GB611209A - Improvements in or relating to microphones - Google Patents

Improvements in or relating to microphones

Info

Publication number
GB611209A
GB611209A GB16408/44A GB1640844A GB611209A GB 611209 A GB611209 A GB 611209A GB 16408/44 A GB16408/44 A GB 16408/44A GB 1640844 A GB1640844 A GB 1640844A GB 611209 A GB611209 A GB 611209A
Authority
GB
United Kingdom
Prior art keywords
microphone
ribbon
moving
permanent magnets
output
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
GB16408/44A
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
Priority to GB16408/44A priority Critical patent/GB611209A/en
Priority to US611408A priority patent/US2527540A/en
Priority to FR939127D priority patent/FR939127A/en
Publication of GB611209A publication Critical patent/GB611209A/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
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/08—Microphones

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Abstract

611,209. Microphones. STANDARD TELEPHONES & CABLES, Ltd., and GAYFORD, M. L. Aug. 29,1944, No. 16408. [Class 40 (iv)] In a compound microphone comprising a microphone of the velocity or pressure-gradient type and a microphone of the pressure type, the first-named microphone has two permanent magnets co-operating with polepieces having edges adjacent to the vibrating. member of the first microphone and the second-named microphone is located between the two permanent magnets of the first microphone. The ribbon 11 of the velocity microphone is located in a horizontal gap formed between parallel portions 9, 10 of V-shaped polepieces 5, 6 secured by bolts 8 to non-symmetrical U-shaped magnets 3, 4 joined at the rear by a tie-rod 7. The permanent magnets are recessed to accommodate the spherical casing of a moving-coil microphone 1 which may be as shown and described in Specification 570,337, the diaphragm 14 being located as near as possible to the ribbon 11. Polar response curves for the compound microphone in respect of frequencies up to 9000 cycles per second are indicated by the curves of Fig. 4 (not shown) and were obtained by connecting the moving-ribbon output to a step-up transformer of which the output was connected in series with the output of the moving-coil microphone. Specification 530,483 also is referred to.
GB16408/44A 1944-08-29 1944-08-29 Improvements in or relating to microphones Expired GB611209A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB16408/44A GB611209A (en) 1944-08-29 1944-08-29 Improvements in or relating to microphones
US611408A US2527540A (en) 1944-08-29 1945-08-18 Unidirectional dual microphone
FR939127D FR939127A (en) 1944-08-29 1946-04-04 Microphones

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB16408/44A GB611209A (en) 1944-08-29 1944-08-29 Improvements in or relating to microphones

Publications (1)

Publication Number Publication Date
GB611209A true GB611209A (en) 1948-10-27

Family

ID=10076781

Family Applications (1)

Application Number Title Priority Date Filing Date
GB16408/44A Expired GB611209A (en) 1944-08-29 1944-08-29 Improvements in or relating to microphones

Country Status (3)

Country Link
US (1) US2527540A (en)
FR (1) FR939127A (en)
GB (1) GB611209A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5692060A (en) * 1995-05-01 1997-11-25 Knowles Electronics, Inc. Unidirectional microphone

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE396402A (en) * 1931-03-31
US2141420A (en) * 1936-07-28 1938-12-27 Bell Telephone Labor Inc Acoustic device
US2093664A (en) * 1936-07-30 1937-09-21 Bell Telephone Labor Inc Acoustic device
US2227580A (en) * 1938-06-30 1941-01-07 Bell Telephone Labor Inc Acoustic device

Also Published As

Publication number Publication date
US2527540A (en) 1950-10-31
FR939127A (en) 1948-11-04

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