filing Date
FR822144D Expired FR822144A (en) 1936-09-09 1937-05-22 Acoustic devices

Country Status (5)

Country Link
US (1) US2131593A (en)
CH (1) CH201674A (en)
FR (1) FR822144A (en)
GB (1) GB473878A (en)
NL (1) NL47966C (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB656723A (en) * 1948-01-10 1951-08-29 Edward Shipton Improvements in or relating to telephone instruments
US4529059A (en) * 1982-12-27 1985-07-16 Federal Signal Corporation Vibrating diaphragm type audible device with acoustically improved grille and method
US7697698B2 (en) * 2003-08-22 2010-04-13 William Sumner Brown Sound-based vehicle safety system
USD760204S1 (en) * 2015-01-05 2016-06-28 Gibson Brands, Inc. Microphone
USD760704S1 (en) * 2015-01-05 2016-07-05 Gibson Brands, Inc. Microphone
USD760203S1 (en) * 2015-01-05 2016-06-28 Gibson Brands, Inc. Microphone
USD808937S1 (en) * 2016-12-30 2018-01-30 Liangyi Zheng Microphone
USD840476S1 (en) * 2017-07-10 2019-02-12 MerchSource, LLC Kid's microphone
JP1666937S (en) * 2019-09-05 2020-08-31
USD899407S1 (en) * 2020-03-21 2020-10-20 Shenzhen Xunweijia Technology Development Co., Ltd. Microphone
USD918876S1 (en) * 2020-05-19 2021-05-11 Shenzhen Xunweijia Technology Development Co., Shenzhen Microphone

Also Published As

Publication number Publication date
US2131593A (en) 1938-09-27
GB473878A (en) 1937-10-21
CH201674A (en) 1938-12-15
NL47966C (en)

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