DK572177A - Hoerelsesbeskytter med kommunikationsmulighed - Google Patents

Hoerelsesbeskytter med kommunikationsmulighed

Info

Publication number
DK572177A
DK572177A DK572177A DK572177A DK572177A DK 572177 A DK572177 A DK 572177A DK 572177 A DK572177 A DK 572177A DK 572177 A DK572177 A DK 572177A DK 572177 A DK572177 A DK 572177A
Authority
DK
Denmark
Prior art keywords
hearing protector
communication opportunity
opportunity
communication
hearing
Prior art date
Application number
DK572177A
Other languages
Danish (da)
English (en)
Inventor
L A T Persson
T R Lundin
Original Assignee
Gullfiber Ab
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 Gullfiber Ab filed Critical Gullfiber Ab
Publication of DK572177A publication Critical patent/DK572177A/da

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
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1083—Reduction of ambient noise
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G11/00—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general
    • H03G11/02—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general by means of diodes
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/02—Manually-operated control
    • H03G3/04—Manually-operated control in untuned amplifiers
    • 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
    • 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

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Headphones And Earphones (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Stereophonic Arrangements (AREA)
  • Amplifiers (AREA)
DK572177A 1976-12-22 1977-12-21 Hoerelsesbeskytter med kommunikationsmulighed DK572177A (da)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7614482A SE410695B (sv) 1976-12-22 1976-12-22 Horselskydd med hortelefoner

Publications (1)

Publication Number Publication Date
DK572177A true DK572177A (da) 1978-06-23

Family

ID=20329827

Family Applications (1)

Application Number Title Priority Date Filing Date
DK572177A DK572177A (da) 1976-12-22 1977-12-21 Hoerelsesbeskytter med kommunikationsmulighed

Country Status (10)

Country Link
US (1) US4224470A (nl)
AT (1) AT374315B (nl)
CA (1) CA1085742A (nl)
DE (1) DE2756159B2 (nl)
DK (1) DK572177A (nl)
FI (1) FI773663A (nl)
FR (1) FR2375785A1 (nl)
GB (1) GB1593997A (nl)
NL (1) NL7714131A (nl)
SE (1) SE410695B (nl)

Families Citing this family (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2152785B (en) * 1982-05-28 1986-02-26 British Broadcasting Corp Headphone level protection circuit
GB2120903B (en) * 1982-05-28 1986-02-26 British Broadcasting Corp Headphone level protection circuit
US4479239A (en) * 1983-03-28 1984-10-23 Silver Creek Nurseries, Inc. Sound detecting device
DE3312801A1 (de) * 1983-04-09 1984-10-11 Diehl GmbH & Co, 8500 Nürnberg Verfahren zur steigerung der konzentrationsfaehigkeit und vorrichtung zum ausueben des verfahrens
US4538296A (en) * 1983-07-22 1985-08-27 Short Robert S Sound inhibitor for audio transducers
FR2551591B1 (fr) * 1983-08-31 1985-10-25 Radiotechnique Dispositif pour le reglage d'un signal delivre sur une prise pour fiche cylindrique, et appareil equipe d'un tel dispositif
US4677678A (en) * 1984-07-10 1987-06-30 The United States Of America As Represented By The Department Of Health And Human Services Active hearing protectors
US4928311A (en) * 1986-01-03 1990-05-22 Trompler Lyle D Noise limiting circuit for earmuffs
US4809336A (en) * 1987-03-23 1989-02-28 Pritchard Eric K Semiconductor amplifier with tube amplifier characteristics
US4944015A (en) * 1988-04-29 1990-07-24 Juve Ronald A Audio compression circuit for television audio signals
US5369711A (en) * 1990-08-31 1994-11-29 Bellsouth Corporation Automatic gain control for a headset
US5371803A (en) * 1990-08-31 1994-12-06 Bellsouth Corporation Tone reduction circuit for headsets
GB2279202B (en) * 1993-06-09 1997-05-21 Michael John Fogarty Electronic conversion for passive ear muffs
US5701352A (en) * 1994-07-14 1997-12-23 Bellsouth Corporation Tone suppression automatic gain control for a headset
EP1172981A3 (en) * 2000-07-10 2006-11-15 Broadcom Corporation Analogue front end for xDSL
US20030103633A1 (en) * 2001-11-01 2003-06-05 Metcalfe Thomas O. Kids ear saver headphone adapter
WO2003079722A1 (en) * 2002-03-20 2003-09-25 Sennheiser Communications A/S Active audio compressing in telecommunication
US20070230715A1 (en) * 2006-03-28 2007-10-04 Ingemi Corp. Audio limiting device for headphones
SE530105C2 (sv) 2006-07-12 2008-03-04 Peltor Ab Förfarande för begränsning av den maximalt tillåtna ljudvolymen i en hörlur samt hörlur för genomförande av förfarandet
SE532191C2 (sv) * 2007-05-07 2009-11-10 3M Svenska Ab Förfarande och anordning för dämpning av en ljudsignal
US8130980B2 (en) * 2007-06-21 2012-03-06 Creative Technology Ltd Automatic gain control circuit for volume control and corresponding method for volume control
US20100215198A1 (en) * 2009-02-23 2010-08-26 Ngia Lester S H Headset assembly with ambient sound control
GB2469269A (en) 2009-04-03 2010-10-13 Limitear Ltd A light emitting diode used as a limiter and high volume indicator for an audio transducer
US20120250881A1 (en) * 2011-03-29 2012-10-04 Mulligan Daniel P Microphone biasing
US9167340B2 (en) 2012-10-15 2015-10-20 Direct Sound Headphones, LLC Apparatus and methods for limiting sound volume
CN109922404B (zh) * 2017-07-31 2020-04-14 乐利精密工业(深圳)有限公司 一种头戴式耳机

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3306991A (en) * 1963-06-04 1967-02-28 Homer J Wood Protective hearing aid
US3959602A (en) * 1974-11-19 1976-05-25 Bell Telephone Laboratories, Incorporated Telephone substation circuit
NL174420C (nl) * 1975-06-30 1984-06-01 Philips Nv Beveiligingsinrichting voor een telefoontoestel.
JPS525204A (en) * 1975-07-01 1977-01-14 Seiko Epson Corp Hearing aid
US3991272A (en) * 1975-09-08 1976-11-09 Tarr Lloyd A Audio AGC amplifier
US4064362A (en) * 1976-09-13 1977-12-20 David Richard Williams Hearing protector

Also Published As

Publication number Publication date
DE2756159A1 (de) 1978-07-06
FR2375785A1 (fr) 1978-07-21
CA1085742A (en) 1980-09-16
NL7714131A (nl) 1978-06-26
GB1593997A (en) 1981-07-22
US4224470A (en) 1980-09-23
ATA900477A (de) 1983-08-15
AT374315B (de) 1984-04-10
DE2756159B2 (de) 1980-02-14
SE7614482L (sv) 1978-06-23
SE410695B (sv) 1979-10-22
FI773663A (fi) 1978-06-23

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Legal Events

Date Code Title Description
ATS Application withdrawn