NL82970C - - Google Patents
Info
- Publication number
- NL82970C NL82970C NL82970DA NL82970C NL 82970 C NL82970 C NL 82970C NL 82970D A NL82970D A NL 82970DA NL 82970 C NL82970 C NL 82970C
- Authority
- NL
- Netherlands
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/58—Anti-side-tone circuits
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/738—Interface circuits for coupling substations to external telephone lines
- H04M1/76—Compensating for differences in line impedance
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Telephonic Communication Services (AREA)
- Interface Circuits In Exchanges (AREA)
- Devices For Supply Of Signal Current (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US202887A US2629783A (en) | 1950-12-27 | 1950-12-27 | Telephone circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL82970C true NL82970C (US07714131-20100511-C00038.png) |
Family
ID=22751632
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL82970D NL82970C (US07714131-20100511-C00038.png) | 1950-12-27 |
Country Status (6)
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE510745A (US07714131-20100511-C00038.png) * | 1951-04-18 | |||
| DE1002399B (de) * | 1955-12-30 | 1957-02-14 | Siemens Ag | Schaltungsanordnung zur selbsttaetigen Regelung der Rueckhoerdaempfung von Fernsprechstationen |
| US3020351A (en) * | 1957-03-20 | 1962-02-06 | Gen Dynamics Corp | Directional coupling network |
| US3130274A (en) * | 1960-10-20 | 1964-04-21 | Itt | 2-or 4-wire telephone set |
| GB1164931A (en) * | 1967-01-04 | 1969-09-24 | Standard Telephones Cables Ltd | Automatic Regulation of Telephone Sets. |
| US3517138A (en) * | 1967-09-25 | 1970-06-23 | Automatic Elect Lab | Long loop anti-side-tone telephone circuit |
| US4132863A (en) * | 1977-12-20 | 1979-01-02 | Bell Telephone Laboratories, Incorporated | Automatic gain and return loss compensating line circuit |
| US4216356A (en) * | 1979-02-21 | 1980-08-05 | Bell Telephone Laboratories, Incorporated | Telephone having separate voice and signaling pairs |
| US5471527A (en) * | 1993-12-02 | 1995-11-28 | Dsc Communications Corporation | Voice enhancement system and method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2287998A (en) * | 1939-06-10 | 1942-06-30 | Bell Telephone Labor Inc | Telephone circuit |
| US2288049A (en) * | 1939-06-10 | 1942-06-30 | Bell Telephone Labor Inc | Telephone set circuit |
| NL64921C (US07714131-20100511-C00038.png) * | 1942-10-24 |
-
0
- NL NL82970D patent/NL82970C/xx active
- BE BE505815D patent/BE505815A/xx unknown
-
1950
- 1950-12-27 US US202887A patent/US2629783A/en not_active Expired - Lifetime
-
1951
- 1951-06-12 FR FR1109009D patent/FR1109009A/fr not_active Expired
- 1951-09-28 CH CH304196D patent/CH304196A/de unknown
- 1951-12-18 GB GB29632/51A patent/GB694705A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CH304196A (de) | 1954-12-31 |
| US2629783A (en) | 1953-02-24 |
| BE505815A (US07714131-20100511-C00038.png) | |
| GB694705A (en) | 1953-07-22 |
| FR1109009A (fr) | 1956-01-20 |
