GB513529A - Improvements in or relating to telephone transmitters - Google Patents

Improvements in or relating to telephone transmitters

Info

Publication number
GB513529A
GB513529A GB10565/38A GB1056538A GB513529A GB 513529 A GB513529 A GB 513529A GB 10565/38 A GB10565/38 A GB 10565/38A GB 1056538 A GB1056538 A GB 1056538A GB 513529 A GB513529 A GB 513529A
Authority
GB
United Kingdom
Prior art keywords
mouthpiece
sections
equivalent
values
designed
Prior art date
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
GB10565/38A
Other languages
English (en)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB513529A publication Critical patent/GB513529A/en
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)
GB10565/38A 1938-04-06 1938-04-06 Improvements in or relating to telephone transmitters Expired GB513529A (en)

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
GB513529A true GB513529A (en) 1939-10-16

Family

ID=10200725

Family Applications (5)

Application Number Title Priority Date Filing Date
GB10565/38A Expired GB513529A (en) 1938-04-06 1938-04-06 Improvements in or relating to telephone transmitters
GB7816/39A Expired GB513561A (en) 1938-04-06 1938-04-06 Improvements in or relating to telephone transmitters
GB7815/39A Expired GB526212A (en) 1938-04-06 1939-03-10 Improvements in or relating to telephone transmitters
GB21035/45A Expired GB594116A (en) 1938-04-06 1944-08-15 Improvements in or relating to microphones
GB1277/45A Expired GB593082A (en) 1938-04-06 1945-01-16 Improvements in and relating to sliding bolts for doors and otherwise

Family Applications After (4)

Application Number Title Priority Date Filing Date
GB7816/39A Expired GB513561A (en) 1938-04-06 1938-04-06 Improvements in or relating to telephone transmitters
GB7815/39A Expired GB526212A (en) 1938-04-06 1939-03-10 Improvements in or relating to telephone transmitters
GB21035/45A Expired GB594116A (en) 1938-04-06 1944-08-15 Improvements in or relating to microphones
GB1277/45A Expired GB593082A (en) 1938-04-06 1945-01-16 Improvements in and relating to sliding bolts for doors and otherwise

Country Status (4)

Country Link
BE (1) BE433695A (forum.php)
CH (1) CH237518A (forum.php)
FR (1) FR852567A (forum.php)
GB (5) GB513529A (forum.php)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1012641B (de) * 1954-04-27 1957-07-25 Akg Akustische Kino Geraete Anordnung an Schallwandlern zur Glaettung der Frequenzcharakteristik
DE1025452B (de) * 1952-09-18 1958-03-06 Standard Elektrik Ag Elektroakustischer Wandler mit Helmholzreseonator
DE1147631B (de) * 1960-08-16 1963-04-25 Sennheiser Electronic Elektroakustischer Wandler

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2758861A (en) * 1954-11-12 1956-08-14 Arthur N Molloy Bolt lock
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

Cited By (3)

* 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
DE1147631B (de) * 1960-08-16 1963-04-25 Sennheiser Electronic Elektroakustischer Wandler

Also Published As

Publication number Publication date
GB594116A (en) 1947-11-03
FR852567A (forum.php) 1940-03-01
GB526212A (en) 1940-09-12
GB593082A (en) 1947-10-08
GB513561A (en) 1939-10-16
CH237518A (fr) 1945-04-30
BE433695A (forum.php)

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