DE186620C - - Google Patents
Info
- Publication number
- DE186620C DE186620C DENDAT186620D DE186620DA DE186620C DE 186620 C DE186620 C DE 186620C DE NDAT186620 D DENDAT186620 D DE NDAT186620D DE 186620D A DE186620D A DE 186620DA DE 186620 C DE186620 C DE 186620C
- Authority
- DE
- Germany
- Prior art keywords
- grain
- chamber
- microphone
- wall
- glass wool
- 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
- 239000011491 glass wool Substances 0.000 claims description 8
- 230000000694 effects Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000012528 membrane Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 3
- 239000010445 mica Substances 0.000 description 2
- 229910052618 mica group Inorganic materials 0.000 description 2
- 239000011490 mineral wool Substances 0.000 description 2
- 210000002268 wool Anatomy 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000002925 chemical effect Effects 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 238000004870 electrical engineering Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000035945 sensitivity Effects 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)
- Piezo-Electric Transducers For Audible Bands (AREA)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE186620C true DE186620C (enrdf_load_stackoverflow) |
Family
ID=450368
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DENDAT186620D Active DE186620C (enrdf_load_stackoverflow) |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE186620C (enrdf_load_stackoverflow) |
-
0
- DE DENDAT186620D patent/DE186620C/de active Active
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