NL247967A - - Google Patents
Info
- Publication number
- NL247967A NL247967A NL247967DA NL247967A NL 247967 A NL247967 A NL 247967A NL 247967D A NL247967D A NL 247967DA NL 247967 A NL247967 A NL 247967A
- Authority
- NL
- Netherlands
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
- H04M1/6033—Substation equipment, e.g. for use by subscribers including speech amplifiers for providing handsfree use or a loudspeaker mode in telephone sets
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR785584A FR1227286A (fr) | 1959-02-02 | 1959-02-02 | Amplificateur duplex et son adaptation sur ligne de réseau téléphonique public |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL247967A true NL247967A (en:Method) |
Family
ID=8710760
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL247967D NL247967A (en:Method) | 1959-02-02 |
Country Status (4)
| Country | Link |
|---|---|
| BE (1) | BE587075A (en:Method) |
| DE (1) | DE1132598B (en:Method) |
| FR (1) | FR1227286A (en:Method) |
| NL (1) | NL247967A (en:Method) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE882420C (de) * | 1938-04-12 | 1953-07-09 | Siemens Ag | Schaltungsanordnung fuer Rueckkopplungssperren in Lautfernsprechanlagen |
| BE560458A (en:Method) * | 1954-02-08 |
-
0
- NL NL247967D patent/NL247967A/xx unknown
-
1959
- 1959-02-02 FR FR785584A patent/FR1227286A/fr not_active Expired
-
1960
- 1960-01-28 BE BE587075A patent/BE587075A/fr unknown
- 1960-02-01 DE DES66877A patent/DE1132598B/de active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| BE587075A (fr) | 1960-05-16 |
| FR1227286A (fr) | 1960-08-19 |
| DE1132598B (de) | 1962-07-05 |