EP0232096A3 - Acoustic transducers - Google Patents

Acoustic transducers

Info

Publication number
EP0232096A3
EP0232096A3 EP87300610A EP87300610A EP0232096A3 EP 0232096 A3 EP0232096 A3 EP 0232096A3 EP 87300610 A EP87300610 A EP 87300610A EP 87300610 A EP87300610 A EP 87300610A EP 0232096 A3 EP0232096 A3 EP 0232096A3
Authority
EP
European Patent Office
Prior art keywords
vent
transducer
housing
drive unit
acoustic transducers
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.)
Granted
Application number
EP87300610A
Other versions
EP0232096A2 (en
EP0232096B1 (en
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
Plessey Overseas 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 Plessey Overseas Ltd filed Critical Plessey Overseas Ltd
Priority to AT87300610T priority Critical patent/ATE70936T1/en
Publication of EP0232096A2 publication Critical patent/EP0232096A2/en
Publication of EP0232096A3 publication Critical patent/EP0232096A3/en
Application granted granted Critical
Publication of EP0232096B1 publication Critical patent/EP0232096B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)
  • Helmets And Other Head Coverings (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)

Abstract

An acoustic transducer, such as a headphone 2, comprises a housing with a vent 16 for venting fluid medium from the housing. The vent is dimensioned to ensure that laminar flow of the fluid medium through the vent 16 is maintained throughout the working range of the drive unit 14 of the transducer so that the amplitude response and phase response of the transducer are substantially invariant throughout the working range of the drive unit 14.
EP87300610A 1986-01-23 1987-01-23 Acoustic transducers Expired - Lifetime EP0232096B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87300610T ATE70936T1 (en) 1986-01-23 1987-01-23 ACOUSTIC TRANSDUCER.

Applications Claiming Priority (2)

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

Publications (3)

Publication Number Publication Date
EP0232096A2 EP0232096A2 (en) 1987-08-12
EP0232096A3 true EP0232096A3 (en) 1988-10-05
EP0232096B1 EP0232096B1 (en) 1991-12-27

Family

ID=10591825

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87300610A Expired - Lifetime EP0232096B1 (en) 1986-01-23 1987-01-23 Acoustic transducers

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

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB819146A (en) * 1956-11-26 1959-08-26 Standard Telephones Cables Ltd Improvements in or relating to acoustic impedance devices
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.
AT337795B (en) * 1975-10-13 1977-07-25 Akg Akustische Kino Geraete HEADPHONE
US4071717A (en) * 1975-04-08 1978-01-31 Akg Akustische U. Kino-Gerate Gesellschaft M.B.H. Headphone earpiece
EP0064553A1 (en) * 1980-10-31 1982-11-17 Sony Corporation Electro-acoustic transducers

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB819146A (en) * 1956-11-26 1959-08-26 Standard Telephones Cables Ltd Improvements in or relating to acoustic impedance devices
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.
US4071717A (en) * 1975-04-08 1978-01-31 Akg Akustische U. Kino-Gerate Gesellschaft M.B.H. Headphone earpiece
AT337795B (en) * 1975-10-13 1977-07-25 Akg Akustische Kino Geraete HEADPHONE
EP0064553A1 (en) * 1980-10-31 1982-11-17 Sony Corporation Electro-acoustic transducers

Also Published As

Publication number Publication date
ATE70936T1 (en) 1992-01-15
EP0232096A2 (en) 1987-08-12
DE3775425D1 (en) 1992-02-06
EP0232096B1 (en) 1991-12-27
GR3003764T3 (en) 1993-03-16
GB8701520D0 (en) 1987-02-25
ES2028062T3 (en) 1992-07-01

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