GB227173A - Improvements in and relating to apparatus for converting sound waves into variationsof electric current - Google Patents

Improvements in and relating to apparatus for converting sound waves into variationsof electric current

Info

Publication number
GB227173A
GB227173A GB2499123A GB2499123A GB227173A GB 227173 A GB227173 A GB 227173A GB 2499123 A GB2499123 A GB 2499123A GB 2499123 A GB2499123 A GB 2499123A GB 227173 A GB227173 A GB 227173A
Authority
GB
United Kingdom
Prior art keywords
aperture
sound waves
variationsof
relating
electric current
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
GB2499123A
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
Application filed by Individual filed Critical Individual
Publication of GB227173A publication Critical patent/GB227173A/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
    • H04R23/00—Transducers other than those covered by groups H04R9/00 - H04R21/00
    • H04R23/002—Transducers other than those covered by groups H04R9/00 - H04R21/00 using electrothermic-effect transducer

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Photoreceptors In Electrophotography (AREA)
  • Glass Compositions (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)

Abstract

227,173. Case, T. W. Oct. 8, 1923. Microphones.-Relates to a hot-wire microphone of the kind in which the electrically heated resistance wire is mounted within an aperture in a wall of a chamber and is subjected to the action of sound waves as they pass through the aperture and to a current of air or gas produced for example by a blower 10 to cool the resistance. The invention consists in the provision of an auxiliary aperture or apertures or a sheet of fabric 11 at the back of the casing 1 to allow the escape of gas independently of the aperture 2 in which the hot wire 3 is mounted. The aperture 2 may be of any shape, and may be adjustable in size by means of slides 25, 26, Fig. 4, or in any known manner. The electrical variations may be translated, as desired, by means of a transformer 5, 6 and telephone receivers 7.
GB2499123A 1924-02-11 1923-10-08 Improvements in and relating to apparatus for converting sound waves into variationsof electric current Expired GB227173A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB348524A GB233763A (en) 1924-02-11 1924-02-11 Improvements in microphones

Publications (1)

Publication Number Publication Date
GB227173A true GB227173A (en) 1925-01-08

Family

ID=9759203

Family Applications (2)

Application Number Title Priority Date Filing Date
GB2499123A Expired GB227173A (en) 1924-02-11 1923-10-08 Improvements in and relating to apparatus for converting sound waves into variationsof electric current
GB348524A Expired GB233763A (en) 1923-09-27 1924-02-11 Improvements in microphones

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB348524A Expired GB233763A (en) 1923-09-27 1924-02-11 Improvements in microphones

Country Status (2)

Country Link
FR (1) FR572044A (en)
GB (2) GB227173A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2346757A (en) * 1984-09-12 2000-08-16 Raytheon Co Pyroelectric transducer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2346757A (en) * 1984-09-12 2000-08-16 Raytheon Co Pyroelectric transducer
GB2346757B (en) * 1984-09-12 2001-02-21 Raytheon Co Transducer

Also Published As

Publication number Publication date
GB233763A (en) 1925-05-11
FR572044A (en) 1924-05-28

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