CH237518A - Mouthpiece for telephone microphones. - Google Patents

Mouthpiece for telephone microphones.

Info

Publication number
CH237518A
CH237518A CH237518DA CH237518A CH 237518 A CH237518 A CH 237518A CH 237518D A CH237518D A CH 237518DA CH 237518 A CH237518 A CH 237518A
Authority
CH
Switzerland
Prior art keywords
mouthpiece
telephone microphones
microphones
telephone
Prior art date
Application number
Other languages
French (fr)
Inventor
Bell Telephone Manufac Anonyme
Original Assignee
Bell Telephone Mfg
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 by Bell Telephone Mfg filed Critical Bell Telephone Mfg
Publication of CH237518A publication Critical patent/CH237518A/en

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)
CH237518D 1938-04-06 1939-04-06 Mouthpiece for telephone microphones. CH237518A (en)

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
CH237518A true CH237518A (en) 1945-04-30

Family

ID=10200725

Family Applications (1)

Application Number Title Priority Date Filing Date
CH237518D CH237518A (en) 1938-04-06 1939-04-06 Mouthpiece for telephone microphones.

Country Status (4)

Country Link
BE (1) BE433695A (en)
CH (1) CH237518A (en)
FR (1) FR852567A (en)
GB (5) GB513561A (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1025452B (en) * 1952-09-18 1958-03-06 Standard Elektrik Ag Electro-acoustic converter with Helmholz resonator
DE1012641B (en) * 1954-04-27 1957-07-25 Akg Akustische Kino Geraete Arrangement at sound transducers to smooth the frequency characteristics
US2758861A (en) * 1954-11-12 1956-08-14 Arthur N Molloy Bolt lock
DE1147631B (en) * 1960-08-16 1963-04-25 Sennheiser Electronic Electroacoustic converter
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
GB526212A (en) 1940-09-12
GB513529A (en) 1939-10-16
GB593082A (en) 1947-10-08
BE433695A (en)
GB513561A (en) 1939-10-16
FR852567A (en) 1940-03-01
GB594116A (en) 1947-11-03

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