NL45821C - - Google Patents

Info

Publication number
NL45821C
NL45821C NL45821DA NL45821C NL 45821 C NL45821 C NL 45821C NL 45821D A NL45821D A NL 45821DA NL 45821 C NL45821 C NL 45821C
Authority
NL
Netherlands
Application number
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.)
Publication of NL45821C publication Critical patent/NL45821C/xx

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
    • H04R1/20—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
    • 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 
    • 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
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/34—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means
    • H04R1/38—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means in which sound waves act upon both sides of a diaphragm and incorporating acoustic phase-shifting means, e.g. pressure-gradient microphone

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
NL45821D 1934-12-29 NL45821C (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US759679A US2126566A (en) 1934-12-29 1934-12-29 Acoustic device

Publications (1)

Publication Number Publication Date
NL45821C true NL45821C (de)

Family

ID=25056553

Family Applications (2)

Application Number Title Priority Date Filing Date
NL43957D NL43957C (de) 1934-12-29
NL45821D NL45821C (de) 1934-12-29

Family Applications Before (1)

Application Number Title Priority Date Filing Date
NL43957D NL43957C (de) 1934-12-29

Country Status (5)

Country Link
US (1) US2126566A (de)
BE (1) BE412830A (de)
FR (1) FR799518A (de)
GB (1) GB464996A (de)
NL (2) NL45821C (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB552328A (en) * 1941-12-04 1943-04-01 Reslo Sound Equipment Ltd Improvements in or relating to loud speakers and the like
US2515031A (en) * 1948-03-31 1950-07-11 Bell Telephone Labor Inc Microphone having controllable directional response pattern
US2702318A (en) * 1951-01-10 1955-02-15 Astatic Corp Unidirectional microphone
DE1073545B (de) * 1953-06-02 1960-01-21 Akustische u Kino Gerate Ges mbH, Wien Dynamisches Rieht mikrophon
US3342285A (en) * 1966-12-19 1967-09-19 Standard Systems Comm Corp Combination pillow speaker and control unit
GB2168875A (en) * 1984-12-19 1986-06-25 Philips Electronic Associated Electroacoustic calling device

Also Published As

Publication number Publication date
GB464996A (en) 1937-04-29
BE412830A (de)
US2126566A (en) 1938-08-09
NL43957C (de)
FR799518A (fr) 1936-06-15

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