DK491677A - Forstaerkerkobling for akustiske signaler med midler til undertrykkelse af uoenskede fejlsignaler - Google Patents

Forstaerkerkobling for akustiske signaler med midler til undertrykkelse af uoenskede fejlsignaler

Info

Publication number
DK491677A
DK491677A DK491677A DK491677A DK491677A DK 491677 A DK491677 A DK 491677A DK 491677 A DK491677 A DK 491677A DK 491677 A DK491677 A DK 491677A DK 491677 A DK491677 A DK 491677A
Authority
DK
Denmark
Prior art keywords
signals
suppressing unwanted
amplifier coupling
unwanted error
acoustic signals
Prior art date
Application number
DK491677A
Other languages
Danish (da)
English (en)
Inventor
D J H Admiraal
B L Cardozo
Original Assignee
Philips Nv
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 Philips Nv filed Critical Philips Nv
Publication of DK491677A publication Critical patent/DK491677A/da

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/32—Automatic control in amplifiers having semiconductor devices the control being dependent upon ambient noise level or sound level
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/45—Prevention of acoustic reaction, i.e. acoustic oscillatory feedback
    • H04R25/453—Prevention of acoustic reaction, i.e. acoustic oscillatory feedback electronically

Landscapes

  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Neurosurgery (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Control Of Amplification And Gain Control (AREA)
  • Amplifiers (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
DK491677A 1976-11-08 1977-11-04 Forstaerkerkobling for akustiske signaler med midler til undertrykkelse af uoenskede fejlsignaler DK491677A (da)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7612358A NL7612358A (nl) 1976-11-08 1976-11-08 Versterkerinrichting voor akoestische signalen voorzien van middelen voor het onderdrukken van ongewenste stoorsignalen.

Publications (1)

Publication Number Publication Date
DK491677A true DK491677A (da) 1978-05-09

Family

ID=19827181

Family Applications (1)

Application Number Title Priority Date Filing Date
DK491677A DK491677A (da) 1976-11-08 1977-11-04 Forstaerkerkobling for akustiske signaler med midler til undertrykkelse af uoenskede fejlsignaler

Country Status (10)

Country Link
US (2) US4525856A (it)
JP (1) JPS6051810B2 (it)
AT (1) AT362834B (it)
CA (1) CA1107355A (it)
DE (1) DE2747821C2 (it)
DK (1) DK491677A (it)
FR (1) FR2370376A1 (it)
GB (1) GB1545445A (it)
IT (1) IT1091946B (it)
NL (1) NL7612358A (it)

Families Citing this family (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0065335B1 (fr) * 1981-05-08 1984-12-27 Telecommunications Radioelectriques Et Telephoniques T.R.T. Dispositif destiné à éviter des oscillations entretenues gênantes dans un système bouclé et poste téléphonique à haut-parleur utilisant ce dispositif
FR2505587A1 (fr) * 1981-05-08 1982-11-12 Trt Telecom Radio Electr Dispositif destine a eviter des oscillations entretenues genantes dans un systeme boucle
FR2507848B1 (fr) * 1981-06-11 1987-09-25 Telephonie Ind Commerciale Procede de suppression d'oscillations entretenues par effet larsen et poste telephonique a circuit suppresseur appliquant ce procede
US4736432A (en) * 1985-12-09 1988-04-05 Motorola Inc. Electronic siren audio notch filter for transmitters
NL8600405A (nl) * 1986-02-18 1987-09-16 Philips Nv Versterker met automatische regeling van de versterking.
US4879749A (en) * 1986-06-26 1989-11-07 Audimax, Inc. Host controller for programmable digital hearing aid system
US4759065A (en) * 1986-09-22 1988-07-19 Harman International Industries, Incorporated Automotive sound system
ATE69132T1 (de) * 1987-02-17 1991-11-15 Siemens Ag Schaltungsanordnung zum erkennen von schwingungen.
EP0280907B1 (de) * 1987-02-17 1991-10-09 Siemens Audiologische Technik GmbH Schaltungsanordnung zum Unterdrücken von Schwingungen
US5225836A (en) * 1988-03-23 1993-07-06 Central Institute For The Deaf Electronic filters, repeated signal charge conversion apparatus, hearing aids and methods
US5016280A (en) * 1988-03-23 1991-05-14 Central Institute For The Deaf Electronic filters, hearing aids and methods
JPH02155398A (ja) * 1988-12-07 1990-06-14 Biiba Kk ハウリング防止装置
US5187741A (en) * 1990-11-30 1993-02-16 At&T Bell Laboratories Enhanced acoustic calibration procedure for a voice switched speakerphone
US5305307A (en) * 1991-01-04 1994-04-19 Picturetel Corporation Adaptive acoustic echo canceller having means for reducing or eliminating echo in a plurality of signal bandwidths
US5263019A (en) * 1991-01-04 1993-11-16 Picturetel Corporation Method and apparatus for estimating the level of acoustic feedback between a loudspeaker and microphone
DE4328798C2 (de) * 1993-08-27 1997-01-16 Blaupunkt Werke Gmbh Verfahren und Einrichtung zum Anpassen der Lautstärke eines mobilen Wiedergabegerätes an das Umgebungsgeräusch
US5412734A (en) * 1993-09-13 1995-05-02 Thomasson; Samuel L. Apparatus and method for reducing acoustic feedback
US5493620A (en) * 1993-12-20 1996-02-20 Pulfrey; Robert E. High fidelity sound reproducing system
US6252967B1 (en) * 1999-01-21 2001-06-26 Acoustic Technologies, Inc. Reducing acoustic feedback with digital modulation
DE10228826A1 (de) * 2002-06-27 2004-01-29 Siemens Audiologische Technik Gmbh Akustikmodul für ein Hörhilfsgerät
US7627129B2 (en) * 2002-11-21 2009-12-01 Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. Apparatus and method for suppressing feedback
US9236837B2 (en) 2011-08-25 2016-01-12 Infineon Technologies Ag System and method for low distortion capacitive signal source amplifier
US8638249B2 (en) 2012-04-16 2014-01-28 Infineon Technologies Ag System and method for high input capacitive signal amplifier
EP3185588A1 (en) * 2015-12-22 2017-06-28 Oticon A/s A hearing device comprising a feedback detector
US10530936B1 (en) 2019-03-15 2020-01-07 Motorola Solutions, Inc. Method and system for acoustic feedback cancellation using a known full band sequence

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3405237A (en) * 1965-06-01 1968-10-08 Bell Telephone Labor Inc Apparatus for determining the periodicity and aperiodicity of a complex wave
GB1228795A (it) * 1967-05-31 1971-04-21
US3920931A (en) * 1974-09-25 1975-11-18 Jr Paul Yanick Hearing aid amplifiers employing selective gain control circuits
US4079199A (en) * 1977-05-25 1978-03-14 Patronis Jr Eugene T Acoustic feedback detector and automatic gain control

Also Published As

Publication number Publication date
DE2747821A1 (de) 1978-05-11
ATA792177A (de) 1980-11-15
NL7612358A (nl) 1978-05-10
JPS5358704A (en) 1978-05-26
AT362834B (de) 1981-06-25
FR2370376B1 (it) 1983-03-25
IT1091946B (it) 1985-07-06
CA1107355A (en) 1981-08-18
GB1545445A (en) 1979-05-10
US4747144A (en) 1988-05-24
DE2747821C2 (de) 1986-11-27
US4525856A (en) 1985-06-25
FR2370376A1 (fr) 1978-06-02
JPS6051810B2 (ja) 1985-11-15

Similar Documents

Publication Publication Date Title
DK491677A (da) Forstaerkerkobling for akustiske signaler med midler til undertrykkelse af uoenskede fejlsignaler
DK492777A (da) Fremgangsmaade til bestemmelse af mikroorganismer
BR7705319A (pt) Decodificador de sinais acusticos digitais
DK572077A (da) Integreret ammoniak-urinstof-producerende fremgangsmaade til fremstilling af urinstof
SE7711113L (sv) Kopplingsanordning for alstrande av en felsignal
DK38178A (da) Forbindelseselement for undersoeiske roerledninger
DK447077A (da) Udstyr til overfoering af kioksignaler
DK436276A (da) Fremgangsmade til overvagning af taktsignalerne i et digitalt anleg
DK109277A (da) Lydgengivelsesanleg
DK288677A (da) Multikanals lydgengivelsesanleg
SE7613724L (sv) Rorforbindning
DK556281A (da) Modforvraenger til modforvraengning af ulineaert forvraengede signaler
DK140611B (da) Apparat til detektering af ekkosignaler.
DK25477A (da) Arrangement til indikering af signaler med en lengde over en grenseverdi
SE7907833L (sv) Transversalfilter for digitala signaler
IT1080558B (it) Trasduttore elettroacustico
NL189484C (nl) Versterker voor pulsbreedtegemoduleerde signalen.
BR7701123A (pt) Aparelho amplificador de sinal
DK73677A (da) Fremgangsmade til fremstilling af quinolinonderivater
DK152638C (da) Automatisk akustisk afproevningssystem
SE405535B (sv) Regenereringsanordning for digitala signaler
DK539577A (da) R fremgangsmaade til fremstilling af heterocycliske forbindelse
SE423773B (sv) Fjerrmatad mellanforsterkare for telekommunikation
AT349177B (de) Rohrverbindung
SE7607628L (sv) Filtermedium for filter

Legal Events

Date Code Title Description
ATS Application withdrawn