GB487566A - Earcap for telephone receivers or mouth-piece for microphones - Google Patents

Earcap for telephone receivers or mouth-piece for microphones

Info

Publication number
GB487566A
GB487566A GB27356/37A GB2735637A GB487566A GB 487566 A GB487566 A GB 487566A GB 27356/37 A GB27356/37 A GB 27356/37A GB 2735637 A GB2735637 A GB 2735637A GB 487566 A GB487566 A GB 487566A
Authority
GB
United Kingdom
Prior art keywords
earcap
channels
microphones
mouth
piece
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
GB27356/37A
Other languages
English (en)
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.)
NIELS PAUL ROBERT JARNAK
Original Assignee
NIELS PAUL ROBERT JARNAK
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 NIELS PAUL ROBERT JARNAK filed Critical NIELS PAUL ROBERT JARNAK
Publication of GB487566A publication Critical patent/GB487566A/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; ELECTRIC HEARING AIDS; 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 

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
GB27356/37A 1936-10-05 1937-10-05 Earcap for telephone receivers or mouth-piece for microphones Expired GB487566A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK55033T 1936-10-05
FR841086T 1938-07-25

Publications (1)

Publication Number Publication Date
GB487566A true GB487566A (en) 1938-06-22

Family

ID=8142986

Family Applications (1)

Application Number Title Priority Date Filing Date
GB27356/37A Expired GB487566A (en) 1936-10-05 1937-10-05 Earcap for telephone receivers or mouth-piece for microphones

Country Status (5)

Country Link
US (1) US2153044A (de)
CH (1) CH200196A (de)
DK (1) DK55033C (de)
FR (1) FR841086A (de)
GB (1) GB487566A (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE847921C (de) * 1950-10-29 1952-08-28 Lab Wennebostel Dr Ing Sennhei Lautsprecher mit Rohrleitung
DE940167C (de) * 1953-07-01 1956-03-15 Carl Schmidbauer Einsprachevorrichtung fuer ein raumschallunempfindliches und akustisch rueckkopplungsfreies Mikrofon
US3084229A (en) * 1960-03-11 1963-04-02 Ampex Electrostatic earphone
US4189627A (en) * 1978-11-27 1980-02-19 Bell Telephone Laboratories, Incorporated Electroacoustic transducer filter assembly
US20240257793A1 (en) * 2023-01-27 2024-08-01 U.S. Army DEVCOM, Army Research Laboratory Metamaterial Acoustic Barrier Using Vortex Generation for Internal Circulation

Also Published As

Publication number Publication date
CH200196A (de) 1938-09-30
FR841086A (fr) 1939-05-10
US2153044A (en) 1939-04-04
DK55033C (da) 1938-08-01

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