FR659778A - Perfectionnements aux microphones - Google Patents
Perfectionnements aux microphonesInfo
- Publication number
- FR659778A FR659778A FR659778DA FR659778A FR 659778 A FR659778 A FR 659778A FR 659778D A FR659778D A FR 659778DA FR 659778 A FR659778 A FR 659778A
- Authority
- FR
- France
- Prior art keywords
- refinements
- microphone
- microphone refinements
- 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
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R21/00—Variable-resistance transducers
- H04R21/02—Microphones
- H04R21/023—Microphones with more than one granular chamber
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB22762/27A GB301441A (en) | 1927-08-30 | 1927-08-30 | Improvements in or relating to microphones |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR659778A true FR659778A (fr) | 1929-07-03 |
Family
ID=10184662
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR659778D Expired FR659778A (fr) | 1927-08-30 | 1928-08-30 | Perfectionnements aux microphones |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US1768211A (fr) |
| FR (1) | FR659778A (fr) |
| GB (1) | GB301441A (fr) |
-
1927
- 1927-08-30 GB GB22762/27A patent/GB301441A/en not_active Expired
-
1928
- 1928-08-28 US US302615A patent/US1768211A/en not_active Expired - Lifetime
- 1928-08-30 FR FR659778D patent/FR659778A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB301441A (en) | 1928-11-30 |
| US1768211A (en) | 1930-06-24 |
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