DE4021787C2 - - Google Patents
Info
- Publication number
- DE4021787C2 DE4021787C2 DE19904021787 DE4021787A DE4021787C2 DE 4021787 C2 DE4021787 C2 DE 4021787C2 DE 19904021787 DE19904021787 DE 19904021787 DE 4021787 A DE4021787 A DE 4021787A DE 4021787 C2 DE4021787 C2 DE 4021787C2
- Authority
- DE
- Germany
- Prior art keywords
- electro
- frequency
- acoustic
- acoustic system
- modulators
- 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 - Lifetime
Links
- 230000000903 blocking effect Effects 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 5
- 230000000737 periodic effect Effects 0.000 claims description 5
- 238000002592 echocardiography Methods 0.000 claims description 4
- 230000001419 dependent effect Effects 0.000 claims description 2
- 230000008878 coupling Effects 0.000 description 6
- 238000010168 coupling process Methods 0.000 description 6
- 238000005859 coupling reaction Methods 0.000 description 6
- 230000001629 suppression Effects 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000003321 amplification Effects 0.000 description 3
- 238000013016 damping Methods 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 230000008713 feedback mechanism Effects 0.000 description 1
- 210000004072 lung Anatomy 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000036962 time dependent Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
- H04M9/087—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic using different frequency bands for transmitting and receiving paths ; using phase shifting arrangements
-
- 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
- H04R3/02—Circuits for transducers, loudspeakers or microphones for preventing acoustic reaction, i.e. acoustic oscillatory feedback
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Telephone Function (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4021787A DE4021787A1 (de) | 1990-07-09 | 1990-07-09 | Elektro-akustisches system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4021787A DE4021787A1 (de) | 1990-07-09 | 1990-07-09 | Elektro-akustisches system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DE4021787A1 DE4021787A1 (de) | 1992-01-16 |
| DE4021787C2 true DE4021787C2 (enrdf_load_stackoverflow) | 1992-07-02 |
Family
ID=6409931
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE4021787A Granted DE4021787A1 (de) | 1990-07-09 | 1990-07-09 | Elektro-akustisches system |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE4021787A1 (enrdf_load_stackoverflow) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2742953B1 (fr) * | 1995-12-22 | 1998-01-23 | Sagem | Procede de commande d'un buzzer |
| CN1186965C (zh) * | 2000-08-07 | 2005-01-26 | 松下电器产业株式会社 | 扬声器装置 |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1662876A (en) * | 1925-12-24 | 1928-03-20 | Assigitoe | |
| DE879561C (de) * | 1951-09-26 | 1953-06-15 | Siemens Ag | Schaltungsanordnung fuer elektroakustische UEbertragungsanlagen, insbesondere Gegensprechanlagen |
| DE3118473C2 (de) * | 1981-05-09 | 1987-02-05 | Felten & Guilleaume Fernmeldeanlagen GmbH, 8500 Nürnberg | Verfahren zur Aufbereitung elektrischer Signale mit einer digitalen Filteranordnung |
| DE3431141A1 (de) * | 1984-08-24 | 1986-03-06 | Siemens Ag | Transversalfilter-echokompensator fuer lange akustische echos |
| DE3510352C1 (de) * | 1985-03-22 | 1986-09-11 | ANT Nachrichtentechnik GmbH, 7150 Backnang | Gegensprech-Übertragungseinrichtung |
| US4641339A (en) * | 1985-03-27 | 1987-02-03 | Itt Corporation | Variable bandwidth handsfree telephone using switched capacitor filtering |
| DE3706540A1 (de) * | 1986-03-03 | 1987-09-10 | Head Stereo Gmbh | Einrichtung zur verbesserung der rueckhoerdaempfung bzw. schleifenverstaerkung bei gegensprecheinrichtungen |
| DE3728109C1 (de) * | 1987-08-22 | 1989-03-16 | Telefonbau & Normalzeit Gmbh | Verfahren fuer die sprachgesteuerte Daempfungsregelung in Fernsprechuebertragungskreisen |
-
1990
- 1990-07-09 DE DE4021787A patent/DE4021787A1/de active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| DE4021787A1 (de) | 1992-01-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| OP8 | Request for examination as to paragraph 44 patent law | ||
| D2 | Grant after examination | ||
| 8364 | No opposition during term of opposition | ||
| 8327 | Change in the person/name/address of the patent owner |
Owner name: TEMIC TELEFUNKEN MICROELECTRONIC GMBH, 7100 HEILBR |
|
| 8320 | Willingness to grant licenses declared (paragraph 23) | ||
| 8339 | Ceased/non-payment of the annual fee |