BE478694A - - Google Patents
Info
- Publication number
- BE478694A BE478694A BE478694DA BE478694A BE 478694 A BE478694 A BE 478694A BE 478694D A BE478694D A BE 478694DA BE 478694 A BE478694 A BE 478694A
- Authority
- BE
- Belgium
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response
- H04R3/08—Circuits for transducers, loudspeakers or microphones for correcting frequency response of electromagnetic transducers
-
- 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
-
- 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)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Acoustics & Sound (AREA)
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2606252X | 1945-03-29 | ||
| GB8031/45A GB597170A (en) | 1945-03-29 | 1947-08-08 | Improvements in loud-speaking telephone arrangements |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE478694A true BE478694A (forum.php) | 1948-06-24 |
Family
ID=32232360
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE478694D BE478694A (forum.php) | 1945-03-29 | 1947-12-24 |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US2606252A (forum.php) |
| BE (1) | BE478694A (forum.php) |
| CH (1) | CH266245A (forum.php) |
| DE (1) | DE828710C (forum.php) |
| FR (1) | FR1015515A (forum.php) |
| GB (1) | GB597170A (forum.php) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2606252A (en) * | 1945-03-29 | 1952-08-05 | Hartford Nat Bank & Trust Co | Loud-speaking telephone arrangement |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2205142A (en) * | 1937-02-03 | 1940-06-18 | Holtzer Cabot Electric Co | Loudspeaking telephone system |
| GB508031A (en) * | 1937-12-23 | 1939-06-23 | Automatic Telephone & Elect | Improvements in or relating to telephone systems |
| US2199220A (en) * | 1939-07-18 | 1940-04-30 | French Hubert | Interstation communication system |
| US2264311A (en) * | 1939-08-14 | 1941-12-02 | Associated Electric Lab Inc | Transmission system |
| NL66226C (forum.php) * | 1942-03-12 | |||
| US2606252A (en) * | 1945-03-29 | 1952-08-05 | Hartford Nat Bank & Trust Co | Loud-speaking telephone arrangement |
-
1947
- 1947-08-08 US US767547A patent/US2606252A/en not_active Expired - Lifetime
- 1947-08-08 GB GB8031/45A patent/GB597170A/en not_active Expired
- 1947-12-12 CH CH266245D patent/CH266245A/de unknown
- 1947-12-24 BE BE478694D patent/BE478694A/xx unknown
- 1947-12-29 FR FR1015515D patent/FR1015515A/fr not_active Expired
-
1948
- 1948-12-24 DE DEP26631D patent/DE828710C/de not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US2606252A (en) | 1952-08-05 |
| CH266245A (de) | 1950-01-15 |
| FR1015515A (fr) | 1952-10-28 |
| GB597170A (en) | 1948-01-20 |
| DE828710C (de) | 1952-01-21 |