FR852567A - - Google Patents

Info

Publication number
FR852567A
FR852567A FR852567DA FR852567A FR 852567 A FR852567 A FR 852567A FR 852567D A FR852567D A FR 852567DA FR 852567 A FR852567 A FR 852567A
Authority
FR
France
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
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 date
Application granted granted Critical
Publication of FR852567A publication Critical patent/FR852567A/fr
Expired legal-status Critical Current

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
    • 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
    • H04R21/00—Variable-resistance transducers
    • H04R21/02—Microphones
    • H04R21/021—Microphones with granular resistance material

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Electric Double-Layer Capacitors Or The Like (AREA)
  • Specific Sealing Or Ventilating Devices For Doors And Windows (AREA)
  • Telephone Set Structure (AREA)
FR852567D 1938-04-06 Expired FR852567A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB237518X 1938-04-06

Publications (1)

Publication Number Publication Date
FR852567A true FR852567A (fr) 1940-03-01

Family

ID=10200725

Family Applications (1)

Application Number Title Priority Date Filing Date
FR852567D Expired FR852567A (fr) 1938-04-06

Country Status (4)

Country Link
BE (1) BE433695A (fr)
CH (1) CH237518A (fr)
FR (1) FR852567A (fr)
GB (5) GB513529A (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1025452B (de) * 1952-09-18 1958-03-06 Standard Elektrik Ag Elektroakustischer Wandler mit Helmholzreseonator
DE1012641B (de) * 1954-04-27 1957-07-25 Akg Akustische Kino Geraete Anordnung an Schallwandlern zur Glaettung der Frequenzcharakteristik
US2758861A (en) * 1954-11-12 1956-08-14 Arthur N Molloy Bolt lock
DE1147631B (de) * 1960-08-16 1963-04-25 Sennheiser Electronic Elektroakustischer Wandler
US4205206A (en) * 1975-10-31 1980-05-27 Iwatsu Electric Co. Ltd. Carbon granule microphone with molded resin-conductive carbon electrode
GB2203480A (en) * 1987-04-15 1988-10-19 Leslie Thomas Isaac Sliding bolt assembly

Also Published As

Publication number Publication date
GB513561A (en) 1939-10-16
BE433695A (fr)
GB526212A (en) 1940-09-12
GB593082A (en) 1947-10-08
GB594116A (en) 1947-11-03
CH237518A (fr) 1945-04-30
GB513529A (en) 1939-10-16

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