GB641651A - Improvements in or relating to loudspeakers or microphones - Google Patents

Improvements in or relating to loudspeakers or microphones

Info

Publication number
GB641651A
GB641651A GB953047A GB953047A GB641651A GB 641651 A GB641651 A GB 641651A GB 953047 A GB953047 A GB 953047A GB 953047 A GB953047 A GB 953047A GB 641651 A GB641651 A GB 641651A
Authority
GB
United Kingdom
Prior art keywords
voice coil
diaphragm
secondary voice
gap
annular
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
GB953047A
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.)
CECIL THOMAS CHAPMAN
GOODMANS IND Ltd
Original Assignee
CECIL THOMAS CHAPMAN
GOODMANS IND 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 CECIL THOMAS CHAPMAN, GOODMANS IND Ltd filed Critical CECIL THOMAS CHAPMAN
Priority to GB953047A priority Critical patent/GB641651A/en
Publication of GB641651A publication Critical patent/GB641651A/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 
    • H04R1/24—Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Abstract

641,651. Electromagnetic transducers. CHAPMAN, C. T., and GOODMANS INDUSTRIES, Ltd. April 10, 1947, No. 9530. [Class 40 (iv)] In a loudspeaker, a diaphragm 5 carries an annular primary voice coil 1 surrounding a concentric secondary voice coil 2 mounted on a smaller free edge diaphragm 11 intended to reproduce the higher frequencies. The voice coils 1, 2 are disposed in an annular magnetic gap 3 of a magnet 4 and are independently mounted for axial movement within the gap. The secondary voice coil 2 may be shortcircuited, or preferably it is closed through an external circuit comprising a fixed or variable resistance 12, inductance, capacitance or combination thereof. The currents induced in the secondary voice coil may be fed back to the amplifier feeding the primary voice coil. In modifications, the secondary voice coil may carry a cap or dome diaphragm, a horn may be used, and the magnetic structure may be slotted or laminated. The devicemay be used in reverse as a microphone. Specification 469,194 is referred to.
GB953047A 1947-04-10 1947-04-10 Improvements in or relating to loudspeakers or microphones Expired GB641651A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB953047A GB641651A (en) 1947-04-10 1947-04-10 Improvements in or relating to loudspeakers or microphones

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB953047A GB641651A (en) 1947-04-10 1947-04-10 Improvements in or relating to loudspeakers or microphones

Publications (1)

Publication Number Publication Date
GB641651A true GB641651A (en) 1950-08-16

Family

ID=9873776

Family Applications (1)

Application Number Title Priority Date Filing Date
GB953047A Expired GB641651A (en) 1947-04-10 1947-04-10 Improvements in or relating to loudspeakers or microphones

Country Status (1)

Country Link
GB (1) GB641651A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3983337A (en) * 1973-06-21 1976-09-28 Babbco, Ltd. Broad-band acoustic speaker
US4492826A (en) * 1982-08-10 1985-01-08 R&C Chiu International, Inc. Loudspeaker
GB2261135A (en) * 1991-11-02 1993-05-05 Meir Mordechai A loudspeaker

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3983337A (en) * 1973-06-21 1976-09-28 Babbco, Ltd. Broad-band acoustic speaker
US4492826A (en) * 1982-08-10 1985-01-08 R&C Chiu International, Inc. Loudspeaker
GB2261135A (en) * 1991-11-02 1993-05-05 Meir Mordechai A loudspeaker

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