DE3775425D1 - ACOUSTIC CONVERTER. - Google Patents

ACOUSTIC CONVERTER.

Info

Publication number
DE3775425D1
DE3775425D1 DE8787300610T DE3775425T DE3775425D1 DE 3775425 D1 DE3775425 D1 DE 3775425D1 DE 8787300610 T DE8787300610 T DE 8787300610T DE 3775425 T DE3775425 T DE 3775425T DE 3775425 D1 DE3775425 D1 DE 3775425D1
Authority
DE
Germany
Prior art keywords
drive unit
fluid medium
vent
working range
cavities
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 - Fee Related
Application number
DE8787300610T
Other languages
German (de)
Inventor
Anthony John Salloway
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.)
BAE Systems Defence Systems Ltd
Original Assignee
Siemens Plessey Electronic Systems 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 Siemens Plessey Electronic Systems Ltd filed Critical Siemens Plessey Electronic Systems Ltd
Application granted granted Critical
Publication of DE3775425D1 publication Critical patent/DE3775425D1/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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 
    • 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 
    • H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H04R1/2807—Enclosures comprising vibrating or resonating arrangements
    • H04R1/2838—Enclosures comprising vibrating or resonating arrangements of the bandpass type
    • H04R1/2846—Vents, i.e. ports, e.g. shape thereof or tuning thereof with damping material
    • H04R1/2849—Vents, i.e. ports, e.g. shape thereof or tuning thereof with damping material for loudspeaker transducers
    • 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
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1008—Earpieces of the supra-aural or circum-aural type

Landscapes

  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Headphones And Earphones (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Helmets And Other Head Coverings (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)

Abstract

The acoustic transducer comprises a housing defining a cavity containing the fluid medium, a drive unit and a vent providing a leak path, for venting the fluid medium from the cavity. The vent is dimensioned for maintaining a laminar flow of the fluid medium through the vent throughout the working range of the drive unit. The amplitude response shape and the phase response of the transducer are invariant throughout the working range of the drive unit. The housing defines two cavities containing the fluid medium and the drive unit is mounted on a wall common to both cavities.
DE8787300610T 1986-01-23 1987-01-23 ACOUSTIC CONVERTER. Expired - Fee Related DE3775425D1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8601635 1986-01-23

Publications (1)

Publication Number Publication Date
DE3775425D1 true DE3775425D1 (en) 1992-02-06

Family

ID=10591825

Family Applications (1)

Application Number Title Priority Date Filing Date
DE8787300610T Expired - Fee Related DE3775425D1 (en) 1986-01-23 1987-01-23 ACOUSTIC CONVERTER.

Country Status (6)

Country Link
EP (1) EP0232096B1 (en)
AT (1) ATE70936T1 (en)
DE (1) DE3775425D1 (en)
ES (1) ES2028062T3 (en)
GB (1) GB8701520D0 (en)
GR (1) GR3003764T3 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW356629B (en) * 1996-11-28 1999-04-21 Kirk Acoustics As Telephone handset, cordless telephone or mobile telephone
US7317802B2 (en) * 2000-07-25 2008-01-08 Lightspeed Aviation, Inc. Active-noise-reduction headsets with front-cavity venting
WO2003010993A2 (en) * 2001-07-25 2003-02-06 Michael Jon Wurtz Active-noise-reduction headsets with front-cavity venting
KR100480052B1 (en) * 2002-06-28 2005-03-30 엘지전자 주식회사 Receiver unit of terminal device
US9762990B2 (en) 2013-03-26 2017-09-12 Bose Corporation Headset porting

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE562680A (en) * 1956-11-26
US3602329A (en) * 1970-01-07 1971-08-31 Columbia Broadcasting Systems Conformal ear enclosure
CH558121A (en) * 1973-07-19 1975-01-15 Peiker Heinrich DYNAMIC SMALL SPEAKER FOR VOICE TRANSMISSION.
AT334992B (en) * 1975-04-08 1977-02-10 Akg Akustische Kino Geraete SCALP
AT337795B (en) * 1975-10-13 1977-07-25 Akg Akustische Kino Geraete HEADPHONE
CA1165248A (en) * 1980-10-31 1984-04-10 Shingo Watanabe Electro-acoustic transducer

Also Published As

Publication number Publication date
ES2028062T3 (en) 1992-07-01
GB8701520D0 (en) 1987-02-25
ATE70936T1 (en) 1992-01-15
EP0232096B1 (en) 1991-12-27
GR3003764T3 (en) 1993-03-16
EP0232096A3 (en) 1988-10-05
EP0232096A2 (en) 1987-08-12

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8327 Change in the person/name/address of the patent owner

Owner name: BAE SYSTEMS (DEFENCE SYSTEMS) LTD., FARNBOROUGH, H

8339 Ceased/non-payment of the annual fee