WO2001087004A3 - A loudspeaker incorporating an electromagnetic screen - Google Patents

A loudspeaker incorporating an electromagnetic screen Download PDF

Info

Publication number
WO2001087004A3
WO2001087004A3 PCT/GB2001/002127 GB0102127W WO0187004A3 WO 2001087004 A3 WO2001087004 A3 WO 2001087004A3 GB 0102127 W GB0102127 W GB 0102127W WO 0187004 A3 WO0187004 A3 WO 0187004A3
Authority
WO
WIPO (PCT)
Prior art keywords
loudspeaker
electromagnetic screen
loudspeaker incorporating
amplifier
incorporating
Prior art date
Application number
PCT/GB2001/002127
Other languages
French (fr)
Other versions
WO2001087004A2 (en
Inventor
Duncan Grant
Original Assignee
Univ Bristol
Duncan Grant
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 Univ Bristol, Duncan Grant filed Critical Univ Bristol
Priority to AU2001256500A priority Critical patent/AU2001256500A1/en
Publication of WO2001087004A2 publication Critical patent/WO2001087004A2/en
Publication of WO2001087004A3 publication Critical patent/WO2001087004A3/en

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
    • H03F3/217—Class D power amplifiers; Switching amplifiers
    • 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
    • H04R1/005—Details of transducers, loudspeakers or microphones using digitally weighted transducing elements

Landscapes

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

Abstract

A loudspeaker is provided which has an integrally formed electromagnetic screen (66, 68) or a narrow passage (61) which attenuates radiation passing therethrough. Such a loudspeaker can be driven directly from a switched mode amplifier such as a class D amplifier. This enables a reasonable audio level to be achieved from a low supply voltage.
PCT/GB2001/002127 2000-05-12 2001-05-11 A loudspeaker incorporating an electromagnetic screen WO2001087004A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001256500A AU2001256500A1 (en) 2000-05-12 2001-05-11 A loudspeaker incorporating an electromagnetic screen and optionally an integralamplifier

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0011554.3 2000-05-12
GB0011554A GB0011554D0 (en) 2000-05-12 2000-05-12 A loudspeaker incorporating an electromagnetic screen and optionally an integral amplifier

Publications (2)

Publication Number Publication Date
WO2001087004A2 WO2001087004A2 (en) 2001-11-15
WO2001087004A3 true WO2001087004A3 (en) 2002-04-04

Family

ID=9891528

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2001/002127 WO2001087004A2 (en) 2000-05-12 2001-05-11 A loudspeaker incorporating an electromagnetic screen

Country Status (3)

Country Link
AU (1) AU2001256500A1 (en)
GB (1) GB0011554D0 (en)
WO (1) WO2001087004A2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2396512B (en) * 2002-12-19 2006-08-02 Ultra Electronics Ltd Noise attenuation system for vehicles
CN113709638B (en) * 2021-08-31 2023-08-01 安徽井利电子有限公司 Anti-electromagnetic interference loudspeaker system and anti-interference method thereof

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4465906A (en) * 1981-12-17 1984-08-14 Magnetfabrik Bonn Gmbh Vormals Gewerkschaft Windhorst Low-leakage pot magnet system for moving-coil loudspeakers
JPS6157199A (en) * 1984-08-29 1986-03-24 Matsushita Electric Ind Co Ltd Anti-magnetic device of speaker
EP0809415A2 (en) * 1996-05-22 1997-11-26 BECKER GmbH Loudspeaker

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4465906A (en) * 1981-12-17 1984-08-14 Magnetfabrik Bonn Gmbh Vormals Gewerkschaft Windhorst Low-leakage pot magnet system for moving-coil loudspeakers
JPS6157199A (en) * 1984-08-29 1986-03-24 Matsushita Electric Ind Co Ltd Anti-magnetic device of speaker
EP0809415A2 (en) * 1996-05-22 1997-11-26 BECKER GmbH Loudspeaker

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 010, no. 221 (E - 424) 2 August 1986 (1986-08-02) *

Also Published As

Publication number Publication date
AU2001256500A1 (en) 2001-11-20
GB0011554D0 (en) 2000-06-28
WO2001087004A2 (en) 2001-11-15

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