DE190099C - - Google Patents
Info
- Publication number
- DE190099C DE190099C DENDAT190099D DE190099DA DE190099C DE 190099 C DE190099 C DE 190099C DE NDAT190099 D DENDAT190099 D DE NDAT190099D DE 190099D A DE190099D A DE 190099DA DE 190099 C DE190099 C DE 190099C
- Authority
- DE
- Germany
- Prior art keywords
- electrode
- felt ring
- microphone
- wadding
- chamber
- 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.)
- Active
Links
- 239000010445 mica Substances 0.000 claims description 7
- 229910052618 mica group Inorganic materials 0.000 claims description 7
- 239000012528 membrane Substances 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 239000003245 coal Substances 0.000 claims description 3
- 239000008187 granular material Substances 0.000 claims description 3
- 229920000742 Cotton Polymers 0.000 description 3
- 239000002184 metal Substances 0.000 description 2
- 241000947840 Alteromonadales Species 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
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)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT369068X | 1906-03-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE190099C true DE190099C (cs) |
Family
ID=5722044
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DENDAT190099D Active DE190099C (cs) | 1906-03-19 |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE190099C (cs) |
| FR (1) | FR369068A (cs) |
-
0
- DE DENDAT190099D patent/DE190099C/de active Active
-
1906
- 1906-08-21 FR FR369068A patent/FR369068A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR369068A (fr) | 1906-12-28 |
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