BE434831A - - Google Patents

Info

Publication number
BE434831A
BE434831A BE434831A BE434831A BE434831A BE 434831 A BE434831 A BE 434831A BE 434831 A BE434831 A BE 434831A BE 434831 A BE434831 A BE 434831A BE 434831 A BE434831 A BE 434831A
Authority
BE
Belgium
Prior art keywords
sheets
screen
screen according
vibrating
perforated
Prior art date
Application number
BE434831A
Other languages
English (en)
French (fr)
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 filed Critical
Priority to BE434831A priority Critical patent/BE434831A/fr
Publication of BE434831A publication Critical patent/BE434831A/fr
Priority to BE450084A priority patent/BE450084A/fr

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
    • H04R1/32—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
    • H04R1/345—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 for loudspeakers
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/54—Accessories
    • G03B21/56—Projection screens
    • G03B21/565—Screens allowing free passage of sound

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
BE434831A 1939-06-10 1939-06-10 BE434831A (cs)

Priority Applications (2)

Application Number Priority Date Filing Date Title
BE434831A BE434831A (cs) 1939-06-10 1939-06-10
BE450084A BE450084A (cs) 1939-06-10 1943-04-09

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE434831A BE434831A (cs) 1939-06-10 1939-06-10

Publications (1)

Publication Number Publication Date
BE434831A true BE434831A (cs) 1939-07-08

Family

ID=3869809

Family Applications (2)

Application Number Title Priority Date Filing Date
BE434831A BE434831A (cs) 1939-06-10 1939-06-10
BE450084A BE450084A (cs) 1939-06-10 1943-04-09

Family Applications After (1)

Application Number Title Priority Date Filing Date
BE450084A BE450084A (cs) 1939-06-10 1943-04-09

Country Status (1)

Country Link
BE (2) BE434831A (cs)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014175747A1 (en) * 2013-04-24 2014-10-30 Momentor Ans Screen

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014175747A1 (en) * 2013-04-24 2014-10-30 Momentor Ans Screen
EP2989503A4 (en) * 2013-04-24 2016-10-19 Momentor Ans SCREEN
US9500942B2 (en) 2013-04-24 2016-11-22 Momentor Ans Screen

Also Published As

Publication number Publication date
BE450084A (cs) 1943-05-31

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