FR1105792A - Loudspeaker telephone system - Google Patents
Loudspeaker telephone systemInfo
- Publication number
- FR1105792A FR1105792A FR1105792DA FR1105792A FR 1105792 A FR1105792 A FR 1105792A FR 1105792D A FR1105792D A FR 1105792DA FR 1105792 A FR1105792 A FR 1105792A
- Authority
- FR
- France
- Prior art keywords
- telephone system
- loudspeaker telephone
- loudspeaker
- telephone
- 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
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
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1105792T | 1954-07-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR1105792A true FR1105792A (en) | 1955-12-07 |
Family
ID=9623625
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR1105792D Expired FR1105792A (en) | 1954-07-29 | 1954-07-29 | Loudspeaker telephone system |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR1105792A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2536615A1 (en) * | 1982-11-18 | 1984-05-25 | Western Electric Co | VOICE SWITCHING DEVICE FOR TELEPHONE CONFERENCE SYSTEM |
-
1954
- 1954-07-29 FR FR1105792D patent/FR1105792A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2536615A1 (en) * | 1982-11-18 | 1984-05-25 | Western Electric Co | VOICE SWITCHING DEVICE FOR TELEPHONE CONFERENCE SYSTEM |
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