GB356273A - Improvements in and relating to telephone transformers - Google Patents

Improvements in and relating to telephone transformers

Info

Publication number
GB356273A
GB356273A GB1764630A GB1764630A GB356273A GB 356273 A GB356273 A GB 356273A GB 1764630 A GB1764630 A GB 1764630A GB 1764630 A GB1764630 A GB 1764630A GB 356273 A GB356273 A GB 356273A
Authority
GB
United Kingdom
Prior art keywords
microphones
primary windings
transformers
telephone
relating
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
GB1764630A
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.)
ALAN D ARCY HODGSON
GRAHAM AMPLION Ltd
Original Assignee
ALAN D ARCY HODGSON
GRAHAM AMPLION Ltd
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 ALAN D ARCY HODGSON, GRAHAM AMPLION Ltd filed Critical ALAN D ARCY HODGSON
Priority to GB1764630A priority Critical patent/GB356273A/en
Publication of GB356273A publication Critical patent/GB356273A/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
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/005—Circuits for transducers, loudspeakers or microphones for combining the signals of two or more microphones

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Transmitters (AREA)

Abstract

356,273. Microphone circuits. GRAHAM AMPLION, Ltd. and HODGSON, A. D'A., St. Andrew's Works, Slough. June 6, 1930, No. 17646. [Class 40 (iv).] A coupling transformer for two microphones 16, 17 which may be used alternatively has its primary windings 13, 14 wound in opposite directions so that the steady component of microphone current produces no magnetic effect. More than two microphones may be provided for by balancing one or more of the primary windings against the remainder. The transformer may be provided with a tertiary winding connected to a local receiver. The apparatus is particularly applicable to wireless equipment on aircraft.
GB1764630A 1930-06-06 1930-06-06 Improvements in and relating to telephone transformers Expired GB356273A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1764630A GB356273A (en) 1930-06-06 1930-06-06 Improvements in and relating to telephone transformers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1764630A GB356273A (en) 1930-06-06 1930-06-06 Improvements in and relating to telephone transformers

Publications (1)

Publication Number Publication Date
GB356273A true GB356273A (en) 1931-09-07

Family

ID=10098781

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1764630A Expired GB356273A (en) 1930-06-06 1930-06-06 Improvements in and relating to telephone transformers

Country Status (1)

Country Link
GB (1) GB356273A (en)

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