BE485054A - - Google Patents
Info
- Publication number
- BE485054A BE485054A BE485054DA BE485054A BE 485054 A BE485054 A BE 485054A BE 485054D A BE485054D A BE 485054DA BE 485054 A BE485054 A BE 485054A
- 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
- H04R3/02—Circuits for transducers, loudspeakers or microphones for preventing acoustic reaction, i.e. acoustic oscillatory feedback
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT269948X | 1947-10-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE485054A true BE485054A (fr) |
Family
ID=11220725
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE485054D BE485054A (fr) | 1947-10-02 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US2535903A (fr) |
| BE (1) | BE485054A (fr) |
| CH (1) | CH269948A (fr) |
| FR (1) | FR972601A (fr) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US751829A (en) * | 1904-02-09 | billift | ||
| US551347A (en) * | 1895-12-10 | bbown | ||
| US2417067A (en) * | 1947-03-11 | Telephone substation circuit | ||
| US235658A (en) * | 1880-12-21 | Relay-telephone | ||
| US530516A (en) * | 1894-12-11 | Suppression of self-inductive obstruction in electromagnetic apparatus | ||
| US322727A (en) * | 1885-07-21 | William a | ||
| US1254473A (en) * | 1916-09-09 | 1918-01-22 | American Telephone & Telegraph | Signaling-circuit. |
-
0
- BE BE485054D patent/BE485054A/xx unknown
-
1948
- 1948-09-27 CH CH269948D patent/CH269948A/de unknown
- 1948-09-27 US US51403A patent/US2535903A/en not_active Expired - Lifetime
- 1948-10-01 FR FR972601D patent/FR972601A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR972601A (fr) | 1951-02-01 |
| US2535903A (en) | 1950-12-26 |
| CH269948A (de) | 1950-07-31 |