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GB494293A - Improvements in or relating to telephone transmitters - Google Patents

Improvements in or relating to telephone transmitters

Info

Publication number
GB494293A
GB494293A GB11126/37A GB1112637A GB494293A GB 494293 A GB494293 A GB 494293A GB 11126/37 A GB11126/37 A GB 11126/37A GB 1112637 A GB1112637 A GB 1112637A GB 494293 A GB494293 A GB 494293A
Authority
GB
United Kingdom
Prior art keywords
holes
diaphragm
casing
inch
hole
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
GB11126/37A
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.)
STANDARD TELPHONES AND CABLES
Original Assignee
STANDARD TELPHONES AND CABLES
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 TELPHONES AND CABLES filed Critical STANDARD TELPHONES AND CABLES
Priority to GB11126/37A priority Critical patent/GB494293A/en
Priority to GB29835/38A priority patent/GB513352A/en
Priority to DEI3312D priority patent/DE898763C/en
Publication of GB494293A publication Critical patent/GB494293A/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
    • 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)
  • Measuring Fluid Pressure (AREA)

Abstract

494,293. Transmitters. STANDARD TELEPHONES & CABLES, Ltd., POCOCK, L. C., and LEMAN, H. S. April 19, 1937, No. 11126. [Class 40 (iv)] In a telephone transmitter of the carbongranule type comprising an air chamber enclosed between a light diaphragm and the casing of the transmitter and one or more holes in the casing whereby the air chamber is in communication with the outer air, the dimensions of the chamber and the hole or holes are so chosen that an anti-resonance is produced at a frequency approximately equal to the resonance frequency of the diaphragm and the said air chamber without the said hole or holes, and the hole or holes in the casing are covered with acoustic attenuating material. The dome-shaped electrode 3 is connected to a diaphragm 2 clamped between a ring 15 and the casing 1 by a spun-over cover 12. A metal spider 4 and a silk washer 5 are clamped to a porcelain member 6 on which is mounted a graphite electrode 7 held in position by an insulating ring 9 and a cover 10. The filling hole 19 for the granule chamber is covered by a metal cap 11. The space 20 at the back of the diaphragm, which is less than usual and has a volume of 0À095 cubic inch or less, communicates with the outer air by one or more holes 13 covered by discs 14 of acoustic resistance material, such as heavy silk. The space in front of the diaphragm and the openings in the cover plate 12 may be designed and dimensioned in a manner similar to that described in Specification 481,740. The diaphragm has a thickness of approximately 0À003 inch and the holes 13 are preferably of diameter 0À152 inch and have a depth of 0À040 inch. Specification 435,130 also is referred to.
GB11126/37A 1937-04-19 1937-04-19 Improvements in or relating to telephone transmitters Expired GB494293A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB11126/37A GB494293A (en) 1937-04-19 1937-04-19 Improvements in or relating to telephone transmitters
GB29835/38A GB513352A (en) 1937-04-19 1938-03-23 Improvements in or relating to telephone transmitters
DEI3312D DE898763C (en) 1937-04-19 1938-04-20 Carbon core microphone

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB11126/37A GB494293A (en) 1937-04-19 1937-04-19 Improvements in or relating to telephone transmitters
GB29835/38A GB513352A (en) 1937-04-19 1938-03-23 Improvements in or relating to telephone transmitters

Publications (1)

Publication Number Publication Date
GB494293A true GB494293A (en) 1938-10-19

Family

ID=26248083

Family Applications (2)

Application Number Title Priority Date Filing Date
GB11126/37A Expired GB494293A (en) 1937-04-19 1937-04-19 Improvements in or relating to telephone transmitters
GB29835/38A Expired GB513352A (en) 1937-04-19 1938-03-23 Improvements in or relating to telephone transmitters

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB29835/38A Expired GB513352A (en) 1937-04-19 1938-03-23 Improvements in or relating to telephone transmitters

Country Status (1)

Country Link
GB (2) GB494293A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE740642C (en) * 1941-01-25 1943-10-25 Kabelindustrie Ag Capsule microphone with a capsule housing made of insulating material
US2483317A (en) * 1944-01-27 1949-09-27 Laurent Charles Carbon type microphone
US2540498A (en) * 1949-03-18 1951-02-06 Bell Telephone Labor Inc Microphone damping system having rear openings
US2603724A (en) * 1948-10-30 1952-07-15 Rca Corp Sound translating device arranged to eliminate extraneous sound
DE976947C (en) * 1952-06-25 1964-09-17 Standard Elek K Lorenz Ag Resilient clamping of the membrane of a speech or ear capsule

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE968712C (en) * 1951-10-17 1958-03-20 Gasaccumulator Svenska Ab Touch microphone

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE740642C (en) * 1941-01-25 1943-10-25 Kabelindustrie Ag Capsule microphone with a capsule housing made of insulating material
US2483317A (en) * 1944-01-27 1949-09-27 Laurent Charles Carbon type microphone
US2603724A (en) * 1948-10-30 1952-07-15 Rca Corp Sound translating device arranged to eliminate extraneous sound
US2540498A (en) * 1949-03-18 1951-02-06 Bell Telephone Labor Inc Microphone damping system having rear openings
DE976947C (en) * 1952-06-25 1964-09-17 Standard Elek K Lorenz Ag Resilient clamping of the membrane of a speech or ear capsule

Also Published As

Publication number Publication date
GB513352A (en) 1939-10-10

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