NL8203010A - Schakeling voor een luidsprekende telefooninrichting. - Google Patents
Schakeling voor een luidsprekende telefooninrichting. Download PDFInfo
- Publication number
- NL8203010A NL8203010A NL8203010A NL8203010A NL8203010A NL 8203010 A NL8203010 A NL 8203010A NL 8203010 A NL8203010 A NL 8203010A NL 8203010 A NL8203010 A NL 8203010A NL 8203010 A NL8203010 A NL 8203010A
- Authority
- NL
- Netherlands
- Prior art keywords
- amplifier
- circuit
- circuit according
- signal
- transmission
- Prior art date
Links
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
- H04M9/10—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic with switching of direction of transmission by voice frequency
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Circuit For Audible Band Transducer (AREA)
- Telephone Function (AREA)
- Telephone Set Structure (AREA)
- Mobile Radio Communication Systems (AREA)
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
- Amplifiers (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3148305 | 1981-12-03 | ||
DE19813148305 DE3148305A1 (de) | 1981-12-03 | 1981-12-03 | Schaltungsanordnung fuer eine freisprecheinrichtung |
Publications (1)
Publication Number | Publication Date |
---|---|
NL8203010A true NL8203010A (nl) | 1983-07-01 |
Family
ID=6148050
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NL8203010A NL8203010A (nl) | 1981-12-03 | 1982-07-27 | Schakeling voor een luidsprekende telefooninrichting. |
Country Status (10)
Country | Link |
---|---|
BE (1) | BE894144A (ja) |
DE (1) | DE3148305A1 (ja) |
DK (1) | DK534682A (ja) |
FR (1) | FR2517911B1 (ja) |
GB (1) | GB2110905B (ja) |
GR (1) | GR77765B (ja) |
IE (1) | IE53672B1 (ja) |
IT (1) | IT1154586B (ja) |
LU (1) | LU84322A1 (ja) |
NL (1) | NL8203010A (ja) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3211184C2 (de) * | 1981-03-31 | 1985-12-12 | A. Grothe & Söhne KG, 5000 Köln | Schaltungsanordnung für ein Freisprechtelefon |
DE3301498A1 (de) * | 1983-01-14 | 1984-07-19 | Deutsche Telephonwerke Und Kabelindustrie Ag, 1000 Berlin | Teilnehmersprechstellen-einrichtung fuer fernsprechvermittlungssysteme |
DE3509658A1 (de) * | 1985-03-18 | 1986-09-18 | Drägerwerk AG, 2400 Lübeck | Kommunikationseinheit fuer eine hoer-/sprecheinrichtung |
FR2611408B1 (fr) * | 1987-02-27 | 1989-05-26 | Radiotechnique Compelec | Circuit de commande d e gain d'un amplificateur d'ecoute par haut-parleur pour la suppression de l'effet larsen |
WO1990004897A1 (en) * | 1988-10-26 | 1990-05-03 | Reptec Hb | Telephone plant |
DE4012175C2 (de) * | 1990-04-14 | 1995-04-13 | Telefunken Microelectron | Freisprecheinrichtung |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2120558A5 (ja) * | 1971-01-08 | 1972-08-18 | Brault Andre | |
SE365375B (ja) * | 1972-12-18 | 1974-03-18 | Ericsson Telefon Ab L M | |
DE2439740C3 (de) * | 1974-08-19 | 1978-08-24 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Schaltungsanordnung für sprachgesteuerte Freisprechgeräte mit von den Sprechspannungen abhängigem unterschiedlichen Dämpfungshub je Sprachkanal und je Sprechrichtung |
DE2710816C3 (de) * | 1977-03-11 | 1980-01-10 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Schaltungsanordnung für eine Lautfernsprechstation |
DE2714132C3 (de) * | 1977-03-30 | 1980-02-07 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Schaltungsanordnung für ein sprachgesteuertes Lautfernsprechgerät |
-
1981
- 1981-12-03 DE DE19813148305 patent/DE3148305A1/de active Granted
-
1982
- 1982-07-27 NL NL8203010A patent/NL8203010A/nl not_active Application Discontinuation
- 1982-08-06 LU LU84322A patent/LU84322A1/de unknown
- 1982-08-19 BE BE0/208839A patent/BE894144A/fr not_active IP Right Cessation
- 1982-10-26 GB GB08230509A patent/GB2110905B/en not_active Expired
- 1982-10-27 IE IE2583/82A patent/IE53672B1/en unknown
- 1982-11-24 IT IT24414/82A patent/IT1154586B/it active
- 1982-12-01 GR GR69943A patent/GR77765B/el unknown
- 1982-12-02 DK DK534682A patent/DK534682A/da not_active Application Discontinuation
- 1982-12-02 FR FR8220226A patent/FR2517911B1/fr not_active Expired
Also Published As
Publication number | Publication date |
---|---|
GB2110905B (en) | 1985-11-13 |
GR77765B (ja) | 1984-09-25 |
IE53672B1 (en) | 1989-01-04 |
IE822583L (en) | 1983-06-03 |
DK534682A (da) | 1983-06-04 |
IT8224414A0 (it) | 1982-11-24 |
GB2110905A (en) | 1983-06-22 |
FR2517911B1 (fr) | 1986-04-18 |
DE3148305A1 (de) | 1983-06-09 |
FR2517911A1 (fr) | 1983-06-10 |
LU84322A1 (de) | 1983-02-28 |
BE894144A (fr) | 1982-12-16 |
IT1154586B (it) | 1987-01-21 |
DE3148305C2 (ja) | 1988-02-04 |
IT8224414A1 (it) | 1984-05-24 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US5646990A (en) | Efficient speakerphone anti-howling system | |
US5353348A (en) | Double echo cancelling system | |
US6442272B1 (en) | Voice conferencing system having local sound amplification | |
US5612996A (en) | Loop gain processing system for speakerphone applications | |
US5048082A (en) | Voice direction recognition in a digital telephone station | |
US5016271A (en) | Echo canceler-suppressor speakerphone | |
NL8000603A (nl) | Voedingsschakeling voor een abonneelijn. | |
US5381474A (en) | Method of converging an echo canceller | |
US4715062A (en) | Speakerphone control circuit having low gain states and method for controlling gain of speakerphone | |
US4497980A (en) | Handsfree circuit for telephone instrument | |
US4580013A (en) | Handsfree communication apparatus and method | |
NL8203010A (nl) | Schakeling voor een luidsprekende telefooninrichting. | |
US4346261A (en) | Speaker phones | |
US8923508B2 (en) | Half-duplex speakerphone echo canceler | |
US5396550A (en) | Radio and land-line telephones with hands-free operation | |
US5414763A (en) | Apparatus and method for providing echo suppression to a plurality of telephones | |
US5898773A (en) | Telephone apparatus with call transfer function and with improved arrangement for hand-free operation | |
US5033081A (en) | Key telephone system | |
JP2845070B2 (ja) | 電話会議装置 | |
KR930010838B1 (ko) | 통신기기의 마이크 송신레벨 자동제어장치 | |
JP2928135B2 (ja) | ファクシミリ装置 | |
JPH05268121A (ja) | エコー制御方式 | |
JPH07123449A (ja) | 自動利得制御機能付局線トランク | |
JPH02164164A (ja) | 拡声電話装置 | |
JP2004274250A (ja) | 通話装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
A85 | Still pending on 85-01-01 | ||
BV | The patent application has lapsed |