GB246351A - Shielding microphones and associated amplifier apparatus - Google Patents

Shielding microphones and associated amplifier apparatus

Info

Publication number
GB246351A
GB246351A GB894825A GB894825A GB246351A GB 246351 A GB246351 A GB 246351A GB 894825 A GB894825 A GB 894825A GB 894825 A GB894825 A GB 894825A GB 246351 A GB246351 A GB 246351A
Authority
GB
United Kingdom
Prior art keywords
microphones
screen
amplifier apparatus
shielding
forest
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
GB894825A
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.)
Individual
Original Assignee
Individual
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
Priority to US635337A priority Critical patent/US1693072A/en
Application filed by Individual filed Critical Individual
Priority to GB894825A priority patent/GB246351A/en
Publication of GB246351A publication Critical patent/GB246351A/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
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/40—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers
    • H04R1/406—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers microphones

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Abstract

246,351. De Forest Phonofilms, Ltd., (Forest, L. de). April 3, 1925. Instrument and leads shielded by metallic screen.-Microphones 1, 2 of any type are shielded from electromagnetic or electrostatic disturbances by an open mesh metal screen 3 which allows sound waves to penetrate. The leads to the amplifier apparatus 5 are encased in a metallic sheath 4 connected to the mesh 3 and to a metal screen 6 surrounding the amplifier, the whole being grounded. An open mesh screen 3 may be applied to several microphones in different parts of the room.
GB894825A 1923-04-28 1925-04-03 Shielding microphones and associated amplifier apparatus Expired GB246351A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US635337A US1693072A (en) 1923-04-28 1923-04-28 Means for shielding sound detector and amplifier apparatus
GB894825A GB246351A (en) 1925-04-03 1925-04-03 Shielding microphones and associated amplifier apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB894825A GB246351A (en) 1925-04-03 1925-04-03 Shielding microphones and associated amplifier apparatus

Publications (1)

Publication Number Publication Date
GB246351A true GB246351A (en) 1926-01-28

Family

ID=9862410

Family Applications (1)

Application Number Title Priority Date Filing Date
GB894825A Expired GB246351A (en) 1923-04-28 1925-04-03 Shielding microphones and associated amplifier apparatus

Country Status (1)

Country Link
GB (1) GB246351A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1217870A1 (en) * 1999-09-30 2002-06-26 Matsushita Electric Industrial Co., Ltd. Microphone and video camera

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1217870A1 (en) * 1999-09-30 2002-06-26 Matsushita Electric Industrial Co., Ltd. Microphone and video camera
EP1217870A4 (en) * 1999-09-30 2006-10-18 Matsushita Electric Ind Co Ltd Microphone and video camera

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