FR653933A - Microphone à charbon - Google Patents
Microphone à charbonInfo
- Publication number
- FR653933A FR653933A FR653933DA FR653933A FR 653933 A FR653933 A FR 653933A FR 653933D A FR653933D A FR 653933DA FR 653933 A FR653933 A FR 653933A
- Authority
- FR
- France
- Prior art keywords
- charcoal
- microphone
- charcoal microphone
- 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; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R21/00—Variable-resistance transducers
- H04R21/02—Microphones
- H04R21/021—Microphones with granular resistance material
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 |
---|---|---|---|
DE290167X | 1927-05-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR653933A true FR653933A (fr) | 1929-03-29 |
Family
ID=6060767
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR653933D Expired FR653933A (fr) | 1927-05-07 | 1928-05-07 | Microphone à charbon |
Country Status (2)
Country | Link |
---|---|
FR (1) | FR653933A (fr) |
GB (1) | GB290167A (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3103559A (en) * | 1960-06-24 | 1963-09-10 | Waterproof electrostrictive inertial type microphone |
-
1928
- 1928-05-05 GB GB13338/28A patent/GB290167A/en not_active Expired
- 1928-05-07 FR FR653933D patent/FR653933A/fr not_active Expired
Also Published As
Publication number | Publication date |
---|---|
GB290167A (en) | 1929-10-07 |
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