FR942753A - Système téléphonique - Google Patents
Système téléphoniqueInfo
- Publication number
- FR942753A FR942753A FR942753DA FR942753A FR 942753 A FR942753 A FR 942753A FR 942753D A FR942753D A FR 942753DA FR 942753 A FR942753 A FR 942753A
- Authority
- FR
- France
- Prior art keywords
- telephone system
- 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
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/58—Anti-side-tone circuits
-
- 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
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/738—Interface circuits for coupling substations to external telephone lines
- H04M1/74—Interface circuits for coupling substations to external telephone lines with means for reducing interference; with means for reducing effects due to line faults
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US485268A US2396175A (en) | 1943-05-01 | 1943-05-01 | Transmission system |
Publications (1)
Publication Number | Publication Date |
---|---|
FR942753A true FR942753A (fr) | 1949-02-17 |
Family
ID=23927516
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR942753D Expired FR942753A (fr) | 1943-05-01 | 1947-03-07 | Système téléphonique |
Country Status (2)
Country | Link |
---|---|
US (1) | US2396175A (fr) |
FR (1) | FR942753A (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2472211A (en) * | 1945-12-13 | 1949-06-07 | Automatic Elect Lab | Antisinging gain controlled repeater |
-
1943
- 1943-05-01 US US485268A patent/US2396175A/en not_active Expired - Lifetime
-
1947
- 1947-03-07 FR FR942753D patent/FR942753A/fr not_active Expired
Also Published As
Publication number | Publication date |
---|---|
US2396175A (en) | 1946-03-05 |
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