DE2747821C2 - Verstärkeranordnung für akustische Signale mit Mitteln zum Unterdrücken unerwünschter Störsignale - Google Patents
Verstärkeranordnung für akustische Signale mit Mitteln zum Unterdrücken unerwünschter StörsignaleInfo
- Publication number
- DE2747821C2 DE2747821C2 DE2747821A DE2747821A DE2747821C2 DE 2747821 C2 DE2747821 C2 DE 2747821C2 DE 2747821 A DE2747821 A DE 2747821A DE 2747821 A DE2747821 A DE 2747821A DE 2747821 C2 DE2747821 C2 DE 2747821C2
- Authority
- DE
- Germany
- Prior art keywords
- signals
- time
- signal
- periodicity
- arrangement
- 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
Links
- 230000000737 periodic effect Effects 0.000 claims description 11
- 230000001788 irregular Effects 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims 1
- 230000002452 interceptive effect Effects 0.000 claims 1
- 239000003990 capacitor Substances 0.000 description 10
- 230000010355 oscillation Effects 0.000 description 6
- 230000001105 regulatory effect Effects 0.000 description 6
- 230000003321 amplification Effects 0.000 description 2
- 230000005669 field effect Effects 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 235000008694 Humulus lupulus Nutrition 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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)
- Multimedia (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Neurosurgery (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Control Of Amplification And Gain Control (AREA)
- Amplifiers (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
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 (2)
| Publication Number | Publication Date |
|---|---|
| DE2747821A1 DE2747821A1 (de) | 1978-05-11 |
| DE2747821C2 true DE2747821C2 (de) | 1986-11-27 |
Family
ID=19827181
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE2747821A Expired DE2747821C2 (de) | 1976-11-08 | 1977-10-26 | Verstärkeranordnung für akustische Signale mit Mitteln zum Unterdrücken unerwünschter Störsignale |
Country Status (10)
| Country | Link |
|---|---|
| US (2) | US4525856A (Direct) |
| JP (1) | JPS6051810B2 (Direct) |
| AT (1) | AT362834B (Direct) |
| CA (1) | CA1107355A (Direct) |
| DE (1) | DE2747821C2 (Direct) |
| DK (1) | DK491677A (Direct) |
| FR (1) | FR2370376A1 (Direct) |
| GB (1) | GB1545445A (Direct) |
| IT (1) | IT1091946B (Direct) |
| NL (1) | NL7612358A (Direct) |
Families Citing this family (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2505587A1 (fr) * | 1981-05-08 | 1982-11-12 | Trt Telecom Radio Electr | Dispositif destine a eviter des oscillations entretenues genantes dans un systeme boucle |
| DE3261682D1 (en) * | 1981-05-08 | 1985-02-07 | Trt Telecom Radio Electr | Device for avoiding sustained disturbing oscillations in a closed-loop system and loud-speaking telephone apparatus utilising this device |
| 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 |
| US4815140A (en) * | 1987-02-17 | 1989-03-21 | Siemens Aktiengesellschaft | Circuit arrangement for suppressing oscillations |
| EP0280909B1 (de) * | 1987-02-17 | 1991-10-30 | Siemens Aktiengesellschaft | Schaltungsanordnung zum Erkennen von Schwingungen |
| US5016280A (en) * | 1988-03-23 | 1991-05-14 | Central Institute For The Deaf | Electronic filters, hearing aids and methods |
| US5225836A (en) * | 1988-03-23 | 1993-07-06 | Central Institute For The Deaf | Electronic filters, repeated signal charge conversion apparatus, 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 |
| 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 |
| 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 |
| 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)
| 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 (Direct) * | 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 |
-
1976
- 1976-11-08 NL NL7612358A patent/NL7612358A/xx not_active Application Discontinuation
-
1977
- 1977-10-26 DE DE2747821A patent/DE2747821C2/de not_active Expired
- 1977-10-27 CA CA289,662A patent/CA1107355A/en not_active Expired
- 1977-11-04 IT IT69484/77A patent/IT1091946B/it active
- 1977-11-04 GB GB45952/77A patent/GB1545445A/en not_active Expired
- 1977-11-04 DK DK491677A patent/DK491677A/da not_active Application Discontinuation
- 1977-11-05 JP JP52132986A patent/JPS6051810B2/ja not_active Expired
- 1977-11-07 AT AT0792177A patent/AT362834B/de not_active IP Right Cessation
- 1977-11-08 FR FR7733527A patent/FR2370376A1/fr active Granted
-
1979
- 1979-01-24 US US06/006,144 patent/US4525856A/en not_active Expired - Lifetime
-
1985
- 1985-03-20 US US06/713,960 patent/US4747144A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| US4525856A (en) | 1985-06-25 |
| ATA792177A (de) | 1980-11-15 |
| JPS5358704A (en) | 1978-05-26 |
| US4747144A (en) | 1988-05-24 |
| CA1107355A (en) | 1981-08-18 |
| GB1545445A (en) | 1979-05-10 |
| JPS6051810B2 (ja) | 1985-11-15 |
| DE2747821A1 (de) | 1978-05-11 |
| DK491677A (da) | 1978-05-09 |
| NL7612358A (nl) | 1978-05-10 |
| FR2370376A1 (fr) | 1978-06-02 |
| FR2370376B1 (Direct) | 1983-03-25 |
| AT362834B (de) | 1981-06-25 |
| IT1091946B (it) | 1985-07-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 8110 | Request for examination paragraph 44 | ||
| D2 | Grant after examination | ||
| 8363 | Opposition against the patent | ||
| 8365 | Fully valid after opposition proceedings | ||
| 8380 | Miscellaneous part iii |
Free format text: SPALTE 1, ZEILE 10 NACH DEM WORT "DASS" EINFUEGEN: "ZUM UNTERDRUECKEN VON DURCH AKUSTISCHE RUECKKOPPLUNG ERZEUGTEN STOERSIGNALEN" |
|
| 8339 | Ceased/non-payment of the annual fee |