NL77682C - - Google Patents

Info

Publication number
NL77682C
NL77682C NL77682DA NL77682C NL 77682 C NL77682 C NL 77682C NL 77682D A NL77682D A NL 77682DA NL 77682 C NL77682 C NL 77682C
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 NL77682C publication Critical patent/NL77682C/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
    • H04R1/32—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
    • H04R1/36—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 by using a single aperture of dimensions not greater than the shortest operating wavelength
NL77682D 1947-09-10 NL77682C (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB283814X 1947-09-10

Publications (1)

Publication Number Publication Date
NL77682C true NL77682C (fr)

Family

ID=10274751

Family Applications (1)

Application Number Title Priority Date Filing Date
NL77682D NL77682C (fr) 1947-09-10

Country Status (7)

Country Link
US (1) US2646851A (fr)
BE (2) BE522721A (fr)
CH (1) CH283814A (fr)
DE (1) DE944860C (fr)
FR (1) FR971128A (fr)
GB (1) GB659063A (fr)
NL (1) NL77682C (fr)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2694462A (en) * 1951-09-19 1954-11-16 Robbins Frank Acoustic system for loud-speakers
US2694463A (en) * 1952-04-07 1954-11-16 Robbins Frank Acoustic system for loud-speakers
US2787332A (en) * 1952-09-06 1957-04-02 Norman C Fulmer Loud-speaker system
DE1130472B (de) * 1957-11-22 1962-05-30 Philco Corp Lautsprechermembran
US3146848A (en) * 1958-08-25 1964-09-01 John O Fundingsland Hi-fidelity speaker
GB1557879A (en) * 1976-12-03 1979-12-12 Rank Organisation Ltd Electro acoustic transducers
US4207963A (en) * 1978-12-11 1980-06-17 Integrated Sound Systems Inc. Loudspeaker system
DE3407980A1 (de) * 1983-04-20 1984-10-25 Tadashi Tokio/Tokyo Sawafuji Kristallschallerzeuger
CA1271247A (fr) * 1987-01-14 1990-07-03 Gerard S. Mindel Cellule de charge et de dispersion pour le son
FR2649572B1 (fr) * 1989-07-07 1991-09-20 Thomson Consumer Electronics Dispositif de reproduction sonore pour televiseurs
GB2425436B (en) * 2005-04-21 2007-06-06 Martin Audio Ltd Acoustic loading device for loudspeakers
US7520368B2 (en) * 2007-06-08 2009-04-21 Moore Dana A Horizontally folded reflex-ported bass horn enclosure
US7513332B2 (en) * 2007-09-12 2009-04-07 Moore Dana A Convertible folded horn enclosure with improved compactness

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US272866A (en) * 1883-02-27 Speaking-trumpet for receiving-telephones
US1616474A (en) * 1925-03-05 1927-02-08 Charles F Stehlin Tone-developing loud speaker
US1865735A (en) * 1929-04-01 1932-07-05 Rca Corp Sound reproducer
GB404937A (en) * 1932-07-14 1934-01-15 William Robertson Millar Improvements in sound-modifying devices for loud speakers or the like
FR791142A (fr) * 1934-09-06 1935-12-04 Dispositif protecteur et amplificateur de son pour hauts-parleurs de t. s. f.
US2214393A (en) * 1938-09-10 1940-09-10 Ingraham E Co Acoustical equalizer
US2373692A (en) * 1942-10-03 1945-04-17 Ray L Smith Loud-speaker

Also Published As

Publication number Publication date
US2646851A (en) 1953-07-28
BE484735A (fr)
BE522721A (fr)
CH283814A (fr) 1952-06-30
DE944860C (de) 1956-06-28
FR971128A (fr) 1951-01-12
GB659063A (en) 1951-10-17

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