BE478254A - Appareils electro-acoustiques - Google Patents

Appareils electro-acoustiques

Info

Publication number
BE478254A
BE478254A BE478254DA BE478254A BE 478254 A BE478254 A BE 478254A BE 478254D A BE478254D A BE 478254DA BE 478254 A BE478254 A BE 478254A
Authority
BE
Belgium
Prior art keywords
electro
acoustic devices
acoustic
devices
Prior art date
Application number
Other languages
English (en)
Original Assignee
Bell Telephone Manufacturing Company S.A.
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
Priority claimed from GB15574/44A external-priority patent/GB594082A/en
Priority claimed from GB21942/45A external-priority patent/GB616158A/en
Application filed by Bell Telephone Manufacturing Company S.A. filed Critical Bell Telephone Manufacturing Company S.A.
Publication of BE478254A publication Critical patent/BE478254A/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
    • H04R21/00—Variable-resistance transducers
    • H04R21/02—Microphones
    • H04R21/021—Microphones with granular resistance material
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
    • G01S1/72—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using ultrasonic, sonic or infrasonic waves
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/12—Non-planar diaphragms or cones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/16—Mounting or tensioning of diaphragms or cones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06—Loudspeakers

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
  • Toys (AREA)
BE478254D 1944-08-15 1947-12-17 Appareils electro-acoustiques BE478254A (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB15574/44A GB594082A (en) 1945-08-27 1944-08-15 Improvements in or relating to microphones
GB21942/45A GB616158A (en) 1944-08-15 1945-08-27 Improvements in or relating to electro-acoustic devices
GB2131/47A GB631970A (en) 1944-08-15 1947-01-23 Improvements in or relating to acoustic diaphragms

Publications (1)

Publication Number Publication Date
BE478254A true BE478254A (fr) 1948-05-17

Family

ID=36952628

Family Applications (3)

Application Number Title Priority Date Filing Date
BE482597D BE482597A (fr) 1944-08-15
BE477474D BE477474A (fr) 1944-08-15 1947-11-20 Ameliorations apportees aux microphones
BE478254D BE478254A (fr) 1944-08-15 1947-12-17 Appareils electro-acoustiques

Family Applications Before (2)

Application Number Title Priority Date Filing Date
BE482597D BE482597A (fr) 1944-08-15
BE477474D BE477474A (fr) 1944-08-15 1947-11-20 Ameliorations apportees aux microphones

Country Status (6)

Country Link
US (2) US2521744A (fr)
BE (3) BE477474A (fr)
CH (2) CH271258A (fr)
DE (3) DE940654C (fr)
FR (3) FR939111A (fr)
GB (1) GB631970A (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012220006A1 (de) * 2012-11-02 2014-05-08 Robert Bosch Gmbh Bauelement mit einer mikromechanischen Mikrofonstruktur
USD966235S1 (en) 2019-08-23 2022-10-11 Tymphany Acoustic Technology Limited Waveguide

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1141107A (en) * 1902-01-27 1915-06-01 Kellogg Switchboard & Supply Telephone-transmitter.
AU107204B (en) * 1904-07-15 1905-06-27 And Improvements inthe wheels of steam or gas turbines
US1226886A (en) * 1913-05-13 1917-05-22 New Jersey Patent Co Telephone-transmitter.
US1352939A (en) * 1917-02-24 1920-09-14 Western Electric Co Telephone-transmitter
US1869230A (en) * 1929-08-16 1932-07-26 Philadelphia Storage Battery Electrical element
US1848433A (en) * 1929-09-09 1932-03-08 Magnavox Co Loud speaker element
US1846351A (en) * 1930-06-13 1932-02-23 Murkham Leonard Walter Electrodynamic sound-reproducing device
US1943425A (en) * 1931-12-26 1934-01-16 Kellogg Switchboard & Supply Diaphragm
US2069242A (en) * 1933-01-19 1937-02-02 George A Graham Electroacoustic energy converting system
US1930328A (en) * 1933-01-25 1933-10-10 Tichenor Sound reproducing diaphragm
BE402491A (fr) * 1933-05-11
GB425558A (en) * 1933-10-26 1935-03-18 Alfred Graham & Co Ltd Improvements relating to telephones
GB425186A (en) * 1933-11-24 1935-03-08 Alfred Graham & Co Ltd Improvements relating to telephones
US2043833A (en) * 1934-11-12 1936-06-09 Abraham I Klotz Protecting framing for brief cases
US2191992A (en) * 1937-03-31 1940-02-27 Int Standard Electric Corp Telephone transmitter
US2293078A (en) * 1939-12-05 1942-08-18 B A Proctor Company Inc Microphone
CH220358A (de) * 1940-10-26 1942-03-31 Fides Gmbh Kapselmikrofon.

Also Published As

Publication number Publication date
DE862768C (de) 1953-01-12
FR57814E (fr) 1953-09-17
DE873103C (de) 1953-04-09
BE477474A (fr) 1948-05-20
DE940654C (de) 1956-03-22
CH271258A (fr) 1950-10-15
FR939111A (fr) 1948-11-04
US2539488A (en) 1951-01-30
CH263325A (de) 1949-08-31
FR58186E (fr) 1953-09-29
BE482597A (fr)
US2521744A (en) 1950-09-12
GB631970A (en) 1949-11-14

Similar Documents

Publication Publication Date Title
FR929705A (fr) Appareil de reproduction stéréophonique
FR950058A (fr) Appareil acoustique
BE478254A (fr) Appareils electro-acoustiques
FR926035A (fr) Perfectionnements aux appareils téléimprimeurs
FR926630A (fr) Récepteurs
FR939127A (fr) Microphones
FR994075A (fr) Microphone
FR939043A (fr) Appareils indicateurs
FI22369A (fi) Dörr-dörrkarm-aggregat
FR939433A (fr) Appareils électro-acoustiques
FR992956A (fr) Microphone
FR908915A (fr) Perfectionnement aux appareils de radio-guidage
FR910621A (fr) Haut-parleur électrodynamique
ES9874Y (es) Caja-envase
FI20739A (fi) Dammsugaremunstycke
FI24188A (fi) Draghäktanordning
FI22365A (fi) Vätskespridare
FI22339A (fi) Lerkrukpress
FI22300A (fi) Lufttätt tillslutet kärl
FI22296A (fi) Radiomottagare
FI22227A (fi) Kopplingsskåp
FI21255A (fi) Fjäderbotten
FI21179A (fi) Hjulsats
FI20839A (fi) Insektutrotningsmedel
FI22606A (fi) Byggnadsblock