BE877077R - Systemes d'intercommunication a haut-parleur - Google Patents
Systemes d'intercommunication a haut-parleurInfo
- Publication number
- BE877077R BE877077R BE2/57881A BE2057881A BE877077R BE 877077 R BE877077 R BE 877077R BE 2/57881 A BE2/57881 A BE 2/57881A BE 2057881 A BE2057881 A BE 2057881A BE 877077 R BE877077 R BE 877077R
- Authority
- BE
- Belgium
- Prior art keywords
- speaker
- intercommunication systems
- intercommunication
- systems
- speaker intercommunication
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Telephone Function (AREA)
- Circuit For Audible Band Transducer (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19782826671 DE2826671C3 (de) | 1978-06-19 | 1978-06-19 | Schaltungsanordnung für einen Fernsprechapparat mit einer Freisprecheinrichtung |
Publications (1)
Publication Number | Publication Date |
---|---|
BE877077R true BE877077R (fr) | 1979-12-19 |
Family
ID=6042078
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
BE2/57881A BE877077R (fr) | 1978-06-19 | 1979-06-19 | Systemes d'intercommunication a haut-parleur |
Country Status (3)
Country | Link |
---|---|
AT (1) | AT373111B (fr) |
BE (1) | BE877077R (fr) |
DE (1) | DE2826671C3 (fr) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4536888A (en) * | 1981-08-21 | 1985-08-20 | Plantronics, Inc. | Voice communication instrument system with line-powered receiver conditioning circuit |
US4497980A (en) * | 1983-06-16 | 1985-02-05 | Itt Corporation | Handsfree circuit for telephone instrument |
GB8317706D0 (en) * | 1983-06-29 | 1983-08-03 | Standard Telephones Cables Ltd | Telephone subsets |
DE3407203A1 (de) * | 1984-02-28 | 1985-08-29 | Siemens AG, 1000 Berlin und 8000 München | Fernsprechstation mit freisprechen |
DE3616314A1 (de) * | 1986-05-13 | 1987-11-19 | Krone Ag | Fernsprechapparat mit freisprecheinrichtung |
-
1978
- 1978-06-19 DE DE19782826671 patent/DE2826671C3/de not_active Expired
-
1979
- 1979-06-18 AT AT427879A patent/AT373111B/de not_active IP Right Cessation
- 1979-06-19 BE BE2/57881A patent/BE877077R/fr active
Also Published As
Publication number | Publication date |
---|---|
ATA427879A (de) | 1983-04-15 |
DE2826671A1 (de) | 1979-12-20 |
DE2826671C3 (de) | 1981-08-06 |
AT373111B (de) | 1983-12-27 |
DE2826671B2 (de) | 1980-10-30 |
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